[R-sig-hpc] RhpcBLASctl: turn off restriction of BLAS/OMP threads

[Ei-ji Nakama]

Hi,

# save orignal threads
old_max_threads <- omp_get_max_threads()
old_blas_threads <- blas_get_num_procs()

# Control number of threads
omp_set_num_threads(1)
blas_set_num_threads(1)

# Work of purpose
boofoo()

# Restore the settings
omp_set_num_threads(old_max_threads)
blas_set_num_threads(old_blas_threads)

get_num_procs is not good if operated at under the PBS(etc...)

2016-05-10 10:20 GMT+09:00 Scott Ritchie <sritchie73 at gmail.com>:
> Hi all,
>
> I have written a function where I restrict the number of BLAS and OpenMP
> threads to 1 using the functions available in the `RhpcBLASctl` package:
>
> ```
> omp_set_num_threads(1)
> blas_set_num_threads(1)
> ```
>
> I would like to revert this at the end of the function so that calls to
> BLAS from other functions/packages are unaffected by this, but I could not
> find documentation on the correct way to do this.
>
> Is:
>
> ```
> omp_set_num_threads(NULL)
> blas_set_num_threads(NULL)
> ```
>
> Correct? Or should I be setting the number of threads to the number of
> logical processors, i.e. `get_num_procs()`?
>
> Thanks,
>
> --
> Scott Ritchie,
> Ph.D. Student | Integrative Systems Biology | Pathology |
> http://www.inouyelab.org
> The University of Melbourne
> ---
>
>         [[alternative HTML version deleted]]
>
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-- 
Best Regards,
--
Eiji NAKAMA <nakama (a) ki.rim.or.jp>
"\u4e2d\u9593\u6804\u6cbb"  <nakama (a) ki.rim.or.jp>