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Re: [Condor-users] Getting Condor to observe slot limits?
- Date: Tue, 04 Mar 2008 17:23:05 +0000
- From: Mark Calleja <M.Calleja@xxxxxxxxxxxxxxx>
- Subject: Re: [Condor-users] Getting Condor to observe slot limits?
Thanks Dan. I've baulked from using USER_JOB_WRAPPER since it could
potentially split embedded whitespace in an argument, but PREEMPT now
seems to tick the boxes. More reason for us to upgrade from 6.8 to 7.0 then.
Cambridge eScience Centre, University of Cambridge
Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA
Tel. (+44/0) 1223 765317, Fax (+44/0) 1223 765900
Dan Bradley wrote:
Condor does not (yet) support setrlimit. You can still do this inside
of USER_JOB_WRAPPER if you wish.
PREEMPT _can_ discriminate between a heterogeneous set of slot
definitions. For example the machine attributes Memory, VirtualMemory,
and Disk in this expression refer to the attribute of the particular
slot that is running the job, whereas TotalMemory, TotalVirtualMemory,
and TotalDisk refer to properties of the whole machine. Prior to 6.9.5,
DiskUsage was not updated in the copy of the job ClassAd that was used
to evaluate PREEMPT. Now, for vanilla universe jobs, DiskUsage is
updated, so you can PREEMPT based on disk usage as well as virtual
Mark Calleja wrote:
I recently came across a very interesting condor-admin thread from a few
years ago that raised the issue of having Condor enforce slot (then VM)
Towards the end of that exchange, one of the Condor developers, in
response to a user's comment that it would be useful for Condor to
police these limits using setrlimit, writes:
"Agreed--I'm just trying hard to find a short-term solution that can
hold you over while we improve things."
With no intention of putting anyone on the spot, can I ask whether this
ever led to anything concrete? Speaking personally, I'd be very keen to
see such a solution implemented since in our flocked environment the
execute nodes cannot depend on cooperation from the submit hosts (e.g.
using periodic removes) to perform the policing. I realise that one can
go some way at achieving this using PREEMPT expressions, e.g. Todd's
but that doesn't seem to be able to discriminate between a heterogeneous
set of slot definitions on a multi-processor machine, e.g. we allow some
slots more resources than others. Also, it would be nice to be able to
enforce all of the resources in a slot definition, e.g. disk usage.
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