Ushnish Basu
Ansys Employee

MPI by definition runs muitiple copies of the specified process, with appropriate communication between them. Whether those processes run on the same machine/node or not depends how the hostfile is specified, e.g. see the questions on hosts here:

Also, doing a google search for "mpp bind to core" should take you to a page how to make sure LS-DYNA jobs don't migrate from core to core during a run