Author: John Roberts
Date: 06:40:35 01/15/04
Go up one level in this thread
On January 13, 2004 at 10:20:30, Jasmine Baer wrote: >On January 13, 2004 at 10:09:27, Robert Hyatt wrote: > >>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. > >I will go home after work and load up the test set that comes with the Chessbase >engines. I'll run it with 1 thread and then 2 threads. That should provide >enough info to see what the effect of the additional thread is. > >As far as the temperature goes, the cooler I can keep the processor, the happier >I am. Don't really know why - I just like to see how cool I can keep it when >running at a full load. An odd obsession, I guess. This would be a nice thread for CTF, I usually try to wipe my bum bum using 3 or 4 sets of 4 squares, but it depends on what I ate. Sorry, I couldn't resist. :)
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