This *may* be due to stdio blocking issues (e.g., not getting the password/passphrase to ssh properly, so the application never actually launches on the remote node).
 
The first thing I would do is find out why you are getting prompted for a password.  Open MPI requires that you are not prompted -- check out our FAQ on the issue:
 
http://www.open-mpi.org/faq/?category=rsh
 
In particular:
 
http://www.open-mpi.org/faq/?category=rsh#ssh-keys
 
Once you get that going, try OMPI's mpirun again and see if it works without hanging.  I'd first try launching non-MPI applications such as "hostname" or "uptime".  If those work, then try your MPI hello world program.


From: users-bounces@open-mpi.org [mailto:users-bounces@open-mpi.org] On Behalf Of shen T.T.
Sent: Wednesday, June 28, 2006 9:09 AM
To: Open MPI Users
Subject: Re: [OMPI users] rsh/ssh is work but mpirun hang ?

If i mpirun the MPI application--'hello world' on a single computer(dual core) itself, it is work. But it can't be successful when i mpirun it across multiple nodes. The rsh/ssh agent is work, i can rsh/ssh to other nodes.Everytime i mpirun 'hostname' , the remote rsh/ssh agent ask for the password.I enter the password but the Openmpi is hang. It is just hang and nothing else.
I don't know what happen to my Openmpi enviroment or operating system.
 
Would you ever encount this problem?  

Vincent
"Jeff Squyres (jsquyres)" <jsquyres@cisco.com> 說:
Can you provide a little more information?
 
What exactly are you trying to mpirun across multiple nodes?  Is it an MPI application or a non-MPI application?  For example, can you mpirun "hostname" (i.e., the Unix hostname utility) across multiple nodes successfully?
 
If you're trying to mpirun a user application, what application is it?  Can you mpirun a trivial MPI application (e.g., hello world) successfully?
 
Thanks.


From: users-bounces@open-mpi.org [mailto:users-bounces@open-mpi.org] On Behalf Of shen T.T.
Sent: Wednesday, June 21, 2006 11:01 AM
To: users@open-mpi.org
Subject: [OMPI users] rsh/ssh is work but mpirun hang ?

I have installed the openmpi -1.0.2 on the Fedora Core5 operating system. I use the Intel Fortran compiler. I can rsh/ssh  to the other processor in our cluster( 2 PC's , 4cores). I can mpirun on a processor itself successfully. When i mpirun on  2 PC's, after entering the password, the program will be hung!  
 
Does anyone encounter this problem?How do i check and fix it?
 
Thanks in advance 
 
Vincent
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