Author: Tom Kerrigan
Date: 13:53:59 04/11/03
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On April 11, 2003 at 10:58:29, Robert Hyatt wrote: >I have explained "why not" before. > >My configuration is a dual 2.8. I can't remove a CPU because I don't have a >terminator to >stick in the socket. So I am stuck with two. I can enable or disable SMT when >I boot the >machine. > >now tell me how to run the test. Two copies might run on one physical cpu >(using two >logical cpus). Or they might run on two physical cpus. I have no control over >that. And >they will bounce around between processors as they run. > >Your turn. Tell me how to run a valid test and I'll let 'er rip. Actually a friend of mine has access to a P4/3.06 and I ran the test myself. Took less than 5 minutes. I opened two instances of my program and had them search the same position simultaneously and compared their NPS after ~10 seconds. I did this three times. Task Manager showed that both logical processors were pegged. The NPS ratios were: 51%-49% 49%-51% 48%-52% It's pretty darn obvious that HT does not favor one logical processor more than another. (Contrary to Hyatt and Vincent's assertions.) You should thank me, Bob. Your hands must be really tired from all that waving. -Tom
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