[Computer-go] Kas Cup - results and prizes

Michael Williams michaelwilliams75 at gmail.com
Fri Aug 10 00:06:18 PDT 2012


Why don't you use a shared tree?


On Thu, Aug 9, 2012 at 11:49 PM, David Fotland <fotland at smart-games.com> wrote:
> 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.
>
>
>
> david
>
>
>
> 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.
>
>
>
> 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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