madhave i sent it to the entire beowulf mailing list. if you don't want to receive emails i recommend you unsubscribe from the list.
On Wed, Apr 22, 2009 at 8:55 AM, Madhav A <[email protected]> wrote: > Plz don't send mail to me. > Plzzzzzzzzzzzzzzzzzzzzz dear > > > > Regards, > Madhav.A > > On Wed, Apr 22, 2009 at 12:19 PM, Jonathan Aquilina < > [email protected]> wrote: > >> in regards to the models you run couldnt you wait until your about to >> leave for the day and let it run over night? to be honest i dont have much >> of a need for clustering at the moment. the only thing i can really run on >> this windows monster is boinc projects which i do. also gus doesnt the >> amount of cache play a role in regards to be able to working on the machine >> while crunching numbers, wont it keep swapping, etc to a minimum? >> >> On Wed, Apr 22, 2009 at 12:36 AM, Gus Correa <[email protected]>wrote: >> >>> Glen Beane wrote: >>> >>>> >>>> >>>> >>>> On 4/21/09 3:46 PM, "Jonathan Aquilina" <[email protected]> wrote: >>>> >>>> is it possible to have a single multicored machine as a cluster? >>>> >>>> >>>> >>>> That wouldn’t exactly be a cluster, would it? But you can certainly run >>>> a lot of the software associated with Beowulf clusters: a batch system >>>> (TORQUE, SGE, etc), MPI, ... so in practice you can use your 8 core >>>> workstation just like you would a cluster. >>>> >>>> >>>> -- >>>> Glen L. Beane >>>> Software Engineer >>>> The Jackson Laboratory >>>> Phone (207) 288-6153 >>>> >>>> >>>> >>> Hi Jonathan, Glen, list >>> >>> Along the lines that Glen pointed out, >>> I setup a dual-socket dual-core workstation here with OpenMPI >>> and MPICH2, plus Torque, to run some of our atmosphere modeling code >>> in batch mode. >>> It is not really a cluster, but a workstation >>> with some software characteristic of a cluster. >>> >>> We tend to have long series of atmospheric model runs, where >>> each one-year simulation restarts from the previous state where >>> the last run stopped. >>> Each run can take, say, half a day to complete, >>> and the whole series may take a week to a month to finish. >>> Queuing the jobs up on Torque/PBS, >>> and forgetting about them until the whole series is done is >>> very convenient. >>> >>> This setup works fine as long as the workstation is relatively idle. >>> However, if/when the owner decides to run heavy data analysis >>> Matlab scripts interactively while the MPI jobs are running, >>> then we get to memory contention, swapping, and all those bad things >>> that kill performance and may even break MPI jobs. >>> This "time shared" interactive activity, that is typically absent in >>> cluster nodes, is germane to workstations. >>> >>> Fortunately, I could convince the workstation owner (who also wants >>> the output of the atmospheric model runs) to do heavy interactive >>> use only when there aren't jobs on the Torque queue. >>> Or to suspend the job queue, wait for running jobs to complete, >>> work interactively, then restart the queue. >>> >>> You can think of other heavy interactive use (e.g. streaming video) >>> that can produce the same negative impact on MPI jobs, >>> and you may need to adopt a similar >>> policy to avoid conflict between interactive and batch use >>> in your workstation, if you set it up "as a cluster". >>> >>> My two cents. >>> >>> Gus Correa >>> --------------------------------------------------------------------- >>> Gustavo Correa >>> Lamont-Doherty Earth Observatory - Columbia University >>> Palisades, NY, 10964-8000 - USA >>> --------------------------------------------------------------------- >>> >>> _______________________________________________ >>> Beowulf mailing list, [email protected] sponsored by Penguin Computing >>> To change your subscription (digest mode or unsubscribe) visit >>> http://www.beowulf.org/mailman/listinfo/beowulf >>> >> >> >> >> -- >> Jonathan Aquilina >> >> _______________________________________________ >> Beowulf mailing list, [email protected] sponsored by Penguin Computing >> To change your subscription (digest mode or unsubscribe) visit >> http://www.beowulf.org/mailman/listinfo/beowulf >> >> > -- Jonathan Aquilina
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