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Subject: Re: One more post on Ruffian 2.0 (scalability)

Author: Robert Hyatt

Date: 20:42:14 12/19/03

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On December 19, 2003 at 16:44:10, Uri Blass wrote:

>On December 19, 2003 at 16:20:32, Matthew Hull wrote:
>
>>On December 19, 2003 at 06:21:26, Djordje Vidanovic wrote:
>>
>>>As I had been away from my computer for a while, I only read the long threads
>>>regarding Ruffian 2.0 last night.  I feel obliged to give some new information
>>>regarding the thread and the advertisement in which Ruffian 2.0 is labelled as
>>>the strongest Winboard engine available.
>>
>>If one does not ingore scalability features, Crafty is the strongest Winboard
>>engine available, and potentially, depending on the hardware, the strongest
>>engine available, period.
>>
>>[snip]
>
>On what hardware?
>
>Shredder also can use more than one processor and I do not know if Crafty can
>beat Ruffian2.00 even if both are using the best machine that they can use.
>
>How much speed improvement can crafty get from parallel search relative to the
>fastest single processor?

At least 3X faster on only 4 processors.  On 16 processors, probably 12X
faster.

That is significant.  And there  are machines that go beyond 16.

>
>I think that for users the main question is how much speed improvement can
>Crafty get in their system from parallel search and the answer for most of them
>is that Ruffian2.00 is simply better because most of the users of more than 1
>processor do not use more than 2 processors.
>
>Uri



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