Gamma / MPI
Sorry for the beginner question:
I have seen multiple posts about how using Gamma MPI is beneficial to improving parallel efficiency. 1. How do I see what MPI (gamma, openmpi, etc...) I am using? 2. How do I change it to something else (gamma for example) in OpenFOAM 1.6? From what I read, it is something like: a. Edit ~OpenFOAM/OpenFOAM-1.6/etc/bashrc to be "gamma" instead of openmpi in the "WM_MPLIB" b. cd $FOAM_SRC/Pstream c. ./Allwmake Now when I try to decomposePar it says: decomposePar: error while loading shared libraries: libPstream.so: cannot open shared object file: No such file or directory Can somebody please point me to how to install gamma mpi and also set it up with OpenFOAM 1.6? Thanks, Jason |
From what I know:
1. It only makes really sence on ethernet clusters no ib or similar 2. last recommendation was to use open-mx instead of gamma since it is much easier to compile. TO use it build open-mx (http://open-mx.gforge.inria.fr/) from source and afterwards compile openmpi against open-mx. Regards |
Does Gamma effect parallel scalability on a single node (i.e. from 2 to 3 to 4 cores on a single processor)?
I am still in the single-box testing phase before I get to ethernet or ib. Thanks, Jason |
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