On Mon, Aug 13, 2018 at 03:28:49PM +0200, Loris Bennett wrote: > Hi Jens, > > Jens Dreger <jens.dre...@physik.fu-berlin.de> writes: > > > 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. > > If you just want to reduce the allowed wall-time for a given rack, can't > you just use a maintenance reservation for the appropriate set of nodes?
I could if I knew that I really want to shut it down at a given time, but if everything works it should just keep going. What I want is a solution for "Do not schedule jobs with walltime larger than X on these nodes" untill I release this limit. And I want to be able to apply and release this limit without forcing users to change anything in their scripts. Basically user should never notice any difference. Regards, Jens. -- Jens Dreger Freie Universitaet Berlin dre...@physik.fu-berlin.de Fachbereich Physik - ZEDV Tel: +49 30 83854774 Arnimallee 14 Fax: +49 30 838454774 14195 Berlin
