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openmp directives

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Mark Borgerding
2008-08-22 21:43:25 +00:00
parent 262fe2297b
commit 3df04c8671
7 changed files with 50 additions and 11 deletions
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@ -1,4 +1,8 @@
Speed:
* If you want to use multiple cores, then compile with -openmp or -fopenmp (see your compiler docs).
Realize that larger FFTs will reap more benefit than smaller FFTs. This generally uses more CPU time, but
less wall time.
* experiment with compiler flags
Special thanks to Oscar Lesta. He suggested some compiler flags
for gcc that make a big difference. They shave 10-15% off
@ -12,7 +16,7 @@ Speed:
* If you can rearrange your code to do 4 FFTs in parallel and you are on a recent Intel or AMD machine,
then you might want to experiment with the USE_SIMD code.
Reducing code size:
* remove some of the butterflies. There are currently butterflies optimized for radices