[Beowulf] slightly [OT] smp boxes

Patrick Geoffray patrick at myri.com
Mon Oct 20 05:36:21 EDT 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.

Beowulf mailing list, Beowulf at beowulf.org
To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf

More information about the Beowulf mailing list