Scyld performance problems
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Donald Becker becker at scyld.comMon Aug 5 10:48:03 PDT 2002
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On Mon, 5 Aug 2002, Tom A Krewson wrote: > I am having a performance problem with my Scyld Beowulf. What Scyld version? Scyld should have a MPI job start-up time that is 10-15X faster than a reference generic MPICH using 'rsh', DNS, and local executables. After start-up, runtime should be the same as MPICH (or GM-MPI for Myrinet). Most performance problems have been traced to Ethernet issues. Specifically, your switch should support multicast without dropping your switch should be set to autonegotation, not forced full duplex you may need to update your driver set, especially for some 3c905 NICs. > performance is even less at .09 Gflops. I have tried 3 different switches, > and the cheapest (I assume a cut through switch) gives the best > performance. This hints at a network problem. What does 'cat /proc/net/dev' report about errors? Note that for smaller clusters, inexpensive unmanaged switches perform better than expensive managed switches that try to interpret multicast traffic. -- Donald Becker becker at scyld.com Scyld Computing Corporation http://www.scyld.com 410 Severn Ave. Suite 210 Second Generation Beowulf Clusters Annapolis MD 21403 410-990-9993
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