Author: Aaron Gordon
Date: 22:18:21 05/23/03
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On May 24, 2003 at 01:15:11, Robert Hyatt wrote: >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'll give it a run next week. I have to be present at the office to turn >SMT on/off and reboot, so I can't do it from home, remotely... Excellent, thanks.
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