[Mauiusers] Standing reservations and MOM restarts - Bug?

Garrick Staples garrick at clusterresources.com
Wed Mar 28 16:02:56 MDT 2007

On Wed, Mar 28, 2007 at 12:16:16AM -0700, Jay Srinivasan alleged:
> Hi,
> In moab/MRes.c in the MNodeUpdateResExpression() routine (around line
> 4075 in Maui-3.2.6p19), the check for MaxTasks and TaskCount, which is
> if ((R->MaxTasks > 0) && (R->TaskCount >= R->MaxTasks)) continue;
> I think, will check to see if the task count for the SR is more than the
> SRMAXTASKS parameter and then continue to the next SR and not update the
> current SR with the node(s) in the RegExp under consideration.
> But, in Maui atleast, it does not seem that the SRMAXTAKS parameter is
> even honored (nor do setres or MResCreate() even take it as a
> parameter), and so it seems that MaxTasks is always zero in this case
> for SRs.
> Thus, everytime a pbs_mom is recycled, this routine ends up adding the
> node that just came up to the SR nodelist, whether the node was on the
> list originally or not. This results in the SR gradually growing in size.
> I think the fix for this is to simply check for a possible MaxTasks
> value of 0 as well, i.e.
> if ((R->MaxTasks >= 0) && (R->TaskCount >= R->MaxTasks)) continue;
> Could someone who has a better knowledge of Maui internals please
> confirm that this is the case or let me know if I am not correct?

I can't comment directly on the problem, but I can say that Maui doesn't
talk to pbs_mom and I can't think of any reason why restarting pbs_mom
could effect Maui.

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