On Thu, Mar 05, 2009 at 09:41:55AM -0500, Scott Atchley wrote: > Generally, I would not want to limit my MPI to TCP and IO to MX > especially if my TCP is over gigabit Ethernet. Unless your IO can exceed > the link rate, there will be plenty of bandwidth left over for MPI and > your latency will stay much lower than TCP.
I think that's great advice. On our old GM cluster, I ran benchmarks whose only non-io MPI calls were "wtime" and "barrier", so MPI-over-tcp wasn't a big deal :> > What is PAV? It's a collection of perl scripts that let you set up scratch pvfs volumes. PBS gives you a bunch of nodes, then you use PAV to set up servers on some of them and make the others clients. You can find it in ./test/common/pav if you're curious. ==rob -- Rob Latham Mathematics and Computer Science Division A215 0178 EA2D B059 8CDF Argonne National Lab, IL USA B29D F333 664A 4280 315B _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
