Re: [OMPI users] rsh/ssh is work but mpirun hang ?

[Jeff Squyres (jsquyres)]

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-boun...@open-mpi.org [mailto:users-boun...@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)" <jsquy...@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-boun...@open-mpi.org 
[mailto:users-boun...@open-mpi.org] On Behalf Of shen T.T.
                        Sent: Wednesday, June 21, 2006 11:01 AM
                        To: us...@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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