[parsec-users] performance improvement for fluidanimate

Fedorova, Julia Julia.Fedorova at intel.com
Mon Jun 28 01:14:55 EDT 2010


Hi Chris, all

I have some performance improvement for fluidanimante application.

They are some small code changes in ComputeForces (in case of serial version) and in
ComputeForcesMT & ComputeDensitiesMT functions (in pthreads version)
that lead to ~ 18% speed up as measured for serial and pthreads, native input with 500 frames on Xeon Core i7 single socket platform.

Gcc-serial (indeed 1 thread):
Initial - 358.6 sec
Optimized - 293.4 sec

gcc-pthreads, 4 threads:
Initial - 109.7 sec
Optimized - 89 sec


It is related to excessive branch misprediction cost in the code and putting additional "if" upper by the code flow gives visible performance boost.

Although above numbers are for the intel platform - I believe the changes will bring benefit for other platforms/CPU also - as they minimize wasted work that created by branch misprediction.

Is there interest to such changes?
I will send the patches then.

Thanks

Regards, Julia Fedorova
Intel


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