[Condor-users] Getting Condor to observe slot limits?

[Mark Calleja <M.Calleja@xxxxxxxxxxxxxxx>]

Hi,

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) 
limits:

http://www.cs.wisc.edu/condor/ligo-tickets/12616.html

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 
comments in 
https://lists.cs.wisc.edu/archive/condor-users/2007-November/msg00156.shtml, 
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.

Cheers,
Mark

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Cambridge eScience Centre, University of Cambridge
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