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Subject: Re: A "mystery" with dual core

Author: Premraj Natarajan

Date: 10:22:45 11/02/05

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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



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