Author: Vincent Diepeveen
Date: 19:44:09 04/12/03
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On April 11, 2003 at 16:53:59, Tom Kerrigan wrote: >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.) I do not see why this is contrary to my assumption. What i see is that SMT improves nps with say 15%. How that is divided between the 2 processes i didn't write down anything about here. It is logical that it is about 50-50 there. Whether that is caused by processor switches from windows, or by the hardware itself, that's not very interesting to me. My assumption is hardware for now though. >You should thank me, Bob. Your hands must be really tired from all that waving. > >-Tom
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