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 >
