[Computer-go] Kaś Cup - results and prizes

Erik van der Werf erikvanderwerf at gmail.com
Thu Aug 9 04:40:57 PDT 2012


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.

Erik


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:)
>
>
> Detlef
>
> 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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>
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