On Mon, 22 Feb 2016 10:38:30 -0800 Rick Stevens <ricks@xxxxxxxxxxxxxx> wrote: > On 02/22/2016 10:19 AM, Ranjan Maitra wrote: > > Hi, > > > > I am running a fully updated F23 box but this question does not have much to do with Fedora itself, hence the designator and the disclaimer. > > > > I am wanting to run a script which will look at all the jobs that are running and renice all of them which have been on for more than five minutes. (Then I can run the script as a cron job as root and be done with automating the process.) > > > > Are there any suggestions as to how to go about this task efficiently? Actually, before I reinvent the wheel, are there any standard options that already exist and which would be more suitable for me than just to do everything from scratch. > > Use the "-o pid,etimes=" options of ps to get the elapsed time of > tasks in seconds. To get a full list, for example, as root: > > ps ax -o pid,uid,etimes= > ... > 21412 0 833 > 21499 0 631433 > 21541 0 773 > 21597 1000 769 > 21604 1000 769 > 21605 1000 769 > 21608 1000 769 > 21610 1000 769 > 21613 1000 769 > 21681 1000 769 > 21686 1000 769 > 21697 1000 769 > 21751 1000 742 > ... > > (run it as root so you can see ALL of the processes) > > As you can see, you get three columns: the first is the PID of the > task, the second is the EUID of the user running it, and the third is > the elapsed time. > > So, pull that data into a shell array, look for stuff that has the > second column equal to the user ID you're interested in and the third > column >= 300 seconds and renice the PID in the first column. Note that > I'd avoid renicing any tasks with UIDs < your lowest normal user ID > (typically 100) to keep from starving system tasks. > > Hope that helps! Yes, this absolutely helps, thanks!! But is there a 2-d array in bash (or do we do array of arrays)? (I am presuming that I need to store this in a 2-d array and then look at columns 2 and 3 and renice the PIDs in column 1.) Also, how does one assign the output of the ps to a 2-d array? Many thanks again and best wishes! Ranjan ____________________________________________________________ FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop! Check it out at http://www.inbox.com/earth -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
