Why don't you use a shared tree?
On Thu, Aug 9, 2012 at 11:49 PM, David Fotland <[email protected]> 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: [email protected] > [mailto:[email protected]] On Behalf Of Erik van der Werf > Sent: Thursday, August 09, 2012 4:41 AM > > > To: [email protected] > 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 <[email protected]> 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 <[email protected]> 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 >> >> > >> _______________________________________________ >> Computer-go mailing list >> [email protected] >> http://dvandva.org/cgi-bin/mailman/listinfo/computer-go > > > _______________________________________________ > Computer-go mailing list > [email protected] > http://dvandva.org/cgi-bin/mailman/listinfo/computer-go > > > > > _______________________________________________ > Computer-go mailing list > [email protected] > http://dvandva.org/cgi-bin/mailman/listinfo/computer-go _______________________________________________ Computer-go mailing list [email protected] http://dvandva.org/cgi-bin/mailman/listinfo/computer-go
