Author: Martin Baumung
Date: 10:02:36 11/22/04
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On November 22, 2004 at 11:23:53, Robert Hyatt wrote: >On November 22, 2004 at 10:48:02, Steve Maughan wrote: > >>I have a relatively new machine that has a P4 with Hyperthreading. I've >>recently installed Shredder 8 and Gandalf 6. When playing a match I switched to >>the Task Manager to look at the memory usage and noticed that when Gandalf was >>thinking, according to the TM, it was only using 50% of the CPU while Shredder 8 >>was using 100% (both had Ponder = off). On further investigation Shredder was >>using 2 threads in the engine. Looking at the speed, both were getting >>approximately the same nps which is inline with other machines I have tested >>them on. >> >>So the question is - does the Task Manager report the CPU resource usage >>incorrectly in this situation i.e. 50% = 100% usage of 1 processor? I'm >>reasonably sure that this is the case but wanted to check. >> >>Thanks, >> >>Steve Maughan > > >It is difficult for _any_ program to figure out what is going on, since >hyper-threading makes the O/S think there are two equal CPUs, when there really >is not... for engine vs engine you should turn it off in the BIOS... maybe a silly question, but why should one turn HT off - at least for engine matches without pondering? So far I didn't encounter any problems. I've only tried Shredder 8, but it gets a few extra nps with HT. Cheers, Martin
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