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Subject: Re: Intel Hyperthreading and Ponder (Permanent Brain)

Author: Anthony Cozzie

Date: 08:05:41 01/02/04

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On January 02, 2004 at 09:57:38, Jasmine Baer wrote:

>I've seen it written that under the following conditions:
>
>1.  Engine vs. Engine match or tournament
>2.  Held on a single computer with a single processor
>
>having ponder=ON(or Permanent Brain in the Fritz GUI) will impact the play of
>the engines since the each individual engine would not have full access to the
>processor during its own turn.
>
>First, is this true?
>
>Second, is this issue, if it actually is an issue, something that is eliminated
>by running a two-processor system?
>
>And, finally, does anyone have any solid insight on how ponder=off/on or
>Permanent Brain works on a Pentium 4 with Hyperthreading?
>
>Thanks.

Ponder means that the engine thinks while its opponent moves.  Since there is
only 1 cpu, and both engines are thinking, they get half the cpu.

HT is garbage for computer chess.  A pentium 4 is ONE core.  HT is designed for
applications that spend most of their time in the memory system.

anthony



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