Denes Matetelki
13 years ago
parent
567e96ae7b
commit
f46d548a9e
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@ -0,0 +1,31 @@
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#!/usr/bin/gnuplot
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#input
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set datafile separator ";"
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#output
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set key top left
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# set style data lines
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set grid
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set xlabel 'X'
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set yrange [0:0.383]
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set ylabel 'Y'
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set xrange [-4:4]
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set terminal png transparent nocrop medium size 200,200
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set output '1d_gauss.png'
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plot \
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'-' using 1:($2) title '1D discrete gaussian filter' axes x1y1 lt rgb 'blue' lw 2
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-4;0
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-3;0.006
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-2;0.061
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-1;0.242
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0;0.383
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1;0.242
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2;0.061
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3;0.006
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4;0
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e
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@ -0,0 +1,66 @@
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#!/usr/bin/gnuplot
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#input
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set datafile separator ";"
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#output
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set key top left
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set style data lines
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set grid
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set xlabel 'Number of threads'
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set yrange [0:0.53]
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set ylabel 'Executions time [s]'
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set terminal png transparent nocrop medium size 800,400
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set output 'convolution.png'
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plot \
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'-' using 1:($2) title 'Serial' axes x1y1 lt rgb 'black' lw 2, \
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'-' using 1:($2) title 'Serial - optimized' axes x1y1 lt rgb 'red' lw 2, \
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'-' using 1:($2) title 'intel TBB' axes x1y1 lt rgb 'dark-blue' lw 2, \
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'-' using 1:($2) title 'intel TBB - optimized' axes x1y1 lt rgb 'dark-green' lw 2
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1;0.33
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2;0.33
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3;0.33
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4;0.33
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5;0.33
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6;0.33
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7;0.33
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8;0.33
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9;0.33
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10;0.33
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e
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1;0.25
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2;0.25
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3;0.25
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4;0.25
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5;0.25
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6;0.25
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7;0.25
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8;0.25
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9;0.25
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10;0.25
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e
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1;0.52
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2;0.26
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3;0.27
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4;0.14
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5;0.14
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6;0.13
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7;0.13
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8;0.12
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9;0.13
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10;0.12
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e
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1;0.25
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2;0.125
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3;0.13
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4;0.067
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5;0.067
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6;0.063
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7;0.063
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8;0.0577
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9;0.063
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10;0.0577
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e
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@ -0,0 +1,67 @@
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#!/usr/bin/gnuplot
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#input
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set datafile separator ";"
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#output
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set key top left
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set style data lines
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set grid
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set xlabel 'Number of threads'
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set yrange [0:6.5]
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set ylabel 'Executions time [s]'
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set terminal png transparent nocrop medium size 800,400
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set output 'map.png'
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plot \
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'-' using 1:($2) title 'Serial' axes x1y1 lt rgb 'black' lw 2, \
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'-' using 1:($2) title 'openMP' axes x1y1 lt rgb 'red' lw 2, \
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'-' using 1:($2) title 'intel TBB' axes x1y1 lt rgb 'dark-blue' lw 2, \
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'-' using 1:($2) title 'QtConcurrent' axes x1y1 lt rgb 'dark-green' lw 2
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1;0.5
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2;0.67
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3;0.68
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4;0.69
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5;0.68
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6;0.7
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7;0.65
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8;0.72
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9;0.68
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10;0.69
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e
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1;6.12
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2;3.41
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3;2.12
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4;1.61
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5;1.27
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6;1.59
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7;1.17
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8;1.38
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9;0.97
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10;0.87
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e
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1;6.25
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2;3.45
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3;3.17
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4;1.62
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5;1.6
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6;1.6
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7;1.6
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8;1.51
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9;1.66
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10;1.32
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e
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1;3.22
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2;2.2
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3;1.65
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4;1.32
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5;1.43
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6;1.44
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7;0.95
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8;0.9
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9;0.85
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10;0.8
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e
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@ -0,0 +1,67 @@
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#!/usr/bin/gnuplot
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#input
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set datafile separator ";"
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#output
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set key top left
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set style data lines
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set grid
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set xlabel 'Number of threads'
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set yrange [0:0.8]
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set ylabel 'Executions time [s]'
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set terminal png transparent nocrop medium size 800,400
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set output 'reduce.png'
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plot \
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'-' using 1:($2) title 'Serial' axes x1y1 lt rgb 'black' lw 2, \
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'-' using 1:($2) title 'openMP' axes x1y1 lt rgb 'red' lw 2, \
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'-' using 1:($2) title 'intel TBB' axes x1y1 lt rgb 'dark-blue' lw 2, \
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'-' using 1:($2) title 'QtConcurrent' axes x1y1 lt rgb 'dark-green' lw 2
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1;0.67
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2;0.67
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3;0.61
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4;0.68
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5;0.59
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6;0.7
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7;0.67
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8;0.7
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9;0.65
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10;0.68
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e
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1;0.52
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2;0.27
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3;0.19
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4;0.15
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5;0.15
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6;0.15
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7;0.22
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8;0.2
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9;0.17
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10;0.16
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e
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1;0.68
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2;0.35
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3;0.35
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4;0.18
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5;0.18
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6;0.18
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7;0.19
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8;0.18
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9;0.18
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10;0.15
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e
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1;0.25
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2;0.18
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3;0.15
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4;0.15
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5;0.15
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6;0.17
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7;0.17
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8;0.16
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9;0.17
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10;0.17
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e
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@ -0,0 +1,54 @@
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#!/usr/bin/gnuplot
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#input
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set datafile separator ";"
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#output
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set key top left
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set style data lines
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set grid
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set xlabel 'Number of threads'
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set yrange [0:3.5]
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set ylabel 'Executions time [s]'
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set terminal png transparent nocrop medium size 800,400
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set output 'sort1.png'
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plot \
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'-' using 1:($2) title 'Serial' axes x1y1 lt rgb 'black' lw 2, \
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'-' using 1:($2) title 'openMP' axes x1y1 lt rgb 'red' lw 2, \
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'-' using 1:($2) title 'intel TBB' axes x1y1 lt rgb 'dark-blue' lw 2
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1;2.33
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2;3.39
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3;3.05
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4;3.19
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5;2.98
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6;2.99
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7;3.15
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8;3.24
