IntelĀ® MPI Library Reference Manual for Linux* OS
If you do not specify values for any process pinning environment variables, the following default settings are used. For more details about these settings, see Environment Variables and Interoperability with OpenMP API.
I_MPI_PIN=on
I_MPI_PIN_MODE=pm
I_MPI_PIN_RESPECT_CPUSET=on
I_MPI_PIN_RESPECT_HCA=on
I_MPI_PIN_CELL=unit
I_MPI_PIN_DOMAIN=auto:compact
I_MPI_PIN_ORDER=compact