Author: Robert Hyatt
Date: 07:09:27 01/13/04
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On January 13, 2004 at 10:02:14, Jasmine Baer wrote: >Hello. > >Time for another question about the effects of hyperthreading (Intel P4) on >chess engine performance. > >One of Shredder's parameters allows 1 or two threads. It defaulted to 2 >threads, so when I was playing a game, I noticed that my CPU utilization was at >or very near 100% during the game. If I set the number of threads to 1, >utilization is more similar to my other chess engines - hovering at, or slightly >above 50%. > >Because running two threads pushes CPU utilization to 100%, my CPU runs a bit >hotter. After a 5 minute blitz game with 2 threads, I get readings of 51-52 >degrees Celsius, whereas if I run with only 1 thread, I get readings that are >about 2-3 degrees lower at the end of the game. > >Does running Shredder with 2 threads on a Hyperthreading Intel P4 processor (2.8 >Ghz) increase Shredder's strength? If it does, I can see running it with two >threads, but if it doesn't make the engine stronger, why make the CPU run 2-3 >degrees hotter? > >Thanks for any feedback anyone can provide. > >-JTB > >PS - I can run my own tournaments to see how Shredder performs with 1 thread or >2 threads, but I was hoping some of you out there have already done something >similar and have reached a conclusion that you can share with me. First, I can't imagine why you are worrying about 2-3 degrees. 20-30 might be more interesting. Second, why not set up a position on Shredder, and run it to a fixed search depth. Use 1 thread, then 2 threads and see which is faster. That will answer your question.
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