[Mauiusers] confused about standing reservations
sjones at hep.ph.liv.ac.uk
Thu Feb 4 03:21:08 MST 2010
We use SRs to set-aside test nodes. The QOS etc makes the relationship
fixed at both ends,
i.e. that-node can only be used by that-user, and that-user can only use
I'd say this about it. Maui seems to read the definitions once, at boot
definitions in the maui.cfg file can conflict/interfere (so you have to
check the whole file) and
subsequent command line reservations (via setres) can also
I'm not sure of the "order of priority", so to speak.
I'm certain that the assignment of jobs to nodes is done dynamically,
not at job submission time.
The latter strategy would have bad consequences wrt maximizing the usage
of nodes that become
free at (more or less) random times, i.e. at submission time, it is not
possible to predict what the state
of the cluster will eventually be when the queued job is selected to be
Steve Johnson wrote:
> I've used SR's with decent success for blocking out access during lab times.
> SRCFG[bloc122mw] GROUPLIST=root
> SRCFG[bloc122mw] STARTTIME=07:30:00
> SRCFG[bloc122mw] ENDTIME=17:00:00
> SRCFG[bloc122mw] DAYS=MON,WED
> SRCFG[bloc122mw] HOSTLIST=bloc122-[00-32]
> I also do pbsnodes -o via cron to mark the nodes offline so that Globus MDS
> reports the correct number of available nodes. It also provides a second
> layer of protection against a job starting when it's not suppose to.
> It's a different story when using SR's in place of partitions. I just
> couldn't get it to behave as desired in terms of keeping jobs from particular
> classes separated, so I went back to partitions.
> // Steve
> Tom Rudwick wrote:
>> I recommend not using standing reservations. We found them to be buggy and
>> unreliable. I recommend using cron jobs to create regular reservations.
>> skip at pobox.com wrote:
>>> I'm trying to use standing reservations (Maui 3.2.6p21) to avoid running
>>> jobs on certain nodes during work hours. For example:
>>> SRSTARTTIME[userver171] 07:00:00
>>> SRENDTIME[userver171] 16:00:00
>>> SRPERIOD[userver171] DAY
>>> SRDAYS[userver171] MON TUE WED THU FRI
>>> SRHOSTLIST[userver171] userver171
>>> SROWNER[userver171] USER:kim
>>> SRMAXTIME[userver171] 5:00:00
>>> I interpreted the above to mean that on weekdays jobs can only be run on
>>> userver171 by Kim between 07:00 and 16:00.
>>> This doesn't seem to work. Jobs continue to be placed on that machine
>>> during the reserved period.
>>> Is the assignment of jobs to nodes done dynamically or at the time of job
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