Wait... Now I realize that the timings are weird. Real times are the same, relative times are different. It could be that the counting is wrong. Something system/hardware dependent. We have troubles with openMP at the moment. So forget it. Thanks for the link anyway Anton. B
On 15 September 2016 at 19:42, Anton Gladky <[email protected]> wrote: > Hi Bruno, > > the only more-less relevant commit is the following [1]. Try to comment > that line and check, whether the regression is no more visible. If it > is so, that problem (described in commit log) should be solved by > more elegant way. > > [1] https://github.com/yade/trunk/commit/07940b52ac31597c07d9d98f289131 > 1d7e6d8e0e > > Cheers > > Anton > > > 2016-09-15 19:23 GMT+02:00 Bruno Chareyre <[email protected] > >: > > Hello all, > > > > I just noticed something I don't think I've ever seen before. > > I'm wondering if some recent changes in force containers (I've seen some > by > > Anton IIRC) could explain that. > > Below are the outputs of "yade --performance" and "yade -j6 > --performance" > > (same build). > > With -j1 the force resetter takes 3.55% of the total cpu time, not > > negligible but ok, we can live with that. > > With -j6 the absolute time it takes is multiplied by 3 almost, reaching > 21% > > in terms of rel. time. This is huge and seriously degradate the > performance > > of the parallel run. > > > > Could someone confirm this? > > > > Bruno > > ______________________ > > 1 CORE > > > > number of bodies 47323 > > > > Elapsed 66.9550299644 sec > > Performance 20.9095567688 iter/sec > > Extrapolation on 1e5 iters 1.32847281675 hours > > =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=* > > Name Count Time Rel. time > > ------------------------------------------------------------ > ------------------------------------------- > > ForceResetter 1400 2373474us > > 3.55% > > InsertionSortCollider 39 4636343us > > 6.93% > > InteractionLoop 1400 49261433us > > 73.62% > > NewtonIntegrator 1400 10642155us > > 15.90% > > TOTAL 66913407us 100.00% > > _______________________ > > 6 CORES > > > > number of bodies 47323 > > > > Elapsed 29.4499371052 sec > > Performance 47.5383018646 iter/sec > > Extrapolation on 1e5 iters 0.584324148912 hours > > =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=* > > Name Count Time Rel. time > > ------------------------------------------------------------ > ------------------------------------------- > > ForceResetter 1400 6370788us > > 21.66% > > InsertionSortCollider 39 1957601us > > 6.66% > > InteractionLoop 1400 13912593us > > 47.30% > > NewtonIntegrator 1400 7174500us > > 24.39% > > TOTAL 29415483us 100.00% > > > > -- > > _______________ > > Bruno Chareyre > > Associate Professor > > ENSE³ - Grenoble INP > > Lab. 3SR > > BP 53 > > 38041 Grenoble cedex 9 > > Tél : +33 4 56 52 86 21 > > Fax : +33 4 76 82 70 43 > > ________________ > > > > Email too brief? > > Here's why! http://emailcharter.org > > > > > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~yade-dev > > Post to : [email protected] > > Unsubscribe : https://launchpad.net/~yade-dev > > More help : https://help.launchpad.net/ListHelp > > _______________________________________________ > Mailing list: https://launchpad.net/~yade-dev > Post to : [email protected] > Unsubscribe : https://launchpad.net/~yade-dev > More help : https://help.launchpad.net/ListHelp >
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