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Diffstat (limited to 'xmds2/realistic_Rb/OptimizationNotes.txt')
| -rw-r--r-- | xmds2/realistic_Rb/OptimizationNotes.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/xmds2/realistic_Rb/OptimizationNotes.txt b/xmds2/realistic_Rb/OptimizationNotes.txt new file mode 100644 index 0000000..4aea670 --- /dev/null +++ b/xmds2/realistic_Rb/OptimizationNotes.txt @@ -0,0 +1,17 @@ +I use gcc 4.7.1 + +Enabling OpenMP option makes my 6 core CPU busy on all 6 of them. +Surprisingly on Time x Velocity = 10000 x 10 grid it takes longer them with +disabled OpenMp option and only single core working. I have got 230 seconds +vs 160 seconds. Besides optimizing wisdom of FFT takes forever with OpenMP. + + +on a grid Time x Velocity = 10000 x 100 +with OpenMP execution time = 988 seconds +without = 1708 seconds + +with 4 thread +on a grid Time x Velocity = 10000 x 100 +with OpenMP execution time = 1036 seconds +without = 1603 seconds + |