[Swift-devel] submitting jobs to the queue

[Mihael Hategan]

On Fri, 2007-03-09 at 12:24 -0600, Veronika V. Nefedova wrote:
> So this maxSimultaneousJobs parameter would control the number of jobs I 
> have on any particular site, correct ?

No. That controls the number of concurrent jobs in one swift scheduler
instance (right now that == one swift invocation).

>  For example, if I have now say 50 
> running jobs and then submit another workflow that has this parameter set - 
> would it submit an additional 384 jobs, or only enough amount to make the 
> total number of jobs from 2 workflows to equal to 384 ?

The maxSimulatneousJobs throttle is applied after the scoring stuff. You
would have to make sure you increase the jobThrottle I mentioned and
then set maxSimultaneousJobs.

> 
> Nika
> 
> At 06:20 PM 3/7/2007, Mihael Hategan wrote:
> >So this limit would have to be a per-site limit.
> >There is no such thing right now. You can limit the total number of
> >concurrent jobs, but it's not exposed through swift.properties.
> >
> >In libexec/scheduler.xml, you can try adding the following thing inside
> ><scheduler>...</scheduler>:
> >
> ><property name="maxSimultaneousJobs" value="384"/>
> >
> >Mihael
> >
> >On Wed, 2007-03-07 at 17:27 -0600, Veronika V. Nefedova wrote:
> > > 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
> > > > > > >
> > > > > > > _______________________________________________
> > > > > > > Swift-devel mailing list
> > > > > > > Swift-devel at ci.uchicago.edu
> > > > > > > http://mail.ci.uchicago.edu/mailman/listinfo/swift-devel
> > > > > > >
> > > > >
> > > > >
> > >
> > >
> 
>