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I am running UPP in parallel, but it fails.

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This may be a memory issue, try increasing the number of CPUs or spreading them out across nodes (e.g. increase ptiles).

We also know of one version of MPI (mpich v3.0.4) that does not not work with UPP. A work-around was found by modifying the UPP/src/unipost/WRFPOST.f routine to change all unit 5 references (which is standard I/O) to unit 4 instead.