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

Author: Jasmine Baer

Date: 07:42:37 01/02/04

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On January 02, 2004 at 10:35:40, Luis Smith wrote:

>On January 02, 2004 at 10:31:23, Jasmine Baer wrote:
>
>>On January 02, 2004 at 10:21:48, Luis Smith wrote:
>>
>>>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.
>>>
>>>No need, someone has already run this test.  Click on "Winboard" and then
>>>"Ponder Experiment" on the side
>>>
>>>http://www.pittlik.de/winboard.html
>>
>>Am I reading the time control corrctly?  60+2 meaning 60 minutes plus 2 seconds
>>per move?  The reason I ask is because above the tables, there are links to some
>>downloads - 1320 Lightning Games etc., etc.  60 minutes + 2 sec/move is not a
>>lightning time control.  Could I be misinterpreting the 60+2?  Should I be
>>thinking that 60+2 means 60 seconds plus 2 seconds per move?
>
>60 seconds with 2 second increments.

Then it makes sense that ponder on/off doesn't make any statistical difference.
The computer hardly has time to think under that time control.  I'm guessing
that the longer the time control, the more influence ponder on/off has.



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