Hi Bruno, i just tried your new implementation of the optimized contact detection in the trunk version. Have a look at the results:
script: examples/WireMatPM/wirecontacttest.py 200000 iterations, 1253 bodies rev 2999: -j1 2min30sec, -j2 1min41sec, -j3 2min15sec rev3001:-j1 2min37sec, -j2 1min53sec, -j3 2min15sec other script: 22785 bodies rev 2999: -j1 1min42sec, -j2 1min20sec, -j3 1min29sec rev3001:-j1 2min38sec, -j2 2min17sec, -j3 2min44sec This looks not good to me. I must say I didn't play with the parameters but I remember when I was testing with your collide2 branch (rev2925) I got much better performance. Any comments? Klaus On Tue, 24 Jan 2012 02:39:38 AM Bruno Chareyre wrote: > Hi all, > > The branch with optimized contact detection has been merged with trunk > in bzr3000. > According to my last tests and roughly speaking, yade is _3 times > faster_ after this commit, but the result will be worst or better > depending on the number of particles, the number of threads, the > constitutive law used, the velocity of bodies, and a few other things. > > If you don't compile yade, you can try the new version by installing or > updating the yade-daily package. > A few timings are reported on the wiki at > https://www.yade-dem.org/wiki/Colliders_performace > I would be glad to get feedback on the actual speedup in other simulations. > I can imagine possible slowdown in extreme cases, although it is > unlikely to happen (if it happens, then tuning the collider's parameters > should fix the problem). > If you feel like experimenting, you can play with the three parameters > of the new collider: verletDist, targetInterv, and minSweepDistFactor. > Reports can be very usefull as they will help to decide what is best > best default combination for these parameters. > > I hope we can release a stable version on this basis soon, when it is > confirmed that the new collider is bug-free. > > Best regards. > > Bruno _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
