Correction: I meant to say > 100usec instead of 100msec in the subject line
On Fri, Aug 8, 2008 at 12:14 AM, Rajouri Jammu <[EMAIL PROTECTED]>wrote: > Hi, > I modified/instrumented the OSU MP latency benchmark to measure time taken > by each transaction in order to get min and max latencies, in addition to > the average that's reported currently. > I noticed that some of the transactions, albeit few, took > 100usec and > > 1msec. > > Does anybody have any ideas about what could be causing such large round > trip times (>1msec) for a few transactions while the average looks pretty > good ( 10usec ranges) ? > Is it network or system issues? > > Here is a snapshot of the output and attached is the modified code. > > i'm using OFED 1.3, CentOS 5 and openmpi-1.2.5. > > Any insights or ideas would very helpful. Thanks in advance. > > Below shows # of transactions over 100usec and 1msec. > Iteration count was set to 60000 for each test. > Latency is round trip time. > > -------------------------------------------------------------------------- > # OSU MPI Latency Test v3.0 > # Size Latency (us) > 0 13.30 over_100usec: 13 over_1msec: 2 i 601000 > 1 13.51 over_100usec: 12 over_1msec: 0 i 601000 > 2 13.51 over_100usec: 13 over_1msec: 1 i 601000 > 4 13.81 over_100usec: 42 over_1msec: 33 i 601000 > 8 13.92 over_100usec: 36 over_1msec: 25 i 601000 > 16 13.90 over_100usec: 10 over_1msec: 0 i 601000 > 32 14.14 over_100usec: 54 over_1msec: 44 i 601000 > 64 14.32 over_100usec: 11 over_1msec: 1 i 601000 > 128 15.38 over_100usec: 10 over_1msec: 0 i 601000 > 256 15.94 over_100usec: 14 over_1msec: 2 i 601000 > 512 16.74 *over_100usec: 77 over_1msec: 65 *i > 601000 > 1024 21.07 over_100usec: 17 over_1msec: 0 i 601000 > 2048 24.05 over_100usec: 17 over_1msec: 1 i 601000 > 4096 29.99 over_100usec: 37 over_1msec: 5 i 601000 > 8192 41.71 over_100usec: 39 over_1msec: 0 i 601000 > > > > >
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