On Thu, Mar 26, 2009 at 11:32:23PM -0400, Dow Hurst DPHURST wrote: > We've got a couple of weeks max to finalize spec'ing a new cluster. Has > anyone knowledge of lowering latency for NAMD by implementing a > multi-rail IB solution using MVAPICH or Intel's MPI?
Multi-rail is likely to increase latency. BTW, Intel MPI usually has higher latency than other MPI implementations. If you look around for benchmarks you'll find that QLogic InfiniPath does quite well on NAMD and friends, compared to that other brand of InfiniBand adaptor. For example, at http://www.ks.uiuc.edu/Research/namd/performance.html the lowest line == best performance is InfiniPath. Those results aren't the most recent, but I'd bet that the current generation of adaptors has the same situation. -- Greg (yeah, I used to work for QLogic.) _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
