Re: [Condor-users] enforcing job memory limits?

["Alan Cass" <alan.ocais@xxxxxxxxx>]

Hi,

I was wondering how you'd enforce this on an SMP machine. I've lied to condor about the memory to give me three slots, 2 using single CPUs and half RAM and one that's entitled to use all RAM and both CPUs.

Thanks,
Alan

On 17/11/2007, Todd Tannenbaum <tannenba@xxxxxxxxxxx> wrote:

Todd Tannenbaum wrote:
> Jonathan D. Proulx wrote:
>> Hi,
>>
>> it appears as though a condor job in my flock ehausted the memory on a
>> user workstation over night ($CondorVersion: 6.8.2 Oct 12 2006 $
>> $CondorPlatform: X86_64-LINUX_RHEL3 $).  This triggered Linux's OOM
>> killer which killed several desktop apps and sshd on the system.
>>
>> this seems a prety serious violation of the do no harm principle and
>> I'm a bit surprized.
>>
>> is the a config setting I need to tweak on the workstations?
>>
>
> You could add a clause to your preempt _expression_, i.e. something like
>
>    PREEMPT = ( whatever was there before ) || (ImageSize > (Memory-20))
>
> This should work at least in the v6.9 series (and maybe in v6.8 as well?
> cannot recall offhand), since the condor_startd's value for "ImageSize"
> will be updated several times a minute to the total memory usage of the
> job.

Ouch, in my example above, I didn't deal with the fact that Memory is in
megs and ImageSize is in Kbytes.  So something like the following is
what I meant:

PREEMPT = (whatever was there before) || \
           (ImageSize > ((Memory*0.8)*1024) )

regards,
Todd

--
Todd Tannenbaum                       University of Wisconsin-Madison
Condor Project Research               Department of Computer Sciences
tannenba@xxxxxxxxxxx                  1210 W. Dayton St. Rm #4257
Phone: (608) 263-7132                 Madison, WI 53706-1685
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