ok,
Thanks,
Have a nice day,
Cheers,
Imran
Brian Barrett <brbarret_at_[hidden]> wrote: On Apr 4, 2006, at 11:45 PM, imran shaik wrote:
> You said 70 processes, is it for the whole cluster or on a single
> node. I am using a two node cross cable connected openMosix
> cluster. Please let me know how can i get more processes on the
> machines available. My processes are 1.4 to 1.5 MB for sure. Any
> solutions or suggestions to solve this problem are welcome.
That's ~70 processes per any one node. There really isn't a way to
bump this number up in LAM/MPI.
Brian
> Brian Barrett
wrote: On Apr 4, 2006, at
> 10:01 AM, imran shaik wrote:
>
> > I want to run around 200 MPI processes. I have two p4,256MB nodes
> > connected via cross cable. I have installed redhat9 on it. Now i am
> > able to run 90 simple "hello world" processes. If i exceed it says,
> > no of clients for lamboot exceeded. It says 72 is the limit. But i
> > get 90, dont know how.Anyways i need to execute more processes
> > (around 200 ) on these nodes i have. Can any one suggest any way to
> > do that?
> >
> > Also can anyone say whats the problem i am getting. Is it any
> > unusual thing ?
>
> You are running out of internal resources in our process control
> daemons. The limits are fairly fixed size, somewhere around 70 or so
> (I'm not sure how it launched 90, but it's possible we bumped up the
> limits a bit somewhere along the line). LAM/MPI really wasn't
> designed to try to start hundreds of processes on a single node, as
> it was more designed for clusters with small numbers of CPUs / node
> and oversubscribing nodes by orders of magnitude is generally
> considered bad form in the HPC community. I'm afraid this isn't
> something with an easy work-around.
>
> You may get better results trying Open MPI (the successor to LAM/
> MPI), although you might not. Resources are going to get really
> constrained - you're looking at less than 1.5MB memory / process,
> which isn't going to make most modern apps very happy.
>
> Brian
>
>
> --
> Brian Barrett
> LAM/MPI developer and all around nice guy
> Have a LAM/MPI day: http://www.lam-mpi.org/
>
>
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