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Subject: Re: [OMPI users] Scheduling dynamically spawned processes
From: Ralph Castain (rhc_at_[hidden])
Date: 2011-05-13 08:41:28

On May 12, 2011, at 9:53 PM, Rodrigo Silva Oliveira wrote:

> Hi there.
> I'm developing a distributed system with a communication layer based on Open MPI. As part of my project, I have to create a process scheduler. So I decided to use the MPI_Spawn function to dynamically create (it is an requirement of the system) the process across the cluster's nodes.
> Is there some way to specify how many copies of a process to spawn to each node? For instance, I want to spawn 5 copies of a mpi program to 3 nodes usin the scheme bellow:
> 1 to host 1
> 3 to host 2
> 1 to host 3
> obs.: I am using openmpi-1.5.3. The default policies provided by the ompi is not applicable to my problem because I will decide the scheme based on specific criteria.

Use the "host" info key. You would specify your dynamic spawn as three apps, each running the same executable. It's the equivalent of

mpirun -n 1 -host host1 app : -n 3 -host host2 app : -n 1 -host host3 app

> Thanks in advance.
> --
> Rodrigo Silva Oliveira
> M.Sc. Student - Computer Science
> Universidade Federal de Minas Gerais
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