[Mauiusers] Help with Maui

Steve Young chemadm at hamilton.edu
Thu Jun 26 08:06:37 MDT 2008

Thanks Ronny. Good point. On the other hand pre-emption still  
wouldn't work without it since anyone else submitting to any other  
queue wouldn't even get scheduled since MAUI couldn't get through the  
whole list of those thousands of jobs (each iteration). By doing this  
set up I get those thousands of jobs out of MAUI so that it can still  
process/schedule the other queue's properly. Also, you are right, I  
do turn it into a "50 jobs at a time" batching system... but only for  
that 1 queue. All the other queue's operate as expected. They don't  
normally have submissions of thousands of jobs at a time.

On Jun 26, 2008, at 9:06 AM, Ronny T. Lampert wrote:

>> I had a similar situation with a user submitting 7,000 jobs at a  
>> time. Like you point out maui can't seem to keep up with  
>> scheduling all of them. After posting to the list it was suggested  
>> that I create a routing queue in torque:
>> create queue physics
>> set queue physics queue_type = Route
>> set queue physics acl_group_enable = True
>> set queue physics route_destinations = pompeii
>> set queue physics enabled = True
>> set queue physics started = True
>> Then for the destination queue pompeii I put in the following rule:
>> set queue pompeii max_queuable = 50
>> This setup is working well. Torque manages to keep 50 jobs in the  
>> pompeii execution queue at all times. Maui is happy since it  
>> doesn't have to go through thousands of jobs each iteration, which  
>> it couldn't run anyhow due to lack of resources. (I wish we had  
>> thousands ;-)).
> Please note that ANY! newer jobs that might trigger preemption will  
> NO LONGER WORK with this setup, since maui is only using its  
> scheduling algorithms on those 50 jobs.
> Same with higher prio jobs or similar that will/must/should be  
> executed ASAP.
> You essentially turn your setup into a "50 jobs a at time" batching  
> system.
> So, depending on your needs you should increase the max_queueable.
> Before maui I managed to run a heavily patched pbs_sched (early  
> torque releases) with I think around 20k+ jobs queued.
> After that I abandoned that setup because I needed preemption  
> (sorry, no docs left from that time).
> I had maui running with 10k+ jobs (and changed the #define so it  
> would consider 8K instead of 4K jobs for real scheduling), but it's  
> not nice and it'll eat memory like it's sugar (500MB+ RSS).
> And I still think scheduling over 8K jobs is far too less for such  
> a system.
> Because ATM I no longer have this setup in operation I did stop  
> working privately on maui to remedy those shortcommings.
> BR,
> Ronny
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