Caution Regarding the Use of -i Option

Use the -i option to mprun with caution, since the -i option provides only one stdin connection (to rank 0). If that connection is closed, keyboard signals are no longer forwarded to those remote processes. To signal the job, you must go to another window and issue the mpkill command. For example, if you issue the command mprun -np 2 -i cat and then type the Ctrl-d character (which causes cat to close its stdin and exit), rank 0 will exit. However, rank 1 is still running, and can no longer be signaled from the keyboard.