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Subject: Re: Hyper Threading and Chess

Author: Frank Phillips

Date: 05:36:14 12/31/02

Go up one level in this thread


On December 30, 2002 at 23:38:08, Matt Taylor wrote:

>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.

A licence restricts the configuration of the machine you can run the software on
that you bought - incredible.


>
>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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