[GE users] Moved to users list: Re: [GE issues] Calendar and advance reservation

fredwag Frederik.Wagner at lrz.de
Fri May 7 09:24:53 BST 2010


On 05/06/2010 07:39 PM, reuti wrote:
> Am 06.05.2010 um 14:24 schrieb fredwag:
> 
>> On 05/06/2010 12:14 PM, Reuti wrote:
>>> Hi,
>>>
>>> (the issues list is mainly for the emails which are send automatically when changes to the issues database are made)
>>>
>>> Am 06.05.2010 um 09:06 schrieb fredwag:
>>>
>>>> Hi .*,
>>>>
>>>> I have a problem in SGE 6.2u1:
>>>>
>>>> We have setup for visulization system with multiple nodes and multiple
>>>> graphics cards per node. Through SGE a users can reserve a graphics card
>>>> to do their visualization job, for this an advance reservation system is
>>>> configured (its a batch queue, but interactive work).
>>>>
>>>> Now there is the demand for a nightly batch queue (no ar) for normal
>>>> dataprocessing jobs (since the machines have lots of memory and they
>>>> idle during the night). So I configured a 'nightly' batch queue, with a
>>>> calendar attached to it (4-20=off 20-4=on).
>>>>
>>>> My problem now is the following:
>>>> As soon there exists an advance reservation (for an already running job
>>>> or for the future) _no_ jobs are running in nightly queue. The scheduler
>>>> info gives (when the queue is by calendar enabled):
>>>> '(-l NONE) cannot run in queue "nightly at somehost..." because it offers
>>>> only qc:slots=0.000000 due to a reservation'
> 
> And the AR will end before the nighly queue is active? Maybe the slots are enabled by the calendar then, but allocated to the AR.

some more details:

There are two hosts managed by this SGE instance: Both are member of two
queues:
1. each has its 'graphic card reservation queue', i.e. host1_graphics
and host2_graphics handled by the AR mechanism, the only interesting
resource here is the graphics card.
2. the 'nighlty' queue is available on both hosts with 1 slot each, here
the calendar is attached (week 4-20=off 20-4=on).

So there should be no interference in terms of 'slots' between the two
queues on each host.
ARs are alway possible, so I could make a reservation for tomorrow in
the graphics queue, but clearly would still like to have jobs running in
the nigthly window.

And that's exactly where the problem lies: if there is a reservation for
tomorrow, the nigthly jobs wont run, with the error:
'(-l NONE) cannot run in queue "nightly at somehost..." because it offers
only qc:slots=0.000000 due to a reservation'

If there are no ARs evertythings works fine. Also in the case, when I
detach the calendar (so the queue is always available).

What more information do you need?

Thanks a lot for the help,
Frederik

>
> 
> Can you give more details about the setup?
> 
> -- Reuti
> 
> 
>>>>
>>>> What could be the problem here?
>>>>
>>>> The jobs in nightly _are_ running, when
>>>> * I take away the calendar, so the job is always enabled
>>>> * no advance reservation exists
>>>>
>>>> I already played with the scheduler parameters Maximum
>>>> Reservation/Default Duration etc...
>>>>
>>>> It seems that the complex slots is somehow influenced by pending
>>>> reservations... but why? Is this a 'backfilling' problem? I don't know
>>>> where to search anymore. Or is this a bug?
>>>
>>> there one issue which I also observed with RQS:
>>>
>>> http://gridengine.sunsource.net/issues/show_bug.cgi?id=2761
>>>
>>> Are you using RQS?
>>
>> no, we are not using RQS, just an advance reservation queue and a normal
>> queue with calender.
>>
>> Thanks and bye,
>> Frederik
>>
>>>
>>> -- Reuti
>>>
>>>
>>>
>>>> Thanks a lot for any help!
>>>> Bye,
>>>> Frederik
>>>>
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>>>
>>
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-- 
Frederik Wagner
Compute Server
Leibniz-Rechenzentrum       Tel.  : +49 (0)89 35831-8872
Boltzmannstr. 1             Fax   : +49 (0)89 35831-8672
D-85748 Garching            Email : Frederik.Wagner at lrz.de

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