[GE users] qacct WALLCLOCK interpretation

Rayson Ho rayrayson at gmail.com
Tue May 29 18:48:52 BST 2007


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On 5/29/07, Greg Lukeman <glukeman at stfx.ca> wrote:
> Cool.  Thanks.  I'll probably use something like max(WALLCLOCK,CPU)
> for my reporting.

BTW, take a look at their jobs and see if they are really multithreaded...


> Is there any way I can prevent users from running multithreaded when
> they only ask for a serial slot?

Some OSes (eg. Solaris) support CPUset, and Linux provides CPU
affinity masks, but if I recall correctly, the user can override that
setting if they want...

Rayson


>
>
> On 29-May-07, at 1:02 PM, Rayson Ho wrote:
>
> > If they are using more CPUs than SGE allocates them...
> >
> > eg. a multithreaded job (including OpenMP) submitted as a serial job
> > running on an SMP machine.
> >
> > Rayson
> >
> >
> >
> > On 5/29/07, Greg Lukeman <glukeman at stfx.ca> wrote:
> >> Hi All,
> >>
> >> As far as I understand (probably not far), when qacct reports
> >> WALLCLOCK for a job, it sums up the ru_wallclock for each parallel
> >> task.  Similarly when qacct reports CPU for a job, it sums up the cpu
> >> for each parallel task.
> >>
> >> In what situations, then, could qacct show CPU greater than
> >> WALLCLOCK?
> >>
> >> I have some users for whom CPU is significantly (like 7x) greater.
> >>
> >> Cheers,
> >>
> >> Greg
> >>
> >>
> >>
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