[slurm-users] Transparently assign different walltime limit to a group of nodes ?

[Jens Dreger]

Hi everyone!

Is it possible to transparently assign different walltime limits
to nodes without forcing users to specify partitions when submitting
jobs?

Example: let's say I have 10 nodes. Nodes n01-n05 should be available
for jobs with a walltime up to 14 days, while n06-n10 should only
be used for jobs with a walltime limit less then 1 day. Then as long
as nodes n06-n10 have free resources, jobs with walltime <1day should
be scheduled to these nodes. If n06-n10 are full, jobs with walltime
<1day should start on n01-n05. Users should not have to specify
partitions.

Would this even be possible to do with just one partition much
like nodes with different memory size using weights to fill nodes
with less memoery first?

Background of this question is that it would be helpfull to be able
to lower the walltime for a rack of nodes, e.g. when adding this rack
to an existing cluster in order to be able to easily shut down just
this rack after one day in case of instabilities. Much like adding
N nodes to a cluster without changing anything else and have only
jobs with walltime <1day on thiese nodes in the beginning.

Thanks,

Jens.
-- 
Jens Dreger                      Freie Universitaet Berlin
dreger at physik.fu-berlin.de       Fachbereich Physik - ZEDV
Tel: +49 30 83854774             Arnimallee 14
Fax: +49 30 838454774	         14195 Berlin