[Gretl-devel] Re: mols() and multithreading

Am 28.01.2020 um 10:53 schrieb Marcin Błażejowski: >>> On 28.01.2020 09:18, Sven Schreiber wrote: >>>> 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?) >>>> > This is 'libopenblas-base:amd64 0.3.7+ds-7' which is transitional to (in > my case) 'libopenblas0:amd64 0.3.7+ds-7' which is meta package and true > one is 'libopenblas0-openmp:amd64 0.3.7+ds-7'. Then I don't see an obvious explanation why you get good performance with OMP_NUM_THREADS=4 and and I did not. When Allin upgraded to openblas 0.3.7 in the Windows snapshots this didn't change. Maybe some other compile options are still different?