On Mon, 22 Feb 2016 10:58:53 -0800 Rick Stevens <ricks@xxxxxxxxxxxxxx> wrote: > On 02/22/2016 10:50 AM, Ranjan Maitra wrote: > > 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? > > Uhm, no. You can simulate them using associative arrays, but it gets > rather hairy. You may want to try something like awk or PHP or Perl to > do this more easily. OK, thanks! I guess i will have to figure out one of awk, etc then. Separately, I have realized that I should also output nice as part of the ps options because there is no point in renicing jobs that are already niced. 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