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9;3.09
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10;2.99
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e
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1;3.04
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2;1.6
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3;1.66
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4;0.84
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5;0.71
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6;0.65
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7;0.7
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8;0.61
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9;0.56
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10;0.51
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e
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||||
1;3.33
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2;1.81
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3;1.32
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4;1.7
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5;1.26
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6;0.89
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7;0.87
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8;0.83
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9;0.81
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10;0.82
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e
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@ -0,0 +1,90 @@
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#!/usr/bin/gnuplot
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||||
#input
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set datafile separator ";"
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#output
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||||
set key top left
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||||
set style data lines
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set grid
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||||
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set xlabel 'Number of threads'
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set yrange [0:18]
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set ylabel 'Executions time [s]'
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set terminal png transparent nocrop medium size 800,400
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set output 'sort2.png'
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plot \
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'-' using 1:($2) title 'Serial' axes x1y1 lt rgb 'black' lw 2, \
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'-' using 1:($2) title 'openMP' axes x1y1 lt rgb 'red' lw 2, \
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'-' using 1:($2) title 'intel TBB' axes x1y1 lt rgb 'dark-blue' lw 2, \
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'-' using 1:($2) title 'cusom openMP threashold' axes x1y1 lt rgb 'steelblue' lw 2, \
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'-' using 1:($2) title 'cusom openMP deep' axes x1y1 lt rgb 'olivedrab' lw 2, \
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'-' using 1:($2) title 'custom QtConcurrent' axes x1y1 lt rgb 'orangered' lw 2
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1;0.29
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2;0.29
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3;0.29
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4;0.29
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5;0.29
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6;0.29
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7;0.29
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8;0.29
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9;0.29
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10;0.29
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||||
e
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||||
1;0.29
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2;0.16
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3;0.11
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4;0.82
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5;0.7
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6;0.59
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7;0.66
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8;0.6
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9;0.56
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10;0.51
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||||
e
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1;0.29
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2;0.18
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3;0.13
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4;0.69
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5;0.94
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6;0.87
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7;0.83
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8;0.8
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9;0.84
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10;0.82
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e
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||||
1;14.32
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2;11.67
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3;6.61
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4;5.69
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5;5.64
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6;4.24
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7;3.71
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8;3.56
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9;3.76
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10;3.18
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e
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||||
1;17.62
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2;8.64
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3;5.92
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4;4.45
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5;4.07
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9;3.05
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10;3.1
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e
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1;17.39
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2;8.91
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3;7.93
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4;5.74
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5;4.64
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6;4.19
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7;3.97
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8;4.68
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9;4.85
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10;4
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e
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@ -0,0 +1,84 @@
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\def\PY@reset{\let\PY@it=\relax \let\PY@bf=\relax%
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\let\PY@ul=\relax \let\PY@tc=\relax%
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\let\PY@bc=\relax \let\PY@ff=\relax}
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\def\PY@tok#1{\csname PY@tok@#1\endcsname}
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\def\PY@toks#1+{\ifx\relax#1\empty\else%
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\PY@tok{#1}\expandafter\PY@toks\fi}
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\def\PY@do#1{\PY@bc{\PY@tc{\PY@ul{%
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\PY@it{\PY@bf{\PY@ff{#1}}}}}}}
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\def\PY#1#2{\PY@reset\PY@toks#1+\relax+\PY@do{#2}}
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\def\PY@tok@gd{\def\PY@tc##1{\textcolor[rgb]{0.63,0.00,0.00}{##1}}}
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\def\PY@tok@gu{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.50,0.00,0.50}{##1}}}
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\def\PY@tok@gt{\def\PY@tc##1{\textcolor[rgb]{0.00,0.25,0.82}{##1}}}
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\def\PY@tok@gs{\let\PY@bf=\textbf}
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\def\PY@tok@gr{\def\PY@tc##1{\textcolor[rgb]{1.00,0.00,0.00}{##1}}}
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\def\PY@tok@cm{\let\PY@it=\textit\def\PY@tc##1{\textcolor[rgb]{0.25,0.50,0.50}{##1}}}
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\def\PY@tok@vg{\def\PY@tc##1{\textcolor[rgb]{0.10,0.09,0.49}{##1}}}
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\def\PY@tok@m{\def\PY@tc##1{\textcolor[rgb]{0.40,0.40,0.40}{##1}}}
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\def\PY@tok@mh{\def\PY@tc##1{\textcolor[rgb]{0.40,0.40,0.40}{##1}}}
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\def\PY@tok@go{\def\PY@tc##1{\textcolor[rgb]{0.50,0.50,0.50}{##1}}}
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\def\PY@tok@ge{\let\PY@it=\textit}
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\def\PY@tok@vc{\def\PY@tc##1{\textcolor[rgb]{0.10,0.09,0.49}{##1}}}
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\def\PY@tok@il{\def\PY@tc##1{\textcolor[rgb]{0.40,0.40,0.40}{##1}}}
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\def\PY@tok@cs{\let\PY@it=\textit\def\PY@tc##1{\textcolor[rgb]{0.25,0.50,0.50}{##1}}}
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\def\PY@tok@cp{\def\PY@tc##1{\textcolor[rgb]{0.74,0.48,0.00}{##1}}}
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\def\PY@tok@gi{\def\PY@tc##1{\textcolor[rgb]{0.00,0.63,0.00}{##1}}}
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\def\PY@tok@gh{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.00,0.50}{##1}}}
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\def\PY@tok@ni{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.60,0.60,0.60}{##1}}}
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\def\PY@tok@nl{\def\PY@tc##1{\textcolor[rgb]{0.63,0.63,0.00}{##1}}}
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\def\PY@tok@nn{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.00,1.00}{##1}}}
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\def\PY@tok@no{\def\PY@tc##1{\textcolor[rgb]{0.53,0.00,0.00}{##1}}}
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\def\PY@tok@na{\def\PY@tc##1{\textcolor[rgb]{0.49,0.56,0.16}{##1}}}
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\def\PY@tok@nb{\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
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\def\PY@tok@nc{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.00,1.00}{##1}}}
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\def\PY@tok@nd{\def\PY@tc##1{\textcolor[rgb]{0.67,0.13,1.00}{##1}}}
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\def\PY@tok@ne{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.82,0.25,0.23}{##1}}}
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\def\PY@tok@nf{\def\PY@tc##1{\textcolor[rgb]{0.00,0.00,1.00}{##1}}}
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\def\PY@tok@si{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.73,0.40,0.53}{##1}}}
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\def\PY@tok@s2{\def\PY@tc##1{\textcolor[rgb]{0.73,0.13,0.13}{##1}}}
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\def\PY@tok@vi{\def\PY@tc##1{\textcolor[rgb]{0.10,0.09,0.49}{##1}}}
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\def\PY@tok@nt{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
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\def\PY@tok@nv{\def\PY@tc##1{\textcolor[rgb]{0.10,0.09,0.49}{##1}}}
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\def\PY@tok@s1{\def\PY@tc##1{\textcolor[rgb]{0.73,0.13,0.13}{##1}}}
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\def\PY@tok@sh{\def\PY@tc##1{\textcolor[rgb]{0.73,0.13,0.13}{##1}}}
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\def\PY@tok@sc{\def\PY@tc##1{\textcolor[rgb]{0.73,0.13,0.13}{##1}}}
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\def\PY@tok@sx{\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
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\def\PY@tok@bp{\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
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\def\PY@tok@c1{\let\PY@it=\textit\def\PY@tc##1{\textcolor[rgb]{0.25,0.50,0.50}{##1}}}
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\def\PY@tok@kc{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
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\def\PY@tok@c{\let\PY@it=\textit\def\PY@tc##1{\textcolor[rgb]{0.25,0.50,0.50}{##1}}}
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\def\PY@tok@mf{\def\PY@tc##1{\textcolor[rgb]{0.40,0.40,0.40}{##1}}}
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\def\PY@tok@err{\def\PY@bc##1{\fcolorbox[rgb]{1.00,0.00,0.00}{1,1,1}{##1}}}
|
||||
\def\PY@tok@kd{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
|
||||
\def\PY@tok@ss{\def\PY@tc##1{\textcolor[rgb]{0.10,0.09,0.49}{##1}}}
|
||||
\def\PY@tok@sr{\def\PY@tc##1{\textcolor[rgb]{0.73,0.40,0.53}{##1}}}
|
||||
\def\PY@tok@mo{\def\PY@tc##1{\textcolor[rgb]{0.40,0.40,0.40}{##1}}}
|
||||
\def\PY@tok@kn{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
|
||||
\def\PY@tok@mi{\def\PY@tc##1{\textcolor[rgb]{0.40,0.40,0.40}{##1}}}
|
||||
\def\PY@tok@gp{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.00,0.50}{##1}}}
|
||||
\def\PY@tok@o{\def\PY@tc##1{\textcolor[rgb]{0.40,0.40,0.40}{##1}}}
|
||||
\def\PY@tok@kr{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
|
||||
\def\PY@tok@s{\def\PY@tc##1{\textcolor[rgb]{0.73,0.13,0.13}{##1}}}
|
||||
\def\PY@tok@kp{\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
|
||||
\def\PY@tok@w{\def\PY@tc##1{\textcolor[rgb]{0.73,0.73,0.73}{##1}}}
|
||||
\def\PY@tok@kt{\def\PY@tc##1{\textcolor[rgb]{0.69,0.00,0.25}{##1}}}
|
||||
\def\PY@tok@ow{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.67,0.13,1.00}{##1}}}
|
||||
\def\PY@tok@sb{\def\PY@tc##1{\textcolor[rgb]{0.73,0.13,0.13}{##1}}}
|
||||
\def\PY@tok@k{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.00,0.50,0.00}{##1}}}
|
||||
\def\PY@tok@se{\let\PY@bf=\textbf\def\PY@tc##1{\textcolor[rgb]{0.73,0.40,0.13}{##1}}}
|
||||
\def\PY@tok@sd{\let\PY@it=\textit\def\PY@tc##1{\textcolor[rgb]{0.73,0.13,0.13}{##1}}}
|
||||
|
||||
\def\PYZbs{\char`\\}
|
||||
\def\PYZus{\char`\_}
|
||||
\def\PYZob{\char`\{}
|
||||
\def\PYZcb{\char`\}}
|
||||
\def\PYZca{\char`\^}
|
||||
\def\PYZsh{\char`\#}
|
||||
\def\PYZpc{\char`\%}
|
||||
\def\PYZdl{\char`\$}
|
||||
\def\PYZti{\char`\~}
|
||||
% for compatibility with earlier versions
|
||||
\def\PYZat{@}
|
||||
\def\PYZlb{[}
|
||||
\def\PYZrb{]}
|
||||
@ -0,0 +1,988 @@
|
||||
\documentclass{beamer}
|
||||
|
||||
\usepackage[utf8x]{inputenc}
|
||||
\usepackage{fancyvrb}
|
||||
\usepackage{color}
|
||||
\usepackage{graphicx}
|
||||
|
||||
\usetheme{Darmstadt}
|
||||
|
||||
\title {High-level parallel programming in C++}
|
||||
\author{Dénes Mátételki}
|
||||
\institute{www.emerson.com}
|
||||
\date{March 18, 2012}
|
||||
|
||||
\makeatletter
|
||||
\include{colordefs}
|
||||
\makeatother
|
||||
|
||||
\begin{document}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}
|
||||
\titlepage
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}
|
||||
\frametitle{Table of contents}
|
||||
\tableofcontents
|
||||
\end{frame}
|
||||
|
||||
\section{Theory}
|
||||
|
||||
\subsection{High level vs. low level}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}{Comparison}
|
||||
\begin{columns}[t]
|
||||
\column{1.5in}
|
||||
|
||||
\begin{block}{High level}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Auto scaling-up
|
||||
\item Threadpool handling, load balancing.
