MPI_PROCBIND

Binds each MPI process to its own processor. By default, MPI_PROCBIND is set to 0, which means processor binding is off. To turn processor binding on, set it to 1. The system administrator may allow or disable processor binding by setting the pbind parameter in the hpc.conf file on or off. If this parameter is set, the MPI_PROCBIND environment variable is disabled. Performance can be enhanced with processor binding, but very poor performance will result if processor binding is used for multithreaded jobs or for more than one job at a time.