On Fri, Apr 10, 2009 at 05:10:29PM -0400, Jeff Squyres wrote: > On Apr 7, 2009, at 4:25 PM, Mostyn Lewis wrote: > > >Does OpenMPI know about the number of CPUS per node for FreeBSD? > > > > This is exactly the right question: apparently it does not. > > Specifically, it looks like we have a bad configure test in the > "posix" paffinity component which triggers it to not be built. Hence, > OMPI *always* thinks there's only 1 processor. > > The setup for how to get the number of processors was totally changed > between the 1.2 and 1.3 series. I think that this completely explains > the issue (OMPI didn't have a paffinity component, so it assumed 1 > processor, then it saw that there were 2 processes running, and > therefore decided that it was running in oversubscribed mode). > > I'll fix. I don't know if it'll make the cut for 1.3.2 or not. >
Thanks for looking into this issue. As a side note, FreeBSD 7.1 and higher has the cpuset_getaffinity/cpuset_setaffinity system calls. I suspect that at some point openmpi can have a opal/mca/paffinity/freebsd directory with an appropriate set of paffinity_* files. -- Steve
