P.s. I should have said this this is a pretty course-grained application, and netstat doesn't show much communication going on (except in stages).
On 3/21/07 4:21 PM, "Heywood, Todd" <heyw...@cshl.edu> wrote: > I noticed that my OpenMPI processes are using larger amounts of system time > than user time (via vmstat, top). I'm running on dual-core, dual-CPU > Opterons, with 4 slots per node, where the program has the nodes to > themselves. A closer look showed that they are constantly switching between > run and sleep states with 4-8 page faults per second. > > Why would this be? It doesn't happen with 4 sequential jobs running on a > node, where I get 99% user time, maybe 1% system time. > > The processes have plenty of memory. This behavior occurs whether I use > processor/memory affinity or not (there is no oversubscription). > > Thanks, > > Todd > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
