[mpich-discuss] Help: MPICH for a beginner

[Michele Rosso]

Ok, both the commands

% mpiexec -np 4 hostname

% mpiexec -np 4 ls

work perfectly.
I am sure in my code there are no lines like:

if (my_rank is 0)
   print(...)

and besides it works as expected when it runs on the supercomputer.
I guess I made a mistake somewhere in the settings at this point.
Particularly, how can I avoid to type "./" when invoking an executable?
Is it possible that the output is not redirected to the shell opened in
folder when I am working on?

Thank you for your help.

Michele



On Tue, 2010-07-13 at 11:59 -0500, Pavan Balaji wrote:
> On 07/13/2010 11:47 AM, Michele Rosso wrote:
> > Thanks Pavan for your reply.
> > I followed the instructions.
> > At first I got mpd started, then, after I compiled my code through
> > mpif90, I run the executable by using the command:
> > 
> > mpiexec -np 4 ./filename
> > 
> > This command works properly since I got the results I was expecting, but
> > I have the feeling that it is still running the serial version of the
> > code, since in the output (shell) there are only the output lines of the
> > node 0. Any idea about that?
> 
> Are you sure your program is not doing something like:
> 
> if (my_rank is 0)
>     print(...)
> 
> You can try some other program, maybe "ls" or "hostname":
> 
> % mpiexec -np 4 hostname
> 
> % mpiexec -np 4 ls
> 
> This should give you a separate output for each process.
> 
>   -- Pavan
>