Hi Manuel, I think I know where the problem is. I reimplemented part of the memory management with the hope that the performance would be okay (even on Mac OS, where we had issues before with many threads). I'll have to get back to drawing board it seems ;-(
Thanks for letting us know! Christian -- Christian Schulte, www.ict.kth.se/~cschulte/ > -----Original Message----- > From: Manuel Baclet [mailto:manu.bac...@gmail.com] > Sent: Monday, September 03, 2012 5:14 PM > To: cschu...@kth.se > Cc: users@gecode.org > Subject: Re: [gecode-users] Slow down between revision 13005 and 13037 > > The program is a personal production to find a timetable for students. I run it on > a Core i5 laptop with two cores. I have found that a high number of threads > increases the chances of finding a solution (from 20% with one thread to almost > 100% with 80 threads). I can try to find a simple example if you want. > > Cheers, > Manuel > > > Le 3 sept. 2012 à 16:52, "Christian Schulte" <cschu...@kth.se> a écrit : > > > Thanks, but this is the trunk so this is to be expected in between releases. > > > > Which kind of program did you try? And how many CPUs does your machine > > have (I guess less than 80)? > > > > Cheers > > Christian > > > > -- > > Christian Schulte, www.ict.kth.se/~cschulte/ > > > > > > -----Original Message----- > > From: users-boun...@gecode.org [mailto:users-boun...@gecode.org] On > > Behalf Of Manuel Baclet > > Sent: Monday, September 03, 2012 4:42 PM > > To: users@gecode.org > > Subject: [gecode-users] Slow down between revision 13005 and 13037 > > > > Hello, > > i don't know if you already know about this but i have found a huge > > slow down between revision 13005 and revision 13037. > > Testing on the same program with 80 threads on osx 10.8.1 (compiled > > with clang), the mean time for finding a solution: > > > > revision 13005: > > time 15s > > cpu system 10%/400% > > > > revision: 13037 > > time 50s > > cpu system 30%/400% > > > > Hope this can help, regards, > > Manuel Baclet > > > > > > _______________________________________________ > > Gecode users mailing list > > users@gecode.org > > https://www.gecode.org/mailman/listinfo/gecode-users > > _______________________________________________ Gecode users mailing list users@gecode.org https://www.gecode.org/mailman/listinfo/gecode-users