|
||||
\item Synchronization and mutexes are handled.
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
|
||||
\column{1.5in}
|
||||
|
||||
\begin{block}{Low level}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Manual thread creation.
|
||||
\item Manual joins and mutex handling.
|
||||
\item Better for event and I/O based threading.
|
||||
\item Compiler and external library independend.
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
|
||||
\end{columns}
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}{Compared softwares (performance, code complexity)}
|
||||
\begin{columns}[t]
|
||||
\column{1.5in}
|
||||
|
||||
\begin{block}{Used}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Standard c++ (serial examples)
|
||||
\item openMP\cite{openmp}
|
||||
\item Intel Thread Building Blocks (TBB)\cite{itbb}
|
||||
\item QtConcurrent\cite{qtconcurrent}
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
|
||||
\column{1.5in}
|
||||
|
||||
\begin{block}{Skipped}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item std::thread, std::mutex (c++0x)\cite{cpp_thread}
|
||||
\item POSIX threads\cite{posix_threads}
|
||||
\item QThread\cite{qt_thread}
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
|
||||
\end{columns}
|
||||
|
||||
|
||||
\begin{exampleblock}{Co-existence\cite{itbb_openmp_nativethreads}}
|
||||
\small
|
||||
Possible, but the separate threadpools can lead to oversubscription.
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}{Comparison}
|
||||
|
||||
\begin{columns}[t]
|
||||
\column{1.5in}
|
||||
|
||||
\begin{block}{openMP}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Compiler support needed.
|
||||
\item C, C++, fortran.
|
||||
\item Best for bounded loops.
|
||||
\item No need for big code re-write.
|
||||
\item Hard to debug.
|
||||
\item Managed by a non-profit organization.
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
\column{1.5in}
|
||||
|
||||
|
||||
\begin{block}{Intel TBB}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Object oriented.
|
||||
\item Concurrent data types.
|
||||
\item Parallel algorithms.
|
||||
\item Work stealing: dynamic load sharing.
|
||||
\item Relies heavily on templates.
|
||||
\item Heavy code rewrite is needed.
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
|
||||
\column{1.5in}
|
||||
|
||||
\begin{block}{QtConcurrent}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Object oriented
|
||||
\item Limited number of algorithms.
|
||||
\item ...
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
|
||||
\end{columns}
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
||||
\subsection{Algorithms}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Used algorithms for testing}
|
||||
|
||||
\begin{block}{List}
|
||||
\begin{itemize}
|
||||
\item Map - Applies a given function to each element of a container.
|
||||
\item Reduction - Combines the results of sub-parts.
|
||||
\item Sort - Puts elements of a list in a certain order.
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item The used container is an \verb|std::vector<float>|
|
||||
\item Container size was 60 million with random floats [1, 1000]
|
||||
\item Execution times are the avareges of 3 executions.
|
||||
\item Used hardware was an Intel Xeon 64-bit machine with 6 cores (12 threads), 3,4Mz.
|
||||
\item Compiled with gcc-4.4 and use flags: \verb|-O3| \verb|-ffast-math| \verb|-fwhole-program|
|
||||
\verb|-fomit-frame-pointer| \verb|-march=native| \verb|-m64|
|
||||
\end{itemize}
|
||||
\end{exampleblock}
|
||||
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
||||
\section{Code samples}
|
||||
|
||||
\subsection{Map}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Serial map}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{float} \PY{n}{modify}\PY{p}{(}\PY{k+kt}{float} \PY{n}{value}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{k}{return} \PY{l+m+mf}{13.37} \PY{o}{*} \PY{n}{pow}\PY{p}{(}\PY{n}{sqrt}\PY{p}{(}\PY{n}{value}\PY{p}{)}\PY{p}{,} \PY{n}{log}\PY{p}{(}\PY{n}{value}\PY{p}{)}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
|
||||
\PY{k+kt}{void} \PY{n}{serialMap}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{k}{for} \PY{p}{(}\PY{n}{size\PYZus{}t} \PY{n}{i} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;} \PY{n}{i} \PY{o}{<} \PY{n}{data}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i}\PY{o}{+}\PY{o}{+}\PY{p}{)}
|
||||
\PY{n}{modify}\PY{p}{(}\PY{n}{data}\PY{p}{[}\PY{n}{i}\PY{p}{]}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
\end{block}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item ``chunksize'' equals the size of the data.
|
||||
\item This modify function will be used by the parallel examples too.
|
||||
\end{itemize}
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{openMP parallel map}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{n}{openMpMap}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{,}
|
||||
\PY{k}{const} \PY{k+kt}{int} \PY{n}{numberOfThreads}\PY{p}{,}
|
||||
\PY{k}{const} \PY{k+kt}{int} \PY{n}{chunkSize}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{n}{size\PYZus{}t} \PY{n}{i}\PY{p}{;}
|
||||
|
||||
\PY{c+cp}{\PYZsh{}}\PY{c+cp}{pragma omp parallel for \PYZbs{}}
|
||||
\PY{c+cp}{ default(shared) private(i) \PYZbs{}}
|
||||
\PY{c+cp}{ schedule(dynamic, chunkSize) \PYZbs{}}
|
||||
\PY{c+cp}{ num\PYZus{}threads(numberOfThreads)}
|
||||
|
||||
\PY{k}{for} \PY{p}{(}\PY{n}{i} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;} \PY{n}{i} \PY{o}{<} \PY{n}{data}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i}\PY{o}{+}\PY{o}{+}\PY{p}{)}
|
||||
\PY{n}{data}\PY{p}{[}\PY{n}{i}\PY{p}{]} \PY{o}{=} \PY{n}{modify}\PY{p}{(}\PY{n}{data}\PY{p}{[}\PY{n}{i}\PY{p}{]}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
Making it run in parallel is just a single pragma line.
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{Intel TBB map}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k}{class} \PY{n+nc}{itbbMap} \PY{p}{\PYZob{}}
|
||||
\PY{k}{public}\PY{o}{:}
|
||||
|
||||
\PY{n}{itbbMap}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{)}
|
||||
\PY{o}{:} \PY{n}{m\PYZus{}data}\PY{p}{(}\PY{n}{data}\PY{p}{)} \PY{p}{\PYZob{}}\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{void} \PY{k}{operator}\PY{p}{(}\PY{p}{)}\PY{p}{(}\PY{k}{const} \PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{blocked\PYZus{}range}\PY{o}{<}\PY{n}{size\PYZus{}t}\PY{o}{>}\PY{o}{&} \PY{n}{r}\PY{p}{)} \PY{k}{const} \PY{p}{\PYZob{}}
|
||||
\PY{k}{for}\PY{p}{(} \PY{n}{size\PYZus{}t} \PY{n}{i} \PY{o}{=} \PY{n}{r}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i} \PY{o}{!}\PY{o}{=} \PY{n}{r}\PY{p}{.}\PY{n}{end}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i}\PY{o}{+}\PY{o}{+} \PY{p}{)}
|
||||
\PY{n}{m\PYZus{}data}\PY{p}{[}\PY{n}{i}\PY{p}{]} \PY{o}{=} \PY{n}{modify}\PY{p}{(}\PY{n}{m\PYZus{}data}\PY{p}{[}\PY{n}{i}\PY{p}{]}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k}{private}\PY{o}{:}
|
||||
\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{m\PYZus{}data}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}\PY{p}{;}
|
||||
|
||||
|
||||
\PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{task\PYZus{}scheduler\PYZus{}init} \PY{n}{init}\PY{p}{(}\PY{n}{NUMBER\PYZus{}OF\PYZus{}THREADS}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{itbbMap} \PY{n}{im}\PY{p}{(}\PY{n}{data}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{parallel\PYZus{}for}\PY{p}{(}\PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{blocked\PYZus{}range}\PY{o}{<}\PY{n}{size\PYZus{}t}\PY{o}{>}\PY{p}{(}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{data}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{,} \PY{n}{CHUNK\PYZus{}SIZE}\PY{p}{)}\PY{p}{,} \PY{n}{im}\PY{p}{)}\PY{p}{;}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
Running a functor on chunks in parallel.
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{QtConcurrent map}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{n}{QtMap}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{n}{QtConcurrent}\PY{o}{:}\PY{o}{:}\PY{n}{blockingMap}\PY{p}{(}\PY{n}{data}\PY{p}{,} \PY{n}{modify}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{n}{QThreadPool}\PY{o}{:}\PY{o}{:}\PY{n}{globalInstance}\PY{p}{(}\PY{p}{)}\PY{o}{-}\PY{o}{>}\PY{n}{setMaxThreadCount}\PY{p}{(}\PY{n}{NUMBER\PYZus{}OF\PYZus{}THREADS}\PY{p}{)}\PY{p}{;}
|
||||
\end{Verbatim}
|
||||
|
||||
|
||||
\end{block}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Chunksize is 1.
|
||||
\item Blocks till the iterator reaches the end.
|
||||
\end{itemize}
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Map execution times}
|
||||
|
||||
\begin{center}
|
||||
\includegraphics[height=5cm]{map.png}
|
||||
\end{center}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
Serial remained the fastest (memory bound?) - No need to paralellize.
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
\subsection{Reduce}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{Serial reduce}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{float} \PY{n}{serialReduce}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{k+kt}{float} \PY{n}{min}\PY{p}{(}\PY{n}{FLT\PYZus{}MAX}\PY{p}{)}\PY{p}{;}
|
||||
\PY{k}{for} \PY{p}{(}\PY{n}{size\PYZus{}t} \PY{n}{i} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;} \PY{n}{i} \PY{o}{<} \PY{n}{data}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i}\PY{o}{+}\PY{o}{+}\PY{p}{)}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{data}\PY{p}{[}\PY{n}{i}\PY{p}{]} \PY{o}{<} \PY{n}{min}\PY{p}{)}
|
||||
\PY{n}{min} \PY{o}{=} \PY{n}{data}\PY{p}{[}\PY{n}{i}\PY{p}{]}\PY{p}{;}
|
||||
|
||||
\PY{k}{return} \PY{n}{min}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Minimum value search.
|
||||
\item Not actually a reduce.
|
||||
\item Following examples will try to achive this too.
|
||||
\end{itemize}
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{openMP reduce}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{int} \PY{n}{openMpReduce}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{,}
|
||||
\PY{k}{const} \PY{k+kt}{int} \PY{n}{numberOfThreads}\PY{p}{,}
|
||||
\PY{k}{const} \PY{k+kt}{int} \PY{n}{chunkSize}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{n}{size\PYZus{}t} \PY{n}{i}\PY{p}{;}
|
||||
\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>} \PY{n}{separate\PYZus{}results}\PY{p}{(}\PY{n}{numberOfThreads}\PY{p}{,} \PY{n}{FLT\PYZus{}MAX}\PY{p}{)}\PY{p}{;}
|
||||
|
||||
\PY{c+cp}{\PYZsh{}}\PY{c+cp}{pragma omp parallel \PYZbs{}}
|
||||
\PY{c+cp}{ default(shared) private(i) \PYZbs{}}
|
||||
\PY{c+cp}{ num\PYZus{}threads(numberOfThreads)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{k+kt}{int} \PY{n}{threadId} \PY{o}{=} \PY{n}{omp\PYZus{}get\PYZus{}thread\PYZus{}num}\PY{p}{(}\PY{p}{)}\PY{p}{;}
|
||||
|
||||
\PY{c+cp}{\PYZsh{}}\PY{c+cp}{pragma omp for schedule(dynamic, chunkSize)}
|
||||
|
||||
\PY{k}{for} \PY{p}{(}\PY{n}{i} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;} \PY{n}{i} \PY{o}{<} \PY{n}{data}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i}\PY{o}{+}\PY{o}{+}\PY{p}{)}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{separate\PYZus{}results}\PY{p}{[}\PY{n}{threadId}\PY{p}{]} \PY{o}{<} \PY{n}{data}\PY{p}{[}\PY{n}{i}\PY{p}{]}\PY{p}{)}
|
||||
\PY{n}{separate\PYZus{}results}\PY{p}{[}\PY{n}{threadId}\PY{p}{]} \PY{o}{=} \PY{n}{data}\PY{p}{[}\PY{n}{i}\PY{p}{]}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{float} \PY{n}{min}\PY{p}{(}\PY{n}{FLT\PYZus{}MAX}\PY{p}{)}\PY{p}{;}
|
||||
\PY{k}{for} \PY{p}{(}\PY{n}{i} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;} \PY{n}{i} \PY{o}{<} \PY{n}{numberOfThreads}\PY{p}{;} \PY{n}{i}\PY{o}{+}\PY{o}{+}\PY{p}{)}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{separate\PYZus{}results}\PY{p}{[}\PY{n}{i}\PY{p}{]} \PY{o}{<} \PY{n}{min}\PY{p}{)}
|
||||
\PY{n}{min} \PY{o}{=} \PY{n}{separate\PYZus{}results}\PY{p}{[}\PY{n}{i}\PY{p}{]}\PY{p}{;}
|
||||
|
||||
\PY{k}{return} \PY{n}{min}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
|
||||
\end{block}
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{Intel TBB reduce}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k}{class} \PY{n+nc}{itbbReduce} \PY{p}{\PYZob{}}
|
||||
\PY{k}{const} \PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{m\PYZus{}data}\PY{p}{;}
|
||||
\PY{k}{public}\PY{o}{:}
|
||||
\PY{k+kt}{float} \PY{n}{m\PYZus{}min}\PY{p}{;}
|
||||
|
||||
\PY{n}{itbbReduce}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{)} \PY{o}{:} \PY{n}{m\PYZus{}data}\PY{p}{(}\PY{n}{data}\PY{p}{)} \PY{p}{,} \PY{n}{m\PYZus{}min}\PY{p}{(}\PY{n}{FLT\PYZus{}MAX}\PY{p}{)} \PY{p}{\PYZob{}}\PY{p}{\PYZcb{}}
|
||||
