>> >> desktop (32 bit PCI) cards. I managed to get 14.6 HPL GFLOPS >> >> and 4.35 GROMACS GFLOPS out of 8 nodes consisting of hardware >> > ... >> >> As a point of reference, a quad opteron 270 (2GHz) reported >> >> 4.31 GROMACS GFLOPS. >> > >> > that's perplexing to me, since the first cluster has semp/2500's, >> > right? that's a 1.75 GHz K8 core with 128K L2 and 64b memory >> > interface. versus the same number of 2.0 GHz, 1M cores each with >> > 4x 128b memory. I really wouldn't expect them to be that close - >> > any speculation on why GROMACS runs so poorly on the much better >> > SMP machine? >> >> <googling for motherboard specs> >> Aha, Socket 462. The Semprons he used are K7 based. > > OK, even more so - how does an even older cpu with lower clock, > slower memory and only gigabit interconnect beat a quad-opt. > it seems like some other factors were determining performance.
Well I cannot speak for how the quad opteron ran the code. All I went by was the number reported on the GROMACS page. I am curious myself. BTW, I recently tested GROMACS on a 3.2G PentD Presler (7.57 GFLOPS on 8 processors with one core each, 10.84 GFLOPS on 8 processors with two cores each - 16 cores total) White paper is forthcoming. -- Doug > > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf > -- Doug _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
