[gridengine users] Issue with hostname specification and parallel environment - jobs do not start

Reuti reuti at staff.uni-marburg.de
Thu Jan 5 08:51:41 UTC 2017


Am 05.01.2017 um 07:54 schrieb Manfred Selz:

> Hi,
> in my SGE 6.2u5 environment, I am seeing a strange issue when submitting jobs to a parallel environment while also providing a hard hostname resource requirement.
> This is not a standard situation, but sometimes certain benchmarks need to be run on one specific host only.
> When submitting a jobs either with a parallel environment or with a hard hostname resource specification, the jobs starts without delay.
> However, the combination of both sometimes keeps jobs waiting for an extended period of time, and I have not been able to get a clear messages from the “qstat -j  <jobID>” report.
> Parallel environment settings is:
> $  qconf -sp local
> pe_name            local
> slots              1000
> user_lists         NONE
> xuser_lists        NONE
> start_proc_args    /bin/true
> stop_proc_args     /bin/true
> allocation_rule    $pe_slots
> control_slaves     FALSE
> job_is_first_task  TRUE
> urgency_slots      min
> accounting_summary TRUE
> The specific host being targeted has 32 slots configured for the queue being used, and all of them are unused at this time.
> Is anybody aware of specific issues with the combination of parallel environments and a hard hostname resource request?
> I have already tested this:
> ·         Removed the parallel environment request - works
> ·         Removed the hostname request - works
> ·         Removed all resource limits (“qconf -mrqs”) - no change
> ·         Increased the “slots” limit in the PE setting - no change
> ·         Changed the PE allocation_rule to “round_robin” - no change 

I only saw problems when requesting a queue and a host at the same time, i.e. "-q" & "-l h=" at the same time. The solution may work also in your case: request the host by a queue request:

-q "*@node123"

> After all, the final message in the “qstat -j <jobID>” report is always:
> cannot run in PE "local" because it only offers 0 slots

I assume the node is free and you have no backfilling issue where slots are reserved.

-- Reuti

> I have seen many older reports for the “only offers 0 slots” message on older pages, but none specifically for the combination with a hostname spec. (only).
> Regards,
> Manfred
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