Author: Matthew White
Date: 13:53:57 05/24/03
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On May 23, 2003 at 23:40:23, Aaron Gordon wrote: >>What are they measuring? >> >>IE running two copies _should_ see each copy run about 1/2 as fast with SMT >>on, since each copy is getting roughly 50% of available cpu core resources >>when running the same instruction streams. >> >>Or do you mean something else? > >It's keys per second for RC5, nodes per second for OGR. What I mean is it spawns >1 thread per processor (or virtual processor in HT's case). >My Dual Celeron 400MHz box gets an exact 2.00x speedup with this, I'm assuming >because it doesn't hit the main memory at all. Any other dual processor system >should also get a 2.00x speedup as well.. however I saw some results that were >puzzling. Here they are... > >Dual Xeon (P4) 2.0GHz without HT - 2.8 million keys/sec per thread (5.6mk/s >total), 2 threads total. > >Dual Xeon (P4) 2.0GHz with HT enabled - 0.72 million keys/sec per thread >(2.88mk/s total), 4 threads total. > >I was just wondering if you could run the same tests and confirm this. I would >have figured RC5/OGR would have managed a nice boost from HT, so it's surprising >to me. I have seen similarly poor performance on my Dual Xeon 2.4 GHz with HT enabled. I manually configured the client to only spawn 2 threads. Matt
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