[mpich-discuss] All the outputs are coming on the root node

[Pavan Balaji]

On 10/09/2010 08:31 AM, Akshey Jawa wrote:
> I am new to MPI. I have written a program to run different instances of
> a simulator on different nodes of a cluster(with each node running a
> single instance). The problem is that the output of the different
> instances of the simulator(which are running on different nodes) is
> being shown on the node with rank 0. Due to this, I am not able to find
> out that which lines of the output belong to which instance. Can you
> please help me out? Is it possible to have the rank of the node prefixed
> to each line of the output which the node sends to the root node? Please
> note that I want the output while the simulation is going on and that
> too preferably on the root node itself (otherwise I can simply redirect
> the output to a file while running the simulator).

Are you using MPICH2? Which version?

All of the output should be redirected to whichever node is running 
"mpiexec". You can prefix it with the process rank by passing the option 
"-l" to mpiexec.

  -- Pavan

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji