To cope with multinode jobs if you need to restart pbs_mom.
Admin can send SIGQUIT to pbs_mom and the pbs_mom distinguishes two states:
- no multinode job present - pbs_mom quits immediately
- multinode job is present - pbs_mom waits until no multinode job is present then quits
Admin can start the pbs_mom with the -p parameter again with no loss of jobs.