\PY{n}{itbbReduce}\PY{p}{(}\PY{n}{itbbReduce}\PY{o}{&} \PY{n}{other}\PY{p}{,} \PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{split}\PY{p}{)} \PY{o}{:} \PY{n}{m\PYZus{}data}\PY{p}{(}\PY{n}{other}\PY{p}{.}\PY{n}{m\PYZus{}data}\PY{p}{)}\PY{p}{,} \PY{n}{m\PYZus{}min}\PY{p}{(}\PY{n}{FLT\PYZus{}MAX}\PY{p}{)} \PY{p}{\PYZob{}}\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{void} \PY{k}{operator}\PY{p}{(}\PY{p}{)}\PY{p}{(}\PY{k}{const} \PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{blocked\PYZus{}range}\PY{o}{<}\PY{n}{size\PYZus{}t}\PY{o}{>}\PY{o}{&} \PY{n}{r}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{k+kt}{float} \PY{n}{min} \PY{o}{=} \PY{n}{m\PYZus{}min}\PY{p}{;}
|
||||
\PY{k}{for}\PY{p}{(}\PY{n}{size\PYZus{}t} \PY{n}{i} \PY{o}{=} \PY{n}{r}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i} \PY{o}{!}\PY{o}{=} \PY{n}{r}\PY{p}{.}\PY{n}{end}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i}\PY{o}{+}\PY{o}{+}\PY{p}{)}
|
||||
\PY{k}{if} \PY{p}{(} \PY{n}{m\PYZus{}data}\PY{p}{[}\PY{n}{i}\PY{p}{]} \PY{o}{<} \PY{n}{min} \PY{p}{)}
|
||||
\PY{n}{min} \PY{o}{=} \PY{n}{m\PYZus{}data}\PY{p}{[}\PY{n}{i}\PY{p}{]}\PY{p}{;}
|
||||
|
||||
\PY{n}{m\PYZus{}min} \PY{o}{=} \PY{n}{min}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{void} \PY{n}{join}\PY{p}{(}\PY{k}{const} \PY{n}{itbbReduce}\PY{o}{&} \PY{n}{other}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{k}{if} \PY{p}{(} \PY{n}{other}\PY{p}{.}\PY{n}{m\PYZus{}min} \PY{o}{<} \PY{n}{m\PYZus{}min} \PY{p}{)}
|
||||
\PY{n}{m\PYZus{}min} \PY{o}{=} \PY{n}{other}\PY{p}{.}\PY{n}{m\PYZus{}min}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}\PY{p}{;}
|
||||
|
||||
\PY{n}{itbbReduce} \PY{n}{mif}\PY{p}{(}\PY{n}{data}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{parallel\PYZus{}reduce}\PY{p}{(}\PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{blocked\PYZus{}range}\PY{o}{<}\PY{n}{size\PYZus{}t}\PY{o}{>}\PY{p}{(}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{data}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{,} \PY{n}{CHUNK\PYZus{}SIZE}\PY{p}{)}\PY{p}{,} \PY{n}{mif}\PY{p}{)}\PY{p}{;}
|
||||
\PY{k+kt}{float} \PY{n}{min} \PY{o}{=} \PY{n}{mif}\PY{p}{.}\PY{n}{m\PYZus{}min}\PY{p}{;}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\end{frame}
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{QtConcurrent reduce}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{n}{findMinimum}\PY{p}{(}\PY{k}{const} \PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{:}\PY{o}{:}\PY{n}{const\PYZus{}iterator} \PY{n}{begin}\PY{p}{,}
|
||||
\PY{k}{const} \PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{:}\PY{o}{:}\PY{n}{const\PYZus{}iterator} \PY{n}{end}\PY{p}{,}
|
||||
\PY{k+kt}{float} \PY{o}{*}\PY{n}{result}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{n}{result} \PY{o}{=} \PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{min\PYZus{}element}\PY{p}{(}\PY{n}{begin}\PY{p}{,} \PY{n}{end}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
|
||||
\PY{k+kt}{float} \PY{n}{QtReduce}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{,}
|
||||
\PY{k}{const} \PY{k+kt}{int} \PY{n}{numberOfThreads}\PY{p}{,}
|
||||
\PY{k}{const} \PY{k+kt}{int} \PY{n}{chunkSize}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>} \PY{n}{separate\PYZus{}results}\PY{p}{(}\PY{n}{numberOfThreads}\PY{p}{,} \PY{n}{FLT\PYZus{}MAX}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{QFutureSynchronizer}\PY{o}{<}\PY{k+kt}{void}\PY{o}{>} \PY{n}{synchronizer}\PY{p}{;}
|
||||
|
||||
\PY{k}{for}\PY{p}{(}\PY{k+kt}{int} \PY{n}{i} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;} \PY{n}{i} \PY{o}{<} \PY{n}{numberOfThreads}\PY{p}{;} \PY{n}{i}\PY{o}{+}\PY{o}{+}\PY{p}{)}
|
||||
\PY{n}{synchronizer}\PY{p}{.}\PY{n}{addFuture}\PY{p}{(}\PY{n}{QtConcurrent}\PY{o}{:}\PY{o}{:}\PY{n}{run}\PY{p}{(}\PY{n}{findLocalMinimum}\PY{p}{,}
|
||||
\PY{n}{data}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{o}{+}\PY{n}{i}\PY{o}{*}\PY{n}{chunkSize}\PY{p}{,}
|
||||
\PY{n}{data}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{o}{+}\PY{p}{(}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{1}\PY{p}{)}\PY{o}{*}\PY{n}{chunkSize}\PY{p}{,}
|
||||
\PY{n}{separate\PYZus{}results}\PY{p}{.}\PY{n}{data}\PY{p}{(}\PY{p}{)}\PY{o}{+}\PY{n}{i}\PY{p}{)}\PY{p}{)}\PY{p}{;}
|
||||
|
||||
\PY{n}{synchronizer}\PY{p}{.}\PY{n}{waitForFinished}\PY{p}{(}\PY{p}{)}\PY{p}{;}
|
||||
|
||||
\PY{k+kt}{float} \PY{n}{min}\PY{p}{(}\PY{n}{FLT\PYZus{}MAX}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{findMinimum}\PY{p}{(}\PY{n}{separate\PYZus{}results}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{p}{,} \PY{n}{separate\PYZus{}results}\PY{p}{.}\PY{n}{end}\PY{p}{(}\PY{p}{)}\PY{p}{,} \PY{n}{min}\PY{p}{)}\PY{p}{;}
|
||||
\PY{k}{return} \PY{n}{min}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Reduce execution times}
|
||||
|
||||
\begin{center}
|
||||
\includegraphics[height=5cm]{reduce.png}
|
||||
\end{center}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
No need for more than 4 threads.
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
\subsection{Sort}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{Serial sort}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{n}{serialSort}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{sort}\PY{p}{(}\PY{n}{data}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{p}{,} \PY{n}{data}\PY{p}{.}\PY{n}{end}\PY{p}{(}\PY{p}{)}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\begin{exampleblock}{Note: quicksort}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Pick a pivot point.
|
||||
\item Partition: Swap elements compared to pivot point.
|
||||
\item Recursively calls itself with the 2 new partitions.
|
||||
\end{itemize}
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{openMP, Intel TBB sort}
|
||||
|
||||
\begin{block}{openMP c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{c+cp}{\PYZsh{}}\PY{c+cp}{include <parallel}\PY{c+cp}{/}\PY{c+cp}{algorithm>}
|
||||
|
||||
\PY{k+kt}{void} \PY{n}{openMpSort}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{n}{\PYZus{}\PYZus{}gnu\PYZus{}parallel}\PY{o}{:}\PY{o}{:}\PY{n}{sort}\PY{p}{(}\PY{n}{data}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{p}{,} \PY{n}{data}\PY{p}{.}\PY{n}{end}\PY{p}{(}\PY{p}{)}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
Some algorithms are already rewritten to work in parallel with openMP.
|
||||
\end{exampleblock}
|
||||
|
||||
\begin{block}{Intel TBB c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{n}{itbbSort}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{parallel\PYZus{}sort}\PY{p}{(}\PY{n}{data}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{p}{,} \PY{n}{data}\PY{p}{.}\PY{n}{end}\PY{p}{(}\PY{p}{)}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Sort execution times}
|
||||
|
||||
\begin{center}
|
||||
\includegraphics[height=5cm]{sort1.png}
|
||||
\end{center}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
No need for more than 6 threads.
