Ralph,

I have the same issue and I've been searching how to do this, but I couldn't find. 

What exactly must be the string in the host info key to do what Rodrigo described?

<<< Inside your master, you would create an MPI_Info key "host" that has a value 
<<< consisting of a string "host1,host2,host3" identifying the hosts you want 
<<< your slave to execute upon. Those hosts must have been included in 
<<< my_hostfile. Include that key in the MPI_Info array passed to your Spawn.

I tried to do what you said above but ompi ignores the repetition of hosts. Using Rodrigo's example I did:

host info key = "m1,m2,m2,m2,m3" and number of processes = 5 and the result was

m1 -> 2
m2 -> 2
m3 -> 1

and not

m1 -> 1
m2 -> 3
m3 -> 1

as I wanted.

Thanks in advance.

Thatyene Ramos

On Fri, May 13, 2011 at 9:16 PM, Ralph Castain <rhc@open-mpi.org> wrote:
I believe I answered that question. You can use the hostfile info key, or you can use the host info key - either one will do what you require.

On May 13, 2011, at 4:11 PM, Rodrigo Silva Oliveira wrote:

Hi,

I think I was not specific enough. I need to spawn the copies of a process in a unique mpi_spawn call. It is, I have to specify a list of machines and how many copies of the process will be spawned on each one. Is it possible?

I would be something like that:

machines     #copies
m1                1
m2                3
m3                1

After an unique call to spawn, I want the copies running in this fashion. I tried use a hostfile with the option slot, but I'm not sure if it is the best way.

hostfile:

m1 slots=1
m2 slots=3
m3 slots=1

Thanks

--
Rodrigo Silva Oliveira
M.Sc. Student - Computer Science
Universidade Federal de Minas Gerais
www.dcc.ufmg.br/~rsilva
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