Yes, very strange. I tested it with Intel MPI and ParastationMPI, both available on the cluster. Output log I sent may show something interesting (?)
Best, Damian W dniu 19 cze 2017, 19:53, o 19:53, użytkownik Satish Balay <[email protected]> napisał: >MPI=16 OMP=1 time=45.62. > >This timing [without OpenMP] looks out of place. Perhaps something >else [wierd MPI behavior?] is going on here.. > >Satish > >On Fri, 16 Jun 2017, Damian Kaliszan wrote: > >> Hi, >> >> For several days I've been trying to figure out what is going >wrong >> with my python app timings solving Ax=b with KSP (GMRES) solver when >trying to run on Intel's KNL 7210/7230. >> >> I downsized the problem to 1000x1000 A matrix and a single node >and >> observed the following: >> >> >> I'm attaching 2 extreme timings where configurations differ only by 1 >OMP thread (64MPI/1 OMP vs 64/2 OMPs), >> 23321 vs 23325 slurm task ids. >> >> Any help will be appreciated.... >> >> Best, >> Damian >>
