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Subject: Re: PONDER=ON and TableBases on 1 PC

Author: Uri Blass

Date: 01:06:42 07/28/01

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On July 28, 2001 at 02:49:56, Dann Corbit wrote:

>On July 28, 2001 at 02:21:06, Terry McCracken wrote:
>[snip]
>>
>>>I copied the wrong post Dan! He does say one machine!
>>
>>*Hyatt/Quote "Nope... no joke at all.  Two programs, one machine, my preference
>>is ponder=on.
>>>>>>>>both will get 1/2 of the machine and the time controls won't be screwed up."
>>
>>Wrong.  That's clearly two machines.  Let me pull out the relevant part so you
>>>>can take a gander:
>>>>
>>>>"... I ran a test, gnuchess on a single-cpu, vs crafty on a quad pentium-pro
>>>>200, but using only one cpu."
>>>>
>>>>Clearly, he is talking about two different machines
>>
>>Yes here he is clearly talking about two machines.
>>
>>But the quote above is _one_ machine.
>
>Surely (in that case) he is talking about a two-cpu machine.  He has a machine
>with 4 CPU's on it.
>
>I have accidentally ran two programs in ponder on a single CPU machine.  Not
>only do they both get blasted, but one is usually better at stealing cycles and
>gets 70-80% of the CPU.

It may be possible to prevent this problem by having a program that does not
allow one engine to steal cycles.

I understood that the chessbase interface tries to do it and if I understand
correctly it does it better at longer time control(I never tried it so I do not
know).

Uri



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