RhpcBLASctl-package: Control the number of threads on BLAS

Description

Control the number of threads on 'BLAS' (Aka 'GotoBLAS', 'ACML' and 'MKL').

If you build R directly on Windows and the BLAS file name is not 'Rblas.dll', you can give it as 'options ("RhpcBLASctl.win.Rblas.name" = "boofoo.dll")'.

openmp-related functions only work at build-time instructions. Omp_get * now returns NA_Integer if R was not built with openmp instructions. NOTE: if R itself is built without OpenMP instructions and BLAS thread is used with OpenMP, this package will not work...XD

Usage

get_num_cores()
get_num_procs()
blas_get_num_procs()
blas_set_num_threads(threads)
omp_get_num_procs()
omp_get_max_threads()
omp_set_num_threads(threads)

Value

get_num_cores: Number of CPU physical processor. NOTE:Returns 1L if unknown
get_num_procs: Number of CPU logical processor. NOTE:Returns 1L if unknown
blas_get_num_procs: Number of available cores for the optimized BLAS. NOTE:Returns 1L if unknown
omp_get_num_procs: Result from OpenMP's omp_get_num_procs function. NOTE Returns NA_integer_ if unknown
omp_get_max_threads: Result from OpenMP's omp_get_max_threads function. NOTE Returns NA_integer_ if unknown

Arguments

threads: Number of threads

Author

Junji NAKANO <nakanoj@ism.ac.jp> and Ei-ji Nakama<nakama@com-one.com> Maintainer: Ei-ji Nakama <nakama@com-one.com>

Details

https://prs.ism.ac.jp/~nakama/Rhpc/

Examples

Run this code

get_num_cores()
get_num_procs()
blas_get_num_procs()
blas_set_num_threads(2)
omp_get_num_procs()
omp_get_max_threads()
omp_set_num_threads(2)

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