[gridengine users] limit slots to core count no longer works

Feng Zhang prod.feng at gmail.com
Tue Apr 14 20:34:47 UTC 2015


What is "$num_proc"? Did you try to set a real number? Like " limit
    hosts {*} to slots=12"?

On Tue, Apr 14, 2015 at 3:32 PM, John Young <j.e.young at larc.nasa.gov> wrote:
> Hello,
>
>    We (fairly) recently upgraded our cluster to Rocks 6.1.1
> and we now seem to be having problems with RQS.  On our old
> cluster, we had an RQS quota set as follows:
>
> {
>    name         host-slots
>    description  restrict slots to core count
>    enabled      TRUE
>    limit        hosts {*} to slots=$num_proc
> }
>
> The reason for this was to try to prevent oversubscription
> of the processors on the clients.  Now, if I have this quota
> enabled, jobs that are submitted don't start and if I do a
> 'qstat -j job-number' under "scheduling info" I see things like
>
> cannot run because it exceeds limit "////compute-0-7/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-0-7/" in rule "host-slots/1"
> (-l slots=1) cannot run in queue "compute-0-39.local" because it offers only hc:slots=0.000000
> cannot run because it exceeds limit "////compute-0-78/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-0-78/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-0-55/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-0-55/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-0-74/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-0-74/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-2-7/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-2-1/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-2-2/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-0-22/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-0-22/" in rule "host-slots/1"
> cannot run because it exceeds limit "////compute-1-2/" in rule "host-slots/1"
> cannot run in PE "mpich" because it only offers 0 slots
>
> But as soon as I run 'qconf -mrqs' and change TRUE to FALSE, the job runs.
>
> Has the process for preventing oversubscription changed?  Any ideas?
>
> JY
>
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-- 
Best,

Feng



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