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Subject: Re: g++ 3.4 and -fprofile-generate

Author: Robert Hyatt

Date: 18:13:01 02/17/05

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On February 17, 2005 at 19:27:51, Dieter Buerssner wrote:

>On February 17, 2005 at 16:27:06, Robert Hyatt wrote:
>
>>For example, none of the EGTB code will be profiled
>>if you don't use a couple of endgames.
>
>It won't matter. 90% in EGTB accessing will be used for fread(). There is not
>much potential (one could say practically no potential) for PGO for EGTB access.
>At least not in positions I tried and rather carefully profiled (this included
>positions, where over 90% of the ovarall time was used for TB probing). Perhaps
>with really fast disks, the situation is slightly different, but still, the
>potential for PGO will be very small here.
>
>Regards,
>Dieter


I've got "really fast disks" here.  U320 15K scsi drives.  But I don't have all
endgame tables on my machine, which means I call EGTBProbe() many times and it
goes through its internal checks and returns failure.  Those can be optimized...
 Plus all the special-case endgame evaluation that would never be touched from
an opening position, but which would be important in an endgame position later
in the game...



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