On Mar 18, 2010, at 12:41 PM, Kirk, Benjamin (JSC-EG311) wrote: > Besides, at least mpich and derivatives allow configuration with no threads, > full mutlithreading, and some hybrid I don't understand. So presumably there > is enough of a performance impact - im sure some SC sites will continue with > mpis that only partially support threads for some time to come...
More than "some". I believe you have to ask for thread safety when you compile mpich2... and I'm sure others are similar. I've never turned it on because I figured it would be a performance drain without any gain since I'm probably the only person in my whole company that writes threaded MPI code.... and I don't make errors ;-) Derek PS - The not making errors bit is for Cody's benefit... ;-) ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Libmesh-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-devel
