Re: [Bug-gnubg] Cache question

[Jonathan Kinsey]

As the cache gets larger it riches a natural plateau, in my initial tests this
was at the current gui limit (4gb entries), I was looking at Ingo's results just
yesterday and there was little (or no) improvement above 2^15 entries. The
settings and position types will be a factor.

It's quite easy to try out, just use the "set cache" command, you need to enter
the number of entries in powers of 2 though, so the current maximum (2^22) would be:
set cache 4194304
just times this by 2 to increase the cache (obviously this doubles the memory
usage as well).

I'd be interested in your results as it might be worth changing the
minimum/maximum and default settings displayed in the gui.

Jon

Michael Depreli wrote:
>>From my tests the extra speed from using max cache although not huge
> was worthwhile.
> Given like you say>2gb is the norm (I have 4gb) would it be worth
> having an even larger cache available in gnubg?
>
>
> ------------------------------------------------------------------------
> From: address@hidden
> To: address@hidden
> CC: address@hidden
> Subject: Re: [Bug-gnubg] Cache question
> Date: Thu, 3 Sep 2009 09:37:15 +0000
>
> The only reason is if the memory usage has any impact for you (running
> several
> copies at the same time for example), it's getting a lot less likely
> that this
> is the case with>2gb becoming the norm on new pcs.
>
> You might find that there is little difference in speed between the
> maximum and
> one-down setting (and this would save you 80mb of memory).
>
> Jon
>
> Michael Depreli wrote:
>> I ran some brief tests using rollouts with different cache settings and
>> larger cache produced faster results (not linear).
>> Are there any known issues (bugs) running gnubg with cache set to max
>> for evals and rollouts for plies up to 2?
>> If not are there any reasons to not set cache to max?
>>
>> Michael
>>
>>
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