> What it sounds like you want to do is use MPI as a bootstrap to launch
> several executables on multiple nodes. While MPI can do that, it's
> not really what it's designed for.
How ???
because the way I am doing it, it is giving errors for reason you just explained.
mpiexec or lamexec, are used to execute non-MPI programs, but how would that help in this case.Would a scheduler be used along with mpiexec to do the task under question.
Thanks alot..
Fahad
> From: jsquyres_at_[hidden]
> To: lam_at_[hidden]
> Date: Wed, 13 Feb 2008 21:27:19 -0500
> Subject: Re: LAM: caused collective abort of all ranks
>
> On Feb 13, 2008, at 4:05 PM, fahad saeed wrote:
>
> > Ok.Let me put it this way.How can i use message passing to execute a
> > binary on different nodes.?
>
> Message passing is not the same thing as launching an executable on
> different nodes. Message passing is sending messages from one process
> to another. The fact that mpirun *also* starts processes on multiple
> nodes is a side-effect -- we have to start the processes before we can
> exchange messages between them.
>
> What it sounds like you want to do is use MPI as a bootstrap to launch
> several executables on multiple nodes. While MPI can do that, it's
> not really what it's designed for. And the fact that you call
> MPI_INIT and then don't call MPI_FINALIZE will always cause errors
> with LAM/MPI.
>
> LAM has a launcher explicitly for non-MPI applications; you probably
> want to use that instead. See the man page for lamexec(1).
>
> >
> > Fahad
> >
> > > From: jsquyres_at_[hidden]
> > > To: lam_at_[hidden]
> > > Date: Wed, 13 Feb 2008 16:02:16 -0500
> > > Subject: Re: LAM: caused collective abort of all ranks
> > >
> > > On Feb 13, 2008, at 2:51 PM, fahad saeed wrote:
> > >
> > > > What would I have to do, if i have to use MPI.I mean isnt this
> > true
> > > > that MPI is for message passing, and the thing that i am trying to
> > > > do is a kind of message passing ?
> > >
> > > I don't see you doing any message passing in your app -- you call
> > > MPI_INIT and then execl() (thereby replacing the MPI process with
> > > bash). There's no sending of messages anywhere.
> > >
> > > > Could you please eloborate more on resource manager, what kind of
> > > > resource manager.
> > >
> > > A resource manager to allocate the nodes in your cluster, such as
> > > SLURM or Torque, etc.
> > >
> > > --
> > > Jeff Squyres
> > > Cisco Systems
> > >
> > > _______________________________________________
> > > This list is archived at http://www.lam-mpi.org/MailArchives/lam/
> >
> > Connect and share in new ways with Windows Live. Get it now!
> > _______________________________________________
> > This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
>
> --
> Jeff Squyres
> Cisco Systems
>
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
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