pegasus-halt — stops a workflow gracefully, current jobs will finish
pegasus-halt stops a workflow gracefully by allowing the jobs already running to finish on their own. No new jobs will be submitted. Once all jobs have finished, the workflow will stop. A stopped workflow can be restarted with the pegasus-run command.
Another way to remove a workflow is with the pegasus-remove command. The difference is that pegasus-remove will stop running jobs.
Pegasus Team http://pegasus.isi.edu