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{Custom QtConcurrent sort}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k}{template} \PY{o}{<}\PY{k}{class} \PY{n+nc}{SortType}\PY{o}{>}
|
||||
\PY{k+kt}{long} \PY{n}{QsPartition}\PY{p}{(}\PY{n}{SortType} \PY{n}{outputArray}\PY{p}{[}\PY{p}{]}\PY{p}{,} \PY{k+kt}{long} \PY{n}{left}\PY{p}{,} \PY{k+kt}{long} \PY{n}{right}\PY{p}{)} \PY{p}{\PYZob{}} \PY{p}{.}\PY{p}{.}\PY{p}{.} \PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k}{template} \PY{o}{<}\PY{k}{class} \PY{n+nc}{SortType}\PY{o}{>}
|
||||
\PY{k+kt}{void} \PY{n}{QsSequential}\PY{p}{(}\PY{n}{SortType} \PY{n}{array}\PY{p}{[}\PY{p}{]}\PY{p}{,} \PY{k}{const} \PY{k+kt}{long} \PY{n}{left}\PY{p}{,} \PY{k}{const} \PY{k+kt}{long} \PY{n}{right}\PY{p}{)} \PY{p}{\PYZob{}} \PY{p}{.}\PY{p}{.}\PY{p}{.} \PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k}{template} \PY{o}{<}\PY{k}{class} \PY{n+nc}{SortType}\PY{o}{>}
|
||||
\PY{k+kt}{void} \PY{n}{QuickSortTask} \PY{p}{(}\PY{n}{SortType} \PY{n}{array}\PY{p}{[}\PY{p}{]}\PY{p}{,} \PY{k}{const} \PY{k+kt}{long} \PY{n}{left}\PY{p}{,} \PY{k}{const} \PY{k+kt}{long} \PY{n}{right}\PY{p}{,} \PY{k}{const} \PY{k+kt}{int} \PY{n}{deep}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{left} \PY{o}{<} \PY{n}{right}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{deep}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{k}{const} \PY{k+kt}{long} \PY{n}{part} \PY{o}{=} \PY{n}{QsPartition}\PY{p}{(}\PY{n}{array}\PY{p}{,} \PY{n}{left}\PY{p}{,} \PY{n}{right}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{QtConcurrent}\PY{o}{:}\PY{o}{:}\PY{n}{run}\PY{p}{(}\PY{n}{QuickSortTask}\PY{o}{<}\PY{n}{SortType}\PY{o}{>}\PY{p}{,} \PY{n}{array}\PY{p}{,} \PY{n}{part} \PY{o}{+} \PY{l+m+mi}{1}\PY{p}{,} \PY{n}{right}\PY{p}{,} \PY{n}{deep} \PY{o}{-} \PY{l+m+mi}{1}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{QtConcurrent}\PY{o}{:}\PY{o}{:}\PY{n}{run}\PY{p}{(}\PY{n}{QuickSortTask}\PY{o}{<}\PY{n}{SortType}\PY{o}{>}\PY{p}{,} \PY{n}{array}\PY{p}{,} \PY{n}{left}\PY{p}{,} \PY{n}{part} \PY{o}{-} \PY{l+m+mi}{1}\PY{p}{,} \PY{n}{deep} \PY{o}{-} \PY{l+m+mi}{1}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}} \PY{k}{else} \PY{p}{\PYZob{}}
|
||||
\PY{k}{const} \PY{k+kt}{long} \PY{n}{part} \PY{o}{=} \PY{n}{QsPartition}\PY{p}{(}\PY{n}{array}\PY{p}{,} \PY{n}{left}\PY{p}{,} \PY{n}{right}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{QsSequential}\PY{p}{(}\PY{n}{array}\PY{p}{,}\PY{n}{part} \PY{o}{+} \PY{l+m+mi}{1}\PY{p}{,}\PY{n}{right}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{QsSequential}\PY{p}{(}\PY{n}{array}\PY{p}{,}\PY{n}{left}\PY{p}{,}\PY{n}{part} \PY{o}{-} \PY{l+m+mi}{1}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{void} \PY{n}{QtSort}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{data}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{n}{QtConcurrent}\PY{o}{:}\PY{o}{:}\PY{n}{run}\PY{p}{(}\PY{n}{QuickSortTask}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{p}{,} \PY{n}{data}\PY{p}{.}\PY{n}{data}\PY{p}{(}\PY{p}{)}\PY{p}{,} \PY{l+m+mi}{0}\PY{p}{,} \PY{n}{data}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)} \PY{o}{-} \PY{l+m+mi}{1}\PY{p}{,} \PY{l+m+mi}{6}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{QThreadPool}\PY{o}{:}\PY{o}{:}\PY{n}{globalInstance}\PY{p}{(}\PY{p}{)}\PY{o}{-}\PY{o}{>}\PY{n}{waitForDone}\PY{p}{(}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{Custom openMP sort}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{n}{sample\PYZus{}qsort}\PY{p}{(}\PY{k+kt}{float}\PY{o}{*} \PY{n}{begin}\PY{p}{,} \PY{k+kt}{float}\PY{o}{*} \PY{n}{end}\PY{p}{)} \PY{p}{\PYZob{}} \PY{p}{.}\PY{p}{.}\PY{p}{.} \PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{void} \PY{n}{sample\PYZus{}qsort\PYZus{}serial}\PY{p}{(}\PY{k+kt}{float}\PY{o}{*} \PY{n}{begin}\PY{p}{,} \PY{k+kt}{float}\PY{o}{*} \PY{n}{end}\PY{p}{)} \PY{p}{\PYZob{}} \PY{p}{.}\PY{p}{.}\PY{p}{.} \PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{void} \PY{n}{sample\PYZus{}qsort\PYZus{}adaptive}\PY{p}{(}\PY{k+kt}{float}\PY{o}{*} \PY{n}{begin}\PY{p}{,} \PY{k+kt}{float}\PY{o}{*} \PY{n}{end}\PY{p}{,} \PY{k}{const} \PY{k+kt}{long} \PY{n}{nthreshold}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{begin} \PY{o}{!}\PY{o}{=} \PY{n}{end}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{c+c1}{// parition ...}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{end} \PY{o}{-} \PY{n}{begin} \PY{o}{+} \PY{l+m+mi}{1} \PY{o}{<}\PY{o}{=} \PY{n}{nthreshold}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{n}{sample\PYZus{}qsort\PYZus{}serial}\PY{p}{(}\PY{n}{begin}\PY{p}{,} \PY{n}{middle}\PY{p}{)}\PY{p}{;}
|
||||
\PY{n}{sample\PYZus{}qsort\PYZus{}serial}\PY{p}{(}\PY{o}{+}\PY{o}{+}\PY{n}{middle}\PY{p}{,} \PY{o}{+}\PY{o}{+}\PY{n}{end}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}} \PY{k}{else} \PY{p}{\PYZob{}}
|
||||
\PY{c+cp}{\PYZsh{}}\PY{c+cp}{pragma omp task}
|
||||
\PY{n}{sample\PYZus{}qsort\PYZus{}adaptive}\PY{p}{(}\PY{n}{begin}\PY{p}{,} \PY{n}{middle}\PY{p}{,} \PY{n}{nthreshold}\PY{p}{)}\PY{p}{;}
|
||||
\PY{c+cp}{\PYZsh{}}\PY{c+cp}{pragma omp task}
|
||||
\PY{n}{sample\PYZus{}qsort\PYZus{}adaptive}\PY{p}{(}\PY{o}{+}\PY{o}{+}\PY{n}{middle}\PY{p}{,} \PY{o}{+}\PY{o}{+}\PY{n}{end}\PY{p}{,} \PY{n}{nthreshold}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{void} \PY{n}{sample\PYZus{}qsort\PYZus{}adaptive}\PY{p}{(}\PY{k+kt}{float}\PY{o}{*} \PY{n}{begin}\PY{p}{,} \PY{k+kt}{float}\PY{o}{*} \PY{n}{end}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{k+kt}{long} \PY{n}{nthreshold} \PY{o}{=} \PY{n}{ceil}\PY{p}{(}\PY{n}{sqrt}\PY{p}{(}\PY{n}{end} \PY{o}{-} \PY{n}{begin} \PY{o}{+} \PY{l+m+mi}{1}\PY{p}{)}\PY{p}{)} \PY{o}{/} \PY{l+m+mi}{2}\PY{p}{;}
|
||||
\PY{c+cp}{\PYZsh{}}\PY{c+cp}{pragma omp parallel}
|
||||
\PY{c+cp}{\PYZsh{}}\PY{c+cp}{pragma omp single nowait}
|
||||
\PY{n}{sample\PYZus{}qsort\PYZus{}adaptive}\PY{p}{(}\PY{n}{begin}\PY{p}{,} \PY{n}{end}\PY{p}{,} \PY{n}{nthreshold}\PY{p}{)}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Sort times of custom algorithms}
|
||||
|
||||
\begin{center}
|
||||
\includegraphics[height=5cm]{sort2.png}
|
||||
\end{center}
|
||||
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
Container size is 6M - miserable...
