OpenMPI 1.4.3 mpirun hostfile error
I am trying to run a simple MPI program on 4 nodes. I am using OpenMPI 1.4.3 running on Centos 5.5. When I submit the MPIRUN Command with the hostfile/machinefile, I get no output, receive a 开发者_JS百科blank screen. Hence, I have to kill the job. .
I use the following run command: : mpirun --hostfile hostfile -np 4 new46
OUTPUT ON KILLING JOB:
mpirun: killing job...
--------------------------------------------------------------------------
mpirun noticed that the job aborted, but has no info as to the process that caused
that situation.
--------------------------------------------------------------------------
mpirun was unable to cleanly terminate the daemons on the nodes shown
below. Additional manual cleanup may be required - please refer to
the "orte-clean" tool for assistance.
--------------------------------------------------------------------------
myocyte46 - daemon did not report back when launched
myocyte47 - daemon did not report back when launched
myocyte49 - daemon did not report back when launched
Here is the MPI program I am trying to execute on 4 nodes
**************************
if (my_rank != 0)
{
sprintf(message, "Greetings from the process %d!", my_rank);
dest = 0;
MPI_Send(message, strlen(message)+1, MPI_CHAR, dest, tag, MPI_COMM_WORLD);
}
else
{
for (source = 1;source < p; source++)
{
MPI_Recv(message, 100, MPI_CHAR, source, tag, MPI_COMM_WORLD, &status);
printf("%s\n", message);
}
****************************
My hostfile looks like this:
[amohan@myocyte48 ~]$ cat hostfile
myocyte46
myocyte47
myocyte48
myocyte49
*******************************
I ran the above MPI program independently on each of the nodes and it compiled and ran just fine. I have this issue of "Daemon did not report back when launched" when I use the hostfile. I am trying to figure out what could be the issue.
Thanks!
I think these lines
myocyte46 - daemon did not report back when launched
are pretty clear -- you're having trouble either launching the mpi daemons or communicating with them afterwards. So you need to start looking at networking. Can you ssh without password into these nodes? Can you ssh back? Leaving aside the MPI program, can you
mpirun -np 4 hostname
and get anything?
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