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Environment variable list shouldn't be longer than 2049 chars

If a program execution aborts with the error message

Environment variable list for the job is .... characters
It shouldn't be longer than 2049 chars - Aborting.

Instead of mpirun -env_all use:
mpirun -exp_env VARNAME1 [ -exp_env VARNAME2 ]
to export the needed environment variables.


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