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Subject: Re: A "mystery" with dual core

Author: Gregory Owett

Date: 10:55:32 11/02/05

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On November 02, 2005 at 13:22:45, Premraj Natarajan wrote:

>On November 02, 2005 at 10:57:35, Gregory Owett wrote:
>
>>Recently, I launched two tournaments (ponder off) with the same participants, on
>>two different machines.  Here results:
>>
>>On P4 2.2 T=15'+5" :
>>
>>1. Fruit 2.2.1 KS104     7,5 / 10
>>2. Shredder 9 UCI        5,5
>>3. Shredder 7.04 CLm1    5            25,00
>>4. Fruit 2.2.1 Uri       5            23,00
>>5. Shredder 8 CLD        3,5          17,25
>>6. Fruit 2.2.1           3,5          16,50
>>
>>
>>On AMD x2 dual core 4800+   T=15'+5" :
>>
>>1. Shredder 8 CLD        6,5 / 10
>>2. Fruit 2.2.1 Uri       6
>>3. Fruit 2.2.1 KS104     5            25,75
>>4. Fruit 2.2.1           5            24,25
>>5. Shredder 9 UCI        4,5
>>6. Shredder 7.04 CLm1    3
>>
>>
>>The success of Shredder 8 CLD (UCI) on the dual core machine, confirms what the
>>task manager indicated, i.e. which Shredder 8 CLD, in spite of it is
>>single-threaded engine, used 99% of the two processors, while all the others
>>used 50%, in other words, only one processor.
>>
>>(Native engines, as F8, J9, H9, CT15 etc...use 99% too.)
>>
>>Peter Kasinski thinks that Windows task manager is confused and carryforwards
>>incorrectly.
>>
>>Is there another explanation?
>>
>>Gregory
>
>It is true that Shredder 8 isnot Deep engine that doesnot mean it is single
>threaded engine while it is using 2 threads, Shredder 8 is itself a Deep engine
>or u might call it multi threaded so we find shredder 8 would have been running
>2 times faster in dual core and hence played better.
>
>Prem

Yes, it is my opinion too.

Gregory



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