On 21 Oct 2010, at 16:50 , Carsten Kutzner wrote: > On Oct 21, 2010, at 4:44 PM, Sander Pronk wrote: > >> >> Thanks for the information; the OpenMPI recommendation is probably because >> OpenMPI goes to great lengths trying to avoid process migration. The numactl >> doesn't prevent migration as far as I can tell: it controls where memory >> gets allocated if it's NUMA. > My understanding is that processes get pinned to cores with the help of > the --physcpubind switch to numactl, but please correct me if I am wrong. >
The documentation isn't clear on that: you bind a process to a set of cores, but that wouldn't necessarily mean that threads that belong to that process are bound to a specific core. They might be allowed to migrate within the set that you give the process. -- gmx-users mailing list gmx-users@gromacs.org http://lists.gromacs.org/mailman/listinfo/gmx-users Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/Search before posting! Please don't post (un)subscribe requests to the list. Use the www interface or send it to gmx-users-requ...@gromacs.org. Can't post? Read http://www.gromacs.org/Support/Mailing_Lists
