I’m not entirely sure what you are asking here. If you use oversubscribe, we do not bind your processes and you suffer some performance penalty for it. If you want to run one process/thread and retain binding, then do not use --oversubscribe and instead use --use-hwthread-cpus
> On Jun 6, 2018, at 3:06 AM, Mahmood Naderan <mahmood...@gmail.com> wrote: > > Hi, > On a Ryzen 1800x which has 8 cores and 16 threads, when I run "mpirun -np 16 > lammps..." I get an error that there is not enough slot. It seems that > --oversubscribe option will fix that. > > Odd thing is that when I run "mpirun -np 8 lammps" it takes about 46 minutes > to complete the job while with "mpirun --oversubscribe -np 16 lammps" it > takes about 39 minutes. > > I want to be sure that I "-np 16" uses are logical cores. Is that confirmed > with --oversubscribe? > > Regards, > Mahmood > > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users
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