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{Two quicksort approach to }
|
||||
|
||||
\begin{columns}[t]
|
||||
|
||||
\column{1.7in}
|
||||
\begin{block}{Treshold}
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{n}{qsort}\PY{p}{(}\PY{k+kt}{float}\PY{o}{*} \PY{n}{begin}\PY{p}{,}
|
||||
\PY{k+kt}{float}\PY{o}{*} \PY{n}{end}\PY{p}{,}
|
||||
\PY{k}{const} \PY{k+kt}{long} \PY{n}{nthreshold}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{begin} \PY{o}{!}\PY{o}{=} \PY{n}{end}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{c+c1}{// parition ...}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{end}\PY{o}{-}\PY{n}{begin}\PY{o}{+}\PY{l+m+mi}{1} \PY{o}{<}\PY{o}{=} \PY{n}{nthreshold}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{c+c1}{// serial sort ...}
|
||||
\PY{p}{\PYZcb{}} \PY{k}{else} \PY{p}{\PYZob{}}
|
||||
\PY{c+c1}{// parallel sort ...}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{long} \PY{n}{deep} \PY{o}{=}
|
||||
\PY{n}{ceil}\PY{p}{(}\PY{n}{sqrt}\PY{p}{(}\PY{n}{end} \PY{o}{-} \PY{n}{begin} \PY{o}{+} \PY{l+m+mi}{1}\PY{p}{)}\PY{p}{)} \PY{o}{/} \PY{l+m+mi}{2}\PY{p}{;}
|
||||
\end{Verbatim}
|
||||
|
||||
\end{block}
|
||||
|
||||
\column{1.5in}
|
||||
\begin{block}{Depth}
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{n}{qsort}\PY{p}{(}\PY{k+kt}{float}\PY{o}{*} \PY{n}{begin}\PY{p}{,}
|
||||
\PY{k+kt}{float}\PY{o}{*} \PY{n}{end}\PY{p}{,}
|
||||
\PY{k}{const} \PY{k+kt}{int} \PY{n}{deep}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{begin} \PY{o}{!}\PY{o}{=} \PY{n}{end}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{c+c1}{// parition ...}
|
||||
\PY{k}{if} \PY{p}{(}\PY{n}{deep}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{c+c1}{// serial sort ...}
|
||||
\PY{p}{\PYZcb{}} \PY{k}{else} \PY{p}{\PYZob{}}
|
||||
\PY{c+c1}{// parallel sort with deep-1}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{k+kt}{long} \PY{n}{deep} \PY{o}{=} \PY{l+m+mi}{15}\PY{p}{;}
|
||||
\end{Verbatim}
|
||||
\end{block}
|
||||
|
||||
|
||||
\end{columns}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
Depth seems simpler yet faster.
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
||||
\section{Final thoughts}
|
||||
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\subsection{Grainsize}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Chunk size}
|
||||
|
||||
\begin{center}
|
||||
\includegraphics[height=5cm]{chunksize.png}
|
||||
\end{center}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Unit is loop interaction per chunk. Default value is 1.
|
||||
\item Too small chunks can introduce more overhead than useful work.
|
||||
\end{itemize}
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Grain size}
|
||||
|
||||
\begin{center}
|
||||
\includegraphics[height=5cm]{grainsize.png}
|
||||
\end{center}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Unit is CPU cycles.
|
||||
\item Should be at least ~100.000.
|
||||
\end{itemize}
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Task stealing - Intel TBB}
|
||||
|
||||
\begin{block}{Task stealing}
|
||||
\begin{itemize}
|
||||
\item Each thread has a queue of tasks.
|
||||
\item If a thread has no more tasks then it ``steals'' from another.
|
||||
\item Think about tasks, not about threads when programming.
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
|
||||
\begin{exampleblock}{Threadpool}
|
||||
A threadpool with a commond concurrent queue of tasks is a common practice in networking servers.
|
||||
\end{exampleblock}
|
||||
|
||||
\begin{exampleblock}{Work stealing}
|
||||
Another implementation is Cilk\cite{cilk} - where each processor has a stack of frames.
|
||||
\end{exampleblock}
|
||||
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
||||
\subsection{Convolution}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{1D gaussian filter}
|
||||
|
||||
\begin{columns}[t]
|
||||
|
||||
\column{2.5in}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{n}{serialConvolution}\PY{p}{(}\PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{output}\PY{p}{,}
|
||||
\PY{k}{const} \PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{input}\PY{p}{,}
|
||||
\PY{k}{const} \PY{n}{std}\PY{o}{:}\PY{o}{:}\PY{n}{vector}\PY{o}{<}\PY{k+kt}{float}\PY{o}{>}\PY{o}{&} \PY{n}{kernel}\PY{p}{)}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{c+c1}{// skipping the edges: separate loops, paddings}
|
||||
\PY{c+c1}{// output.size == input.size()-kernel.size()-1;}
|
||||
|
||||
\PY{k}{for} \PY{p}{(}\PY{n}{size\PYZus{}t} \PY{n}{i} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;} \PY{n}{i} \PY{o}{<} \PY{n}{output}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i}\PY{o}{+}\PY{o}{+}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{k+kt}{float} \PY{n}{sum} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;}
|
||||
\PY{k}{for} \PY{p}{(}\PY{n}{size\PYZus{}t} \PY{n}{j} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;} \PY{n}{j} \PY{o}{<}\PY{o}{=} \PY{n}{kernel}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{j}\PY{o}{+}\PY{o}{+}\PY{p}{)}
|
||||
\PY{n}{sum} \PY{o}{+}\PY{o}{=} \PY{n}{input}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{n}{j}\PY{p}{]} \PY{o}{*} \PY{n}{kernel}\PY{p}{[}\PY{n}{j}\PY{p}{]}\PY{p}{;}
|
||||
|
||||
\PY{n}{output}\PY{p}{[}\PY{n}{i}\PY{p}{]} \PY{o}{=} \PY{n}{sum}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
|
||||
\end{block}
|
||||
|
||||
\column{1.5in}
|
||||
|
||||
\includegraphics[height=3cm]{1d_gauss.png}
|
||||
|
||||
\end{columns}
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\tiny
|
||||
\verb|float kernel[7] = { 0.06, 0.061, 0.242, 0.383, 0.242, 0.061, 0.06 }|
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
\begin{frame}[fragile]{Optimized convolution}
|
||||
|
||||
\begin{block}{c++ code}
|
||||
|
||||
\tiny
|
||||
\begin{Verbatim}[commandchars=\\\{\},numbers=left,firstnumber=1,stepnumber=1]
|
||||
\PY{k+kt}{void} \PY{k}{operator}\PY{p}{(}\PY{p}{)}\PY{p}{(}\PY{k}{const} \PY{n}{tbb}\PY{o}{:}\PY{o}{:}\PY{n}{blocked\PYZus{}range}\PY{o}{<}\PY{n}{size\PYZus{}t}\PY{o}{>}\PY{o}{&} \PY{n}{r}\PY{p}{)} \PY{k}{const}
|
||||
\PY{p}{\PYZob{}}
|
||||
\PY{c+c1}{// skipping the edges, shall be done in separate task}
|
||||
\PY{k}{const} \PY{k+kt}{float}\PY{o}{*} \PY{n}{p} \PY{o}{=} \PY{o}{&}\PY{n}{m\PYZus{}input}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]} \PY{o}{+} \PY{n}{r}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{p}{;}
|
||||
\PY{k+kt}{float}\PY{o}{*} \PY{n}{d} \PY{o}{=} \PY{o}{&}\PY{n}{m\PYZus{}output}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]} \PY{o}{+} \PY{n}{r}\PY{p}{.}\PY{n}{begin}\PY{p}{(}\PY{p}{)}\PY{p}{;}
|
||||
|
||||
\PY{k}{const} \PY{n}{size\PYZus{}t} \PY{n}{n} \PY{o}{=} \PY{n}{m\PYZus{}kernel}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{;}
