Interesting... Actually the only difference between bzr3001 and collide2 is in the default parameters of the collider. I modified them because Anton reported a small slowdown. Try setting verletDist=-0.7, minSweepDistFactor=0.05, then you should get the result of the collide branch. I'll try your script.
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 > -- _______________ Bruno Chareyre Associate Professor ENSE³ - Grenoble INP 11, rue des Mathématiques BP 46 38402 St Martin d'Hères, France Tél : +33 4 56 52 86 21 Fax : +33 4 76 82 70 43 ________________ _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
