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To run 4 MPI ranks on a KNL setup in SNC-4 mode in flat mode you can use the following commands:
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```
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# Allows MPI to be run locally
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unset I_MPI_HYDRA_BOOTSTRAP
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# Places user allocated memory and MPI memory in the correct sub-numa region in MCDRAM
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export I_MPI_HBW_POLICY=hbw_preferred,hbw_preferred
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# Makes sure that each MPI rank is assigned a sub-numa region of its own. So that it only sees 16 cores when it pins threads.
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export I_MPI_PIN_DOMAIN=numa
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# Gives debug information about MPI
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export I_MPI_DEBUG=5
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``` |
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