[Gretl-devel] Re: mols() and multithreading
Hi
on a workstation where the installed blas library seems to be netlib (as
in Marcin's case) using an old Ubuntu 14.04 version with gretl 2019b or
so, I obtain:
2 x Intel Xeon CPU E5-2650 v3 @ 2.30GHz with
Each core has 10 pyhiscal cores and 20 threads
OMP_NUM_THREADS
best of 3 runs
1
15.26
5
8.66
10
6.78
20
5.72
25
6.28
30
6.42
40
9.13
Artur
Am 23.01.20 um 09:13 schrieb Sven Schreiber:
Am 23.01.2020 um 07:07 schrieb Marcin Błażejowski:
> OpenBLAS witn OpenMP. But 'eval $sysinfo' produces following results:
>
> bundle anonymous:
> ncores = 4
> mpi = 1
> omp = 1
> hostname = "marcin-note"
> os = "linux"
> omp_num_threads = 4
> mpimax = 8
> blas = "netlib"
Ah OK, I guess that also explains the relatively slow timings on your
modern CPU.
> I remember that previous version of OpenBLAS either taken from repos or
> compiled by myself was giving (among others):
>
> blas = openblas
> blas_parallel = OpenMP
>
> I'm stuck.
Sorry, can't really help here. Maybe uninstall other pure Lapack/Netlib
packages so they cannot interfere?
thanks
sven
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