Am 28.01.2020 um 07:34 schrieb Marcin Błażejowski:
On 17.01.2020 12:13, Sven Schreiber wrote:
> I varied the environment variables OMP_NUM_THREADS and
> OPENBLAS_NUM_THREADS:
>
> OMP... OPENBLAS... best of 3 runs
> <unset/default> <unset/default> 6.4 s
> 4 4 6.4 s
> 4 1 6.4 s
> 1 4 2.9 s
> 1 1 2.9 s
>
>
Hi Sven again,
my machine is still: 4 Hyper-Threaded Core i7-8550U CPU @ 1.80GHz, but
this time we use new Allin's compiler/linker settings for Debian-like
system to force linking against OpenBLAS (0.3.7 + OpenMP).
My results:
OMP... OPENBLAS... best of 3 runs
<unset/default> <unset/default> 2.067
4 4 2.83
4 1 2.83
1 4 2.81
1 1 2.80
------------------------------------------
8 8 2.86
8 4 2.81
4 8 2.86
8 1 2.81
1 8 2.87
------------------------------------------
Thanks Marcin, that's looking very good! I guess you're using current
git for that?
But openblas alone doesn't explain the equality of the 4-thread and the
single-thread outcome, at least comparing to the Windows results. Or did
you compile openblas yourself? (Perhaps with a different dgemm threshold?)
thanks
sven
I'm attaching shell script to run test for all possibilities.
Cheers,
Marcin
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