On Tuesday 27 January 2009, Jeff Squyres wrote: > It is worth clarifying a point in this discussion that I neglected to > mention in my initial post: although Open MPI may not work *by > default* with heterogeneous HCAs/RNICs, it is quite possible/likely > that if you manually configure Open MPI to use the same verbs/hardware > settings across all your HCAs/RNICs (assuming that you use a set of > values that is compatible with all your hardware) that MPI jobs > spanning multiple different kinds of HCAs or RNICs will work fine. > > See this post on the devel list for a few more details: > > http://www.open-mpi.org/community/lists/devel/2009/01/5314.php
So is it correct that each rank will check its HCA-model and then pick up suitable settings for that HCA? If so maybe OpenMPI could fall back to a very conservative settings if more than one HCA model was detected among the ranks. Or would this require communication in a stage where that would be complicated and/or ugly? /Peter
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