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This Web page explains how to run a program on the TerpConnect or Glue
systems while NOT logged on. If you are trying
to run programs while not being logged on, and
it's not working properly, these pages should explain why. If
you do not follow these directions, your job will probably be
killed by the system. Results from the job being killed are unpredictable,
but would result in at least missing or incomplete output
file(s).
If you want to have programs continue to run after you log
off, you will need to alter the priority of the process so it
will be allowed to continue to run after you have logged off.
To run a long (or any) job without being logged on, you need
to use the nice command. The
standard syntax of the nice command
is:
nice -19 COMMAND
For example, if you normally run your program with:
myprog < myinfile > myoutfile &
where myprog reads from "myinfile" and writes to
"myoutfile", you would instead use:
nice -19 myprog < myinfile > myoutfile
&
This would run it in the background (that's what the "&"
does) with a low priority, which the system will allow to
run.
If you are interested in learning more about the specifics of
process priority, how processes NOT associated with
a terminal (tty) are dealt with, and the
nice command, go to the following document Supporting information on running processes in the background on Glue
for more information.
If you have already started a process, and wish to alter it's
priority so it will continue to execute after you log off, go to the following document How to use renice to run a process in the background for more information.
There are some considerations to take into account when you
intend on running a job while not logged in; for details, go to the following document Considerations When Running Processes in the Background on TerpConnect When Not Logged On
for more information.
If you have any questions about this, you can try checking
the online manual pages for nice
and renice with:
man nice
man renice
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