Re: [Starpu-devel] StarPU and MKL 11 (Intel Composer XE 2013)

[Nathalie Furmento <nathalie.furmento@labri.fr>]

Thanks Benoit for your feedback.

I added your explanation in the documentation.

Cheers,

Nathalie

On Jun 17, 17:54, Benoît Lizé wrote:
> Hello,
> 
> I recently talked off-list with some of you about some issues with MKL 11
> and StarPU.
> I'm using StarPU (1.1rc1 and 1.0.5) on Linux with MKL, using 1 thread for
> MKL and doing all the parallelism using StarPU (no multithreaded tasks),
> setting MKL_NUM_THREADS to 1.
> The threaded MKL library is used, with iomp5.
> 
> Using this configuration, StarPU used only 1 core, no matter the value of
> STARPU_NCPU. Samuel mentionned that it looked like a thread pinning issue
> with MKL.
> 
> I think I've found the solution: setting KMP_AFFINITY to disabled (
> http://software.intel
> .com/sites/products/documentation/studio/composer/en-us/2011Update/compiler_c/
> optaps/common/optaps_openmp_thread_affinity.htm). I wanted to share this
> workaround here.
> 
> -- 
> Benoit Lize

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