[GE users] Can high priority jobs suspend low priority jobs and use their resources?

seandavi seandavi at gmail.com
Thu Apr 29 18:38:26 BST 2010


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On Thu, Apr 29, 2010 at 9:29 AM, futurity <neil at futurity.co.uk> wrote:
> Hi,
>
> I'm wondering if high priority jobs can suspend low priority jobs and use
> their suspended resources?  My tests indicate that this isn't possible.

You might look at using a subordinate queue setup:

http://wikis.sun.com/display/GridEngine/Configuring+Queues#ConfiguringQueues-HowtoConfigureSubordinateQueues

Sean

> Is the grid engine scheduler smart enough to know that a high priority job
> will suspend a low priority job before it it run on the same machine and
> therefore calculates the resources that will be available once the low
> priority job is suspended?
>
> If so, is there a way to configuring the grid engine so that high priority
> jobs are transferred to machines not only when the resources are free, but
> when there will only be sufficient resources once the subordinate job is
> suspended?
>
> For example, if I have a machine with a consumable "virtual_free" memory of
> 3000MB.  If a low priority job runs on this machine requesting 1000MB, this
> reduces the virtual_free to 2000MB.
>
> Can a high priority job (one that that would suspend the low priority job)
> be able to be run on this same machine if it required 2500MB virtual_free
> memory?  There isn't 2500MB available, only 2000MB so I assume it would be
> prevented from running on this machine?
>
> In reality, surely if this high job was run on this machine, 500MB of the
> low priority job's 1000MB memory would be swapped out to disk and the high
> priority job run in the 2500MB it requires.  Then when the high job is
> finished, the low priority job would be swapped back to real memory and
> continued to run.
>
> As you can see, its frustrating that high priority jobs are prevented from
> running on a machine because a resource isn't already available, although it
> will be available once the low priority job already running there is
> suspended.
>
> Kind Regards
>
> Neil
>
>
>
>
>
>

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