[Swift-devel] submitting jobs to the queue

[Veronika V. Nefedova]

Right. Teragrid at NCSA has the limit of 384 queued or running jobs per user.

Nika

At 05:19 PM 3/7/2007, Mihael Hategan wrote:
>On Wed, 2007-03-07 at 16:58 -0600, Veronika V. Nefedova wrote:
> > OK, Here is my another question.
> > Teragrid allows the user to have 385 jobs in a queue. If I run my complete
> > workflow (244 molecules), on stage four I'll have 80 times 244 jobs (i.e.
> > close to 20K). How do I set the limit for the number of submitted jobs to
> > the queue to 385 ? I remember that condor had a specific parameter to
> > condor_submit that was managing exactly that...
>
>Is this 385 jobs per site?
>
> >
> > Nika
> >
> > At 04:36 PM 3/7/2007, Mihael Hategan wrote:
> > >On Wed, 2007-03-07 at 16:30 -0600, Veronika V. Nefedova wrote:
> > > > Hi,
> > > >
> > > > I've noticed one very strange behavior. For example, I have 68 jobs 
> to be
> > > > submitted to the remote host simultaneously. Swift submits at first
> > > just 26
> > > > jobs. I checked that several times - its always 26 jobs. Then, when at
> > > > least one job out of those 26 is finished - swift goes ahead and 
> submits
> > > > the rest (all of those left - 42 in my case).
> > > > Is it a bug or a feature?
> > >
> > >Feature. Although it should probably be tamed down in the one site case.
> > >Each site has a score that changes based on how it behaves. If a site
> > >completes jobs ok, it gets a higher score in time. If jobs fail on it,
> > >it gets a lower score.
> > >
> > >Now, let's consider the following scenario: 2 sites, one fast one slow.
> > >With no scores and no limitations, half of the jobs would go to one, and
> > >half to the other. The workflow finishes when the slow site finishes
> > >half the jobs.
> > >What happens however, is that Swift limits the number of initial jobs,
> > >and does "probing". This allows it to infer some stuff about the sites
> > >by the time it gets to submit lots of jobs. It should yield better
> > >performance on larger workflows with imbalanced sites, which is, I'm
> > >guessing, our main scenario.
> > >
> > > >
> > > > Nika
> > > >
> > > > _______________________________________________
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> > > > Swift-devel at ci.uchicago.edu
> > > > http://mail.ci.uchicago.edu/mailman/listinfo/swift-devel
> > > >
> >
> >