3.2.3. Notes on running CTSM Environment variables that may need to be set at runtime

With the MPT MPI library (which is the default MPI library on NCAR’s cheyenne machine), it is important to set the environment variable MPI_TYPE_DEPTH to 16 when running CTSM (this setting is required by the Parallel IO library). Typically you should set this variable in your job submission script, using either:

export MPI_TYPE_DEPTH=16


setenv MPI_TYPE_DEPTH 16

prior to running the model.