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

___________________________________________________
郔陔唳 Yahoo!藻撈籵? 7.0ㄛ轎愐鋒繚??斕湖ㄐ
http://messenger.yahoo.com.tw/
_______________________________________________
users mailing list
users@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/users

___________________________________________________
最新版 Yahoo!奇摩即時通訊 7.0，免費網路電話任你打！
http://messenger.yahoo.com.tw/