[Computer-go] Kas Cup - results and prizes

David Fotland fotland at smart-games.com
Thu Aug 9 23:49:34 PDT 2012

On an i7-2600 Many Faces does 11.4K pps with 4 threads, and 18.7k with 8
threads, a 64% increase, so the 2600 scales a little better than the 3770,
but the 3770 is still a litte bit faster.




From: computer-go-bounces at dvandva.org
[mailto:computer-go-bounces at dvandva.org] On Behalf Of Erik van der Werf
Sent: Thursday, August 09, 2012 4:41 AM
To: computer-go at dvandva.org
Subject: Re: [Computer-go] Kas Cup - results and prizes


I don't have an i7-2600, but I could run oakfoam on the 3930. I just
downloaded it and it does compile. If you give me a list of gtp commands to
run the benchmark, then I will send you the output back.




On Thu, Aug 9, 2012 at 12:38 PM, ds <ds2 at physik.de> wrote:

This is very interesting,

I have not more than 10% with oakfoam on i7-2600K. Would be interesting
if it is the processor or if you e.g. access more often memory instead
of cache due to your code...

Do you have the chance to run your program on a i7-2600? or do you have
to much time and try https://bitbucket.org/francoisvn/oakfoam/wiki/Home
on your i7-3930. If so, I would be very much interested in the number
you get in the beginning of a 19x19 game without book:)


Am Donnerstag, den 09.08.2012, 12:16 +0200 schrieb Erik van der Werf:

> On Thu, Aug 9, 2012 at 11:14 AM, Petr Baudis <pasky at ucw.cz> wrote:
>         On Wed, Aug 08, 2012 at 09:08:47PM +0200, ds wrote:
>         > Hyperthreading does the trick, I have the experience it
>         increases the
>         > performance by about 10%. I think this is due to waiting for
>         RAM I/O or
>         > things like that....
>         Yes. With hyperthreading, performance per thread goes down
>         significantly, but total performance goes up by about 15%. In
>         the
>         Pentium 4 era, hyperthreading did not usually pay off, but
>         with i7,
>         its performance is much better. The basic idea is that there
>         are two
>         instruction pipelines that share the same ALU and other
>         processor units;
>         if one of the pipelines stalls (usually due to memory fetch),
>         the other
>         can use the ALU in the meantime, or the two threads may use
>         different
>         parts of the CPU altogether based on what the instructions do.
> 10-15%, really, that low? For my program (on an i7-3930K, going from 6
> to 12 threads) it is more in the order of 40% extra simulations per
> second.
> Erik

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