[gecode-users] Slow down between revision 13005 and 13037

[Manuel Baclet]

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" <cschulte at 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-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf
> Of Manuel Baclet
> Sent: Monday, September 03, 2012 4:42 PM
> To: users at 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
> 
> 
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