> What is the parallel structure used in YADE? I remember in one mail > (from email-list), it is said that YADE does not use the domain > decomposition method, then what is the parallel method?
Yade parallelizes loops over bodies and interactions using openMP; see notably http://bazaar.launchpad.net/%7Eyade-dev/yade/trunk/annotate/head% 3A/pkg/common/Engine/MetaEngine/InteractionDispatchers.cpp#L40 http://bazaar.launchpad.net/%7Eyade-dev/yade/trunk/annotate/head% 3A/pkg/dem/Engine/StandAloneEngine/NewtonsDampedLaw.cpp#L57 Speedup depends very much on the computer architecture, RAM speed, cache size etc (openmp is shared-memory parallelization). I have speedup over 3x on 4 cores (i7 with ddr3 ram) and recently I had 5.78 on a 2x4core Xeon X5570. I don't know of anyone running on something larger than 8 cores; it might scale further, especially for large simulation, where the openMP overhead and the non-parallel portions of computation (collider, for instance) don't play large role. (If you have 2 engines that don't touch the same data and are independent, there is ParallelEngine for that, but I don't know of any case where it really pays off; maybe the coupling problems could benefit from that) Cheers, Vaclav _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
