Hi
I have a quadricore system with REDHAT Enterprise version 5 64 bit.
I have MPICH on the system and need to run a parallel application with mpirun.
When I run mpirun by specifying the number of processors as 1,2,3 or 4 processors
I get the error message
p0_24205: p4_error: Could not gethostbyname for host NASSAU; may be invalid name
: 61
It seems that mpirun is not able to find the hostname. Here my hostname is NASSAU
Earlier the hostname was LINUX. I changed it later to NASSAU.
Do I need to change any other parameters. Is the system still recognising LINUX as the hostname ? I have also enabled rsh service as MPICH uses rsh.
Thanks for your help
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also check your /etc/nsswitch.conf for the hosts line. it should look something like this
which means it check first hosts file then dns and then nis
remove dns or nis as needed. just make sure files is first and the [NOTFOUND=return] is last. anything after it will be ignored
hosts: files dns nis [NOTFOUND=return]
another thing im doing is when running on one host i specify host name as localhost.
im using mpiexec ( mpich2 ) though.
mpiexec -localonly -rsh -nopm -np 8 -machinefile machines `pwd`/exec
BTW you can run jobs using ssh and not only rsh.
just alias rsh to ssh and make sure there is a shared home dir between all nodes
and you have exchanged ssh keys.
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by: 0renPosted on 2009-06-05 at 03:31:09ID: 24554989
do you have NASSAU record in your /etc/hosts file ?
if not then add one.
how do you specify mpich which nodes to use ?