On Sun, Jun 29, 2008 at 02:30:54AM +0400, Mikhail Kuzminsky wrote: > (BTW, there is one bad thing for stream on this server - the > corresponding data are absent in McCalpin's table: the throughput is > scaled good from 1 to 2 OpenMP threads, and gives good result for 8 > threads, but the throughput for 4 threads is about the same as for 2 > threads. The reason is, IMHO, that for 8 threads RAM is allocated by > kernel in both nodes, but for 4 threads the RAM allocated is placed in > one node, and 4 threads have bad competition for memory access).
Er, this is not a general result, but is a function of your OpenMP implementation. We just discussed it a couple of days ago, right here. -- greg _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
