[Mauiusers] Large queues cause Maui to idle

Steve Young chemadm at hamilton.edu
Wed Dec 10 15:45:03 MST 2008


Actually I think thanks should go to Garrick ... he's the one who got  
me steered onto the right direction =).

-Steve

On Dec 10, 2008, at 5:36 PM, Nicholas Geraedts wrote:

> Thank you Steve! Your solution is exactly what we're looking for and  
> seems to work quite well.
>
> Cheers,
> -Nick
>
>
> On Wed, Dec 10, 2008 at 12:57 PM, Steve Young <chemadm at hamilton.edu>  
> wrote:
> I've used a routing queue to solve this problem. The queue that the  
> user is running on can only utilize 32 cpu's. The thousands of jobs  
> are 1 cpu each. So I have this for a routing queue:
>
> create queue physics
> set queue physics queue_type = Route
> set queue physics acl_group_enable = True
> set queue physics route_destinations += herc
> set queue physics enabled = True
> set queue physics started = True
>
> So jobs that go into here are moved to the herc execution queue.  
> This queue has the following setting:
>
> set queue herc max_queuable = 36
>
> This way only 36 jobs at time can be queue'd from the routing queue.  
> This way maui doesn't even have to worry about considering each of  
> all the thousand's of jobs each iteration. It only has to worry  
> about scheduling the jobs for the resources it has to run on.
>
> I also use MAXIJOB in maui:
>
> CLASSCFG[herc]          QLIST=md QDEF=md MAXIJOB=4
>
> This way even if a user had lots of jobs in the queue only their top  
> 4 idle jobs will get considered for scheduling. This way others will  
> be able to get their jobs to run without having to wait for maui to  
> process thousands of jobs that can't run yet anyhow.
>
> I hope this helps.
>
> -Steve
>
>
>
>
>
> On Dec 10, 2008, at 3:38 PM, Nicholas Geraedts wrote:
>
> Thanks Troy and Halvor. You were both correct about the MMAX_JOB  
> definition in the .h file. I've increased it and asked the user to  
> try to break the system again. I'll let you know how things go.
>
> Cheers,
> -Nick
>
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>

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