[GE users] ipcs leftovers

lukacm at pdx.edu lukacm at pdx.edu
Wed May 4 20:48:48 BST 2005


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Reuti,


yes it was MPICH job. I finally cleansed it. I realized that only the owner f
the job running cleanpics will erase its own flags and semaphore. Running
cleanpics as root did not removed the f;lags for all jobs that have been
executed and finnished. SO i guess it is solved for now

thanks

martin

Quoting Reuti <reuti at staff.uni-marburg.de>:

> Martin,
>
> the "cleanpics" is from the MPICH installation and it will simply clean all
> the
> ipcs stuff from the user who started "cleanpics" - nothing more. When a user
> has an additonal job on a node - he/she may kill the other job also.
>
> There was the idea to catch such shmget() calls and delete them after the
> job,
> but I didn't found the time to put it in a proven form to put it on the list.
>
> Was this a MPICH job? - Reuti
>
>
> Quoting lukacm at pdx.edu:
>
> > Hello,
> >
> > i am not sure this is related directly to SGE but as i know here is the
> > utility
> > cleanpics , this might be the right place to ask.
> >
> > After finnishing some jobs i did cluster-fork ipcs and saww that most of
> > computing nodes have somehting like this:
> >
> > ------ Shared Memory Segments --------
> > key        shmid      owner      perms      bytes      nattch     status
> > 0x00000000 458752     submitter 600        4194304    0
> > 0x00000000 524290     submitter 600        4194304    0
> > 0x00000000 557059     submitter 600        4194304    0
> > 0x00000000 589828     submitter 600        4194304    0
> >
> > ------ Semaphore Arrays --------
> > key        semid      owner      perms      nsems
> > 0x00000000 3604480    apache    600        1
> > 0x00000000 3637249    apache    600        1
> > 0x00000000 9863170    submitter 600        10
> > 0x00000000 9895939    submitter 600        10
> > 0x00000000 9928708    submitter 600        10
> > 0x00000000 9961477    submitter 600        10
> >
> >
> > now there is much more of those submitter allocated semaphores. I tried to
> > run
> > cleanpics but nothing happens. The only result i saw was by directly
> > applying
> > ipcrm but it takes ages. Is there another way how to easily remove those
> > semaphores and shared memory segs?
> >
> > thank you
> >
> > martin
> >
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