topic I forgot to say that my in Intel® Moderncode for Parallel Architectures

linking with two versions of mkl (multi threaded and single threaded) in one application

Michal_K_2 — Wed, 11 Feb 2015 22:39:54 GMT

Hi,

Is it possible to use both the single threaded version of mkl library and the multi threaded version of mkl in one application?

I need the single threaded version to use with PLASMA library, yet at some other part of my code, I need use mkl PARDISO, for which I need the multi threaded version.

Any help will be greatly appreciated.

Cheers

Michal

I forgot to say that my

Michal_K_2 — Thu, 12 Feb 2015 16:51:34 GMT

I forgot to say that my operating system is Linux, debian wheezy.

I was able to fix the problem

Michal_K_2 — Thu, 12 Feb 2015 19:38:00 GMT

I was able to fix the problem, by lining PLASMA with the multi threaded mkl. The crucial thing was to set

call kmp_set_defaults("KMP_AFFINITY=disabled")

which makes PLASMA with multi threaded mkl only 2% slower than PLASMA with single threaded mkl. Without this option it is 3 times slower.

It means that I do not need to link to the single threaded library anymore.

If each is establishing its

jimdempseyatthecove — Sat, 21 Feb 2015 13:57:05 GMT

If each is establishing its own thread pool, then experiment with KMP_BLOCKTIME environment variable settings or KMP_SET_BLOCKTIME function.

Jim Dempsey