Author: Dann Corbit
Date: 14:58:42 01/20/06
Go up one level in this thread
On January 20, 2006 at 17:27:10, Uri Blass wrote:
>On January 20, 2006 at 17:07:09, Dann Corbit wrote:
>
>>Consider Deep Shredder or Deep Fritz on a 4 way box with dual core CPUs
>>8x CPU speed would mean 150 Elo (with some SMP loss).
>>
>>That is a system runnable today.
>>
>>Now, imagine an 8 way box with 4 cores each (probably next year)
>>That would be another 100 Elo.
>>
>>If we lost one whole doubling from SMP loss, it would still be +200 Elo.
>>
>>But I think that on a single CPU, Rybka is probably the strongest.
>
>I think that there is a diminishing returns so I am not sure if your estimate is
>correct.
I allowed for a 50% SMP loss for the +200 Elo estimate.
I think that even with 32 cores, that should be achievable.
{16x speedup for 32 cores}
But maybe not.
I did see an experiment where linear speedup was achieved for a large number of
processors.
In order to accomplish it, the tree was simply expanded and processors were
given leaf nodes of the expanded tree to work on.
And so, with 20 CPUs at the root position, you would give each CPU one of the 20
possible first moves to work on. And if you had 400 CPUs, you could expand 2
levels.
It is also what the chessbrain project does, according to my understanding.
Of course, they have a huge network latency to overcome, so it is not like SMP
at all. That is why I did not consider network based solutions for the
strongest possible chess engine.
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