[R-sig-hpc] Choosing Intel MKL BLAS when compiling R

[Jonathan Greenberg]

So if I'm following all this correctly, Intel MKL BLAS cannot be used
as a "swap-in" for R like GotoBLAS or Atlas, but it CAN be used during
the compilation phase as the hard-coded BLAS used?

Incidentally, I switched over to OpenBLAS from GotoBLAS last year and
have been happy with it -- it actually solved some compilation issues
that GotoBLAS had (also, it appears the configuration phase is a lot
faster).

--j

On Wed, Nov 2, 2011 at 9:06 AM, Ei-ji Nakama <nakama at ki.rim.or.jp> wrote:
>>    o configure looks for support for OpenMP and if found compiles R
>>      with appropriate flags and also makes them available for use in
>>      packages: see 'Writing R Extensions'.
>
> When people make by default option in GotoBLAS for Linux,
> it raise a thread at the time of the initialization of the library
> and set affinity.
> Therefore openmp will not cause a thread.
>
> The good method should control the number of the threads in
> omp_set_num_threads and goto_set_num_threads.
> !!!must perform this!!!
> performance when there is a part to use the thread for elsewhere is the worst
>
> MKL thinks that KMP_AFFINITY=verbose helps analysis.
>
> and ... people remove the number of the CPU's of the hyper thread in
> BLAS and should carry it out.
> # BLAS may count the number of the cores precisely partly.
>
> I wrote regret it in strange English.XD
>
> Best Regards,
> --
> EI-JI Nakama  <nakama (a) ki.rim.or.jp>
> "\u4e2d\u9593\u6804\u6cbb"  <nakama (a) ki.rim.or.jp>
>
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-- 
Jonathan A. Greenberg, PhD
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Department of Geography
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