Author: Keith Evans
Date: 14:17:43 04/11/03
Go up one level in this thread
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.) > >You should thank me, Bob. Your hands must be really tired from all that waving. > >-Tom Could you run Crafty with 1 thread, and then two threads and see what improvement it gets due to hyperthreading? Bob supplied some scripts to run his test in an earlier post.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.