topic Pablo, in Intel® Integrated Performance Primitives

ippiSqr function very slow

Pablo_N_ — Thu, 27 Sep 2012 08:08:30 GMT

Hi,

If I want to square an Ipp32f image I find that using ippiMul_32f_C1R is many times (~7x) faster than ippiSqr_32f_C1R.

I am evaluating a trial version ippIP AVX (e9) version: 7.1.0 (r36264).
I use:
Intel(R) Xeon(R) CPU E31235 @ 3.20GHz
KMP_AFFINITY=verbose,granularity=core,compact,0,0
1 packages x 4 cores/pkg x 2 threads/core (4 total cores)
gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)

I observe that ippiSqr uses more cores even with the affinity configuration above.

Thanks,
Pablo

Pablo,

Chuck_De_Sylva — Mon, 01 Oct 2012 18:50:50 GMT

Pablo, Do you have a code snippet that we could use to replicate this issue? That would help a lot. Thanks, Chuck

Pablo,

Gennady_F_Intel — Thu, 04 Oct 2012 05:20:55 GMT

Pablo, it might be because of ippiSqr_*_ is not threaded but ippiMul - is threaded. please check the perf results between these functions when link with serial version of IPP.