Glad you found the problem.
Don't worry about the '--num_proc 3'. This does not refer to the number
of application processes, but rather the number of 'daemon' processes
plus 1 for mpirun. However, this is an internal interface which changes
on different versions of Open MPI, so this explanation is subject to
change :)
Tim
Jorge Parra wrote:
Hi Tim,
Thank you for your reply.
You are right, my openMPI version is rather old. However I am stuck with
it while I can compile v1.2.4. I have had some problems with it (I already
opened a case on Oct 15th).
You were also right about my hostname. uname -n reports (none) and the
"hostname" command did not exist in the nodes of my cluster. I already
added it to the nodes and modified the /etc/hosts file. The error went
away and now I can see that orted runs in the remote node. It is strange
to me that orted runs with --num_proc 3 when mpirun was executed with -np
2. Does this sound correct to you? I might open a new case for it
though...
Thank you for your help,
Jorge
On Mon, 22 Oct 2007, Tim Prins wrote:
Sorry to reply to my own mail.
Just browsing through the logs you sent, and I see that 'hostname' should be
working fine. However, you are using v1.1.5 which is very old. I would
strongly suggest upgrading to v1.2.4. It is a huge improvement over the old
v1.1 series (which is not being maintained anymore).
Tim
On Monday 22 October 2007 08:41:30 pm Tim Prins wrote:
Hi Jorge,
This is interesting. The problem is the universe name:
root@(none):default-universe
The "(none)" part is supposed to be the hostname where mpirun is executed.
Try running:
hostname
and:
uname -n
These should both return valid hostnames for your machine.
Open MPI pretty much assumes that all nodes have a valid (preferably
unique) hostname. If the above commands don't work, you probably need to
fix your cluster.
Let me know if this does not work.
Thanks,
Tim
On Thursday 18 October 2007 09:22:09 pm Jorge Parra wrote:
Hi,
When trying to execute an application that spawns to another node, I
obtain the following message:
# ./mpirun --hostfile /root/hostfile -np 2 greetings
Syntax error: "(" unexpected (expecting ")")
-------------------------------------------------------------------------
- Could not execute the executable
"/opt/OpenMPI/OpenMPI-1.1.5b/exec/bin/greetings
": Exec format error
This could mean that your PATH or executable name is wrong, or that you
do not
have the necessary permissions. Please ensure that the executable is
able to be
found and executed.
-------------------------------------------------------------------------
-
and in the remote node:
# pam_rhosts_auth[183]: user root has a `+' user entry
pam_rhosts_auth[183]: allowed to root@192.168.1.102 as root
PAM_unix[183]: (rsh) session opened for user root by (uid=0)
in.rshd[184]: root@192.168.1.102 as root: cmd='( ! [ -e ./.profile ] || .
./.pro
file; orted --bootproxy 1 --name 0.0.1 --num_procs 3 --vpid_start 0
--nodename 1
92.168.1.103 --universe root@(none):default-universe --nsreplica
"0.0.0;tcp://19
2.168.1.102:32774" --gprreplica "0.0.0;tcp://192.168.1.102:32774"
--mpi-call-yie
ld 0 )'
PAM_unix[183]: (rsh) session closed for user root
I suspect the command that rsh is trying to execute in the remote node
fails. It seems to me that the first parenthesis in cmd='( ! is not well
interpreted, thus causing the syntax error. This might prevent .profile
to run and to correctly set PATH. Therefore, "greetings" is not found.
I am attaching to this email the appropiate configuration files of my
system and openmpi on it. This is a system in an isolated network, so I
don't care too much for security. Therefore I am using rsh on it.
I would really appreciate any suggestions to correct this problem.
Thank you,
Jorge
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