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Old 05-31-2008, 12:48 AM   #1
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MPICH Problem

i hv two systems one is linux1 and another is localhost.localdomain. i hv established NFS server successfully. ssh is also working. now i have install MPICH on linux1 machine and trying to test script ./tstmachines and i am getting below error. any help will be appreciated.

]# ./tstmachines
root@linux1's password:
root@localhost.localdomain's password:
root@linux1's password:
root@localhost.localdomain's password:
Errors while trying to run ssh localhost.localdomain -n /bin/ls /usr/local/mpich-1.2.7p1/bin/mpichfoo
Unexpected response from localhost.localdomain:
--> /bin/ls: /usr/local/mpich-1.2.7p1/bin/mpichfoo: No such file or directory
The ls test failed on some machines.
This usually means that you do not have a common filesystem on
all of the machines in your machines list; MPICH requires this
for mpirun (it is possible to handle this in a procgroup file; see
the documentation for more details).

Other possible problems include:
The remote shell command ssh does not allow you to run ls.
See the documentation about remote shell and rhosts.
You have a common file system, but with inconsistent names.
See the documentation on the automounter fix.

root@linux1's password:

1 errors were encountered while testing the machines list for LINUX
Only these machines seem to be available
Old 05-31-2008, 08:39 PM   #2
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Have you set up passwordless rsh or ssh between the machines. I think MPICH uses rsh by default but can be configured to use SSH. You can use /etc/hosts.equiv so that you can setup passwordless RSH (less secure) or set up SSH host keys for passwordless SSH (or use shosts.equiv) (more secure mechanism). BTW, unless you need MPICH-1 specifically, version 2 is out and either it or OpenMPI will likely give you better performance.


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