[Mauiusers] blocked jobs never run

Roy Dragseth roy.dragseth at cc.uit.no
Thu Nov 25 01:37:28 MST 2010


On Thursday, November 25, 2010 09:33:16 Roy Dragseth wrote:
> On Thursday, November 25, 2010 02:26:57 William G Wichser wrote:
> > They are given higher priorirty but because of the fact that they cannot
> > fit, they go into mthe blocked state and never get scheduled.  I given
> > wide jobs much higher weights.  But again, because there are not enough
> > nodes ever available at one time, they sit blocked with less wide jobs
> > keep getting scheduled due only to available cores.
> 
> With blocked, do you mean that they are in Idle state or Deferred state?
> 
> I assume your jobs are Idle, that is, do the largest jobs stay on the top
> of the list when you do showq -i.  (If not, you have set some throttling
> policies in maui that prevent them from becoming eligible for scheduling.)
> 
> Have you set the RESERVATIONDEPTH in maui.cfg?
> 
> We have set
> 
> RESERVATIONDEPTH 3
> BACKFILLPOLICY        FIRSTFIT
> RESERVATIONPOLICY     CURRENTHIGHEST
> 
> to make the three jobs with highest priority set reservations on nodes so
> they can build up resources over time until they are able to start. 
> Backfill makes it possible to fill in shorter jobs while the big jobs are
> waiting to start.

Another small thing:

If your highest priority jobs have reservations their job-id will have a * 
attached when you do showq -i.

r.


-- 

  The Computer Center, University of Tromsø, N-9037 TROMSØ Norway.
	      phone:+47 77 64 41 07, fax:+47 77 64 41 00
        Roy Dragseth, Team Leader, High Performance Computing
	 Direct call: +47 77 64 62 56. email: roy.dragseth at uit.no


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