[R-sig-hpc] Choosing Intel MKL BLAS when compiling R
nakama at ki.rim.or.jp
Wed Nov 2 17:06:46 CET 2011
> 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
EI-JI Nakama <nakama (a) ki.rim.or.jp>
"\u4e2d\u9593\u6804\u6cbb" <nakama (a) ki.rim.or.jp>
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