|
||||
\PY{k+kt}{float} \PY{n}{k}\PY{p}{[}\PY{n}{n}\PY{p}{]}\PY{p}{;} \PY{c+c1}{// pre-read kernel}
|
||||
\PY{k+kt}{float} \PY{n}{c}\PY{p}{[}\PY{n}{n}\PY{p}{]}\PY{p}{;} \PY{c+c1}{// pre-read values}
|
||||
\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]} \PY{o}{=} \PY{n}{m\PYZus{}kernel}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{p}{;}
|
||||
\PY{k}{for} \PY{p}{(}\PY{n}{size\PYZus{}t} \PY{n}{i} \PY{o}{=} \PY{l+m+mi}{1}\PY{p}{;} \PY{n}{i} \PY{o}{<} \PY{n}{n}\PY{p}{;} \PY{o}{+}\PY{o}{+}\PY{n}{i}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{n}{c}\PY{p}{[}\PY{n}{i}\PY{p}{]} \PY{o}{=} \PY{n}{m\PYZus{}input}\PY{p}{[}\PY{n}{i}\PY{o}{-}\PY{l+m+mi}{1}\PY{p}{]}\PY{p}{;}
|
||||
\PY{n}{k}\PY{p}{[}\PY{n}{i}\PY{p}{]} \PY{o}{=} \PY{n}{m\PYZus{}kernel}\PY{p}{[}\PY{n}{i}\PY{p}{]}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
|
||||
\PY{c+c1}{// chunk size \PYZpc{} kernel.size() != 0 should be handled...}
|
||||
\PY{k}{for} \PY{p}{(}\PY{n}{size\PYZus{}t} \PY{n}{i} \PY{o}{=} \PY{l+m+mi}{0}\PY{p}{;} \PY{n}{i} \PY{o}{<} \PY{n}{r}\PY{p}{.}\PY{n}{size}\PY{p}{(}\PY{p}{)}\PY{p}{;} \PY{n}{i} \PY{o}{+}\PY{o}{=} \PY{n}{n}\PY{p}{)} \PY{p}{\PYZob{}}
|
||||
\PY{n}{d}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{0}\PY{p}{]} \PY{o}{=} \PY{p}{(}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]} \PY{o}{=} \PY{n}{p}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{0}\PY{p}{]}\PY{p}{)}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{1}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{p}{;}
|
||||
\PY{n}{d}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{1}\PY{p}{]} \PY{o}{=} \PY{p}{(}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]} \PY{o}{=} \PY{n}{p}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{1}\PY{p}{]}\PY{p}{)}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{1}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{p}{;}
|
||||
\PY{n}{d}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{2}\PY{p}{]} \PY{o}{=} \PY{p}{(}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]} \PY{o}{=} \PY{n}{p}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{2}\PY{p}{]}\PY{p}{)}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{1}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{p}{;}
|
||||
\PY{n}{d}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{3}\PY{p}{]} \PY{o}{=} \PY{p}{(}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]} \PY{o}{=} \PY{n}{p}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{3}\PY{p}{]}\PY{p}{)}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{1}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{p}{;}
|
||||
\PY{n}{d}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{4}\PY{p}{]} \PY{o}{=} \PY{p}{(}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]} \PY{o}{=} \PY{n}{p}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{4}\PY{p}{]}\PY{p}{)}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{1}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{p}{;}
|
||||
\PY{n}{d}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{5}\PY{p}{]} \PY{o}{=} \PY{p}{(}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]} \PY{o}{=} \PY{n}{p}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{5}\PY{p}{]}\PY{p}{)}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{1}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{p}{;}
|
||||
\PY{n}{d}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{6}\PY{p}{]} \PY{o}{=} \PY{p}{(}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{1}\PY{p}{]} \PY{o}{=} \PY{n}{p}\PY{p}{[}\PY{n}{i}\PY{o}{+}\PY{l+m+mi}{6}\PY{p}{]}\PY{p}{)}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{3}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{5}\PY{p}{]}\PY{o}{+}\PY{n}{c}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{]}\PY{o}{*}\PY{n}{k}\PY{p}{[}\PY{l+m+mi}{6}\PY{p}{]}\PY{p}{;}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\PY{p}{\PYZcb{}}
|
||||
\end{Verbatim}
|
||||
|
||||
|
||||
\end{block}
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
\begin{frame}[fragile]{Convolution running times}
|
||||
|
||||
\begin{center}
|
||||
\includegraphics[height=5cm]{convolution.png}
|
||||
\end{center}
|
||||
|
||||
|
||||
\begin{exampleblock}{Note}
|
||||
\small
|
||||
Memory-read optimalization can result the same performance improvements as parallelization.
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
%----------- slide --------------------------------------------------%
|
||||
|
||||
|
||||
|
||||
\subsection{Summary}
|
||||
|
||||
\begin{frame}{Things to keep in mind}
|
||||
|
||||
\begin{block}{Checklist}
|
||||
\small
|
||||
\begin{itemize}
|
||||
\item Pass primitive types by value.
|
||||
\item Pass objects by address.
|
||||
\item Have function-local copies of member variables.
|
||||
\item Avoid to read values multiple times.
|
||||
\item Choose correct chunk size.
|
||||
\item Instead of shared memory, consider reduction.
|
||||
\item Plan datastructures to avoid memory-boundings.*
|
||||
\end{itemize}
|
||||
\end{block}
|
||||
|
||||
\pause
|
||||
|
||||
\begin{exampleblock}{*data-oriented design\cite{data_oriented_design}}
|
||||
\small
|
||||
If only someone could tell us more about it...
|
||||
\end{exampleblock}
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
||||
\begin{frame}{Links}
|
||||
|
||||
\tiny
|
||||
\begin{thebibliography}{100}
|
||||
\bibitem{openmp}openMP.\url{http://openmp.org}
|
||||
\bibitem{itbb}Intel Thread Building Blocks.\url{http://threadingbuildingblocks.org/}
|
||||
\bibitem{qtconcurrent}QtConcurrent.\url{http://doc.qt.nokia.com/4.8-snapshot/qtconcurrent.html}
|
||||
\bibitem{cilk}Cilk.\url{http://software.intel.com/en-us/articles/intel-cilk-plus}
|
||||
\bibitem{itbb_openmp_nativethreads}Comparison of Intel TBB, openMP and native threads.\url{http://software.intel.com/en-us/articles/intel-threading-building-blocks-openmp-or-native-threads/}
|
||||
|
||||
\bibitem{cpp_thread}std::thread in C++\url{http://en.cppreference.com/w/cpp/thread}
|
||||
\bibitem{posix_threads}POSIX threads tutorial.\url{http://www.yolinux.com/TUTORIALS/LinuxTutorialPosixThreads.html}
|
||||
\bibitem{qt_thread}Qt threads.\url{http://qt-project.org/doc/qt-4.8/threads.html}
|
||||
|
||||
\bibitem{data_oriented_design}Data oriented design.\url{http://gamesfromwithin.com/data-oriented-design}
|
||||
|
||||
\bibitem{latex_beamer}\LaTeX{} beamer class for creating presentations.\url{https://bitbucket.org/rivanvx/beamer/wiki/Home}
|
||||
\bibitem{gnuplot}Gnuplot - An open source plotting software.\url{http://www.gnuplot.info/}
|
||||
|
||||
\end{thebibliography}
|
||||
\end{frame}
|
||||
|
||||
|
||||
\end{document}
|
||||
Loading…
Reference in new issue