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Subject: Re: perft records

Author: Reinhard Scharnagl

Date: 07:33:39 09/07/04

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Hi Sune,

>You used 512 MB hash?
>Gosh, I only have 512 total in the machine.

well, that saves some time during testing. But as we could see from our results,
the mor RAM is not always helpful at low plys.

>Well default is 50 MB hash as is also used in the latest public version.

> ply -- seconds

>> FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

> (50 MB)        (200 MB)
> 05 -- 0.16     05 -- 0.19
> 06 -- 1.98     06 -- 2.08
> 07 -- 27.70    07 -- 24.86
> 08 -- 531.19   08 -- 389.23

>> FEN: r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 25

> 50 MB:         200 MB:
> 04 -- 0.16     04 -- 0.19
> 05 -- 3.64     05 -- 3.80
> 06 -- 115.12   06 -- 108.92

Ok, here are some better matching values:

FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

Ply          Nodes         all (x)         all (+)   Seconds
------------------------------------------------------------
01              20               0               0         0
02             400               0               0         0
03            8902              34              12         0
04          197281            1576             469         0
05         4865609           82719           27351       0.1
06       119060324         2812008          809099       1.5
07      3195901860       108329926        33103848      20.5
08     84998978956      3523740106       968981593     381.2
------------------------------------------------------------

FEN: r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 25

Ply          Nodes         all (x)         all (+)   Seconds
------------------------------------------------------------
01              48               8               0         0
02            2039             351               3         0
03           97862           17102             993         0
04         4085603          757163           25523       0.2
05       193690690        35043416         3309887       3.7
06      8031647685      1558445089        92238050     107.4
------------------------------------------------------------

and:

FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

Ply          Nodes         all (x)         all (+)   Seconds
------------------------------------------------------------
01              20               0               0         0
02             400               0               0         0
03            8902              34              12         0
04          197281            1576             469         0
05         4865609           82719           27351       0.1
06       119060324         2812008          809099       1.6
07      3195901860       108329926        33103848      20.1
08     84998978956      3523740106       968981593     301.5
------------------------------------------------------------

FEN: r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 25

Ply          Nodes         all (x)         all (+)   Seconds
------------------------------------------------------------
01              48               8               0         0
02            2039             351               3         0
03           97862           17102             993         0
04         4085603          757163           25523       0.2
05       193690690        35043416         3309887       3.8
06      8031647685      1558445089        92238050      97.6
------------------------------------------------------------

>>because it would be very interesting for me to know the ply-timings,
>>for to estimate and to compare the groth of dure from ply to ply,
>>when using a transposition table.

>The replacement scheme is not unimportant here either, the hash will saturate
>badly when going deep.

You obviously understand! The perft test here is not primarily targeting at
records, but for to help to visualize the caching behaviour.

>And of course the machines are not identical.

Nevertheless your figures are very impressive!

Regards, Reinhard.



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