Author: Christophe Theron
Date: 10:16:33 05/14/01
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On May 14, 2001 at 09:52:33, Steve Maughan wrote:
>Christophe,
>
>>Chess Tiger 14.0 (AMD K6-2 450, 6Mb hash) avoids Rxb3 instantly (it plays g6).
>>
>>Chess Tiger 14.1 for Palm (PalmIIIx 26MHz, no WS, 48Kb hash) takes 137s to
>>avoid Rxb3, plays Qxh4, then takes 167s to play g6.
>
>Interesting. May I ask what speed differential you're getting on the Palm
>version? I guess it must be about 1/300 of the speed of the AMD K6-2 i.e. about
>800 nps. Am I close?
>
>Regards,
>
>Steve
Yes you are close.
I get approx 500 nps on the Palm (less in the opening, more in the endgame).
On the K6-2 450 I get typically 150000 nps (more or less). So the PalmIIIx
@26MHz (no WS) is indeed 300 times slower...
After the release of Tiger 12 I have rewritten a number of internal structures
and routines in order to use 16 bits words as often as possible because the
68000 is more comfortable with these.
It worked, and I even got a speedup on the PC (I think it is because the L1
cache is less saturated if I use a lot of 16 bits integers instead of 32 bits
ones).
But I still believe I could optimise further by taking into account some other
architectural differences.
Christophe
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