[Gretl-devel] Re: MPI and OpenMP (and openblas?)
On Fri, 17 Jan 2020, Sven Schreiber wrote:
Am 17.01.2020 um 10:11 schrieb Sven Schreiber:
> Am 16.01.2020 um 17:42 schrieb Allin Cottrell:
>
> > In light of Sven's account I wondered whether this libgomp-level
> > setting was not "getting through" to the openblas library, but in my
> > testing it appears to be working fine. Nonetheless, I've added a call
> > to openblas_set_num_threads() just in case that makes a difference on
> > some systems.
>
> openblas_set_num_threads(1) is indeed one of the recommended ways
> (https://github.com/xianyi/OpenBLAS/wiki/faq#multi-threaded)
P.S. On the main page https://github.com/xianyi/OpenBLAS it says about
environment settings:
The priorities are OPENBLAS_NUM_THREADS > GOTO_NUM_THREADS >
OMP_NUM_THREADS.
If openblas is built with OpenMP support, only the last of these
environment variables has any effect.
Allin