IntelĀ® MPI Library User's Guide for Linux* OS
Sometimes an unexpected event can occur and the results of many days tuning can be lost. mpitune saves intermediate results into a mpituner_session_<session-id>.mts file and you can restart mpitune from the last saved session:
$ mpitune --session-file ./mpituner_session_<session-id>.mts
Where <session-id> is the Unix* timestamp of the moment tuner started.