I believe the hash is shared and configured by total size. On Thu, Dec 7, 2017 at 5:29 PM Jeff Caldwell <jeffrey.d.caldwell@gmail.com> wrote:
Thanks, good to know.
Is there any reason to think the 1GB hash would or would not be per thread, even without a network/
On Thu, Dec 7, 2017 at 8:25 PM, Tomas Rokicki <rokicki@gmail.com> wrote:
I would expect them to be using a two socket, 16 physical core per socket, two thread per physical core box as this is a pretty standard server configuration. No network involved.
On Thu, Dec 7, 2017 at 5:22 PM Jeff Caldwell < jeffrey.d.caldwell@gmail.com> wrote:
Unless they used a 64-core processor, they were using network-connected machines, so it may be at least 1GB per machine. However, a Stockfish support page lists the optimal hash size as (transaction-per-second x seconds per move)/100 MB. The Deep Mind paper shows Stockfish running 70,000 transactions per second and each player given one minute per move. That results in a recommendation of a 42GB hash, or 656MB per thread. Running a separate hash per thread at 1GB per hash gives a total hash size of 64GB. Does anyone here know about configuring or tuning Stockfish in this manner? My quick searches yielded no additional information.
On Wed, Dec 6, 2017 at 6:41 PM, Tomas Rokicki <rokicki@gmail.com> wrote:
Page 5 of the paper. I would expect for 64 threads you'd use a bit more hash memory.
https://cdn.chess24.com/GzFl-Z4-SVWO-mC9rL6XhQ/original/mastering-chess-and-...
On Wed, Dec 6, 2017 at 3:37 PM, Thane Plambeck <tplambeck@gmail.com>
wrote:
where did you read that, tom? just curious On Wed, Dec 6, 2017 at 11:58 AM Tomas Rokicki <rokicki@gmail.com>
wrote:
Seems they limited stock fish to 1GB hash. That seems low. Wonder
why
they
did this.
On Wed, Dec 6, 2017 at 11:42 AM Hans Havermann <gladhobo@bell.net> wrote:
> https://chess24.com/en/read/news/deepmind-s-alphazero-crushes-chess > > "Stockfish is the reigning TCEC computer chess champion, and while it > failed to make the final this year it went unbeaten in 51 games. In a match > with the chess-trained AlphaZero, though, it lost 28 games and won none, > with the remaining 72 drawn. With White AlphaZero scored a phenomenal 25 > wins and 25 draws, while with Black it 'merely' scored 3 wins and 47 draws. > It turns out the starting move is really important after all!" > _______________________________________________ > math-fun mailing list > math-fun@mailman.xmission.com > https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun > -- -- http://cube20.org/ -- http://golly.sf.net/ -- _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
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