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If you have installed a release in a non-standard locations (rather than at /reg/g/psdm) at your site/computer then the MPI application won't be able to find certain files. That's because the installation path for the library is hard-wired into OpenMPI binaries and libraries at a time when the library is being built. This problem is explained in this OpenMPI FAQ. Asolution A solution to this problem is to find a location where the library is installed within your release and set an environment variable OPAL_PREFIX overriding the base path. Here is how this variable could be installed at SLAC for RHEL5 inf you're using TCSH.

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