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Subject: Re: Hyper Threading and Chess

Author: Matt Taylor

Date: 20:38:08 12/30/02

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On December 30, 2002 at 22:13:43, Robert Hyatt wrote:

>On December 30, 2002 at 19:39:23, Frank Koenig wrote:
>
>>Two questions.
>>
>>One) Will Intel's HT technology be able to help chess programs above and beyond
>>just allowing one CPU to appear as two?
>>
>>Second) If you are running XP, will HT require XP Pro instead of XP Home to take
>>advantage of it?
>>
>>Thanks,
>>
>>Frank
>
>
>I can't answer the last question....  As to the first, you can expect a parallel
>searcher to run 20-30% faster using two "virtual cpus" than using one real cpu.
>
>YMMV depending on the program however, as my numbers are numbers produced only
>by Crafty on a 2.8ghz xeon...

I can't really answer the last question either, but I will speculate anyway
(because it's fun). I checked the license agreement for Windows XP Professional,
and it only says that it is licensed for up to 2 processors. It makes no mention
of physical/logical processors, so presumably it will run either with SMP or HT.

I thought Windows XP Home supported 2 processors as well, but I only have 2
boxes with Windows (including my work PC) and both run XP Professional.

-Matt



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