[Beowulf] slightly [OT] smp boxes
patrick at myri.com
Mon Oct 20 02:36:21 PDT 2008
Greg Lindahl wrote:
> Submit one. HPCC isn't perfect, but it's the best that's available,
I disagree. The tests integration sucks and some of the tests themselves
are poorly written. For example, last time I looked, bench_lat_bw
measures *8* half-RTTs with MPI_Wtime(). If your MPI_Wtime() is not
using cycle counting instructions by default (which is not portable),
then you are screwed.
Getting the timing right is benchmarking 101.
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