topic Re: multithreading in ipp in Intel® Integrated Performance Primitives

multithreading in ipp

weberh — Tue, 29 Mar 2005 00:00:25 GMT

While it is good that IPP's internal multithreading can be disabled via the static libraries, it is somewhat awkward and defeats the purpose of dlls. The 4.1.2 release notes mention that libguide can be used to disable multithreading, but a message-board message regarding this feature seems to contradict that, and, in any case, I don't think this feature is available on the windows platform.

Given that un-threaded versions of the functions are available in the static libs, why not offer developers a run time switch to disable threading in the dll version?

Thanks,

Hans

Re: multithreading in ipp

Vladimir_Dudnik — Wed, 30 Mar 2005 02:47:53 GMT

Hi,

in IPP v 4.1 youare able to limit number of OMP threads to 1 by setting environment variable OMP_NUM_THREADS=1. It means no additional threads will be created inside IPP functions. In the next IPP versions it will be possible to set number of internal threads with special IPP function.

Regards,

Vladimir

Re: multithreading in ipp

Ying_S_Intel — Fri, 08 Apr 2005 12:58:47 GMT

Additional information for IPP and threading/OpenMP topic can be found at Intel IPP support site at:

http://support.intel.com/support/performancetools/libraries/ipp/sb/cs-010662.htm

Thanks,
Ying S
Intel IPP