This question is related to OpenMPI 2.0.1 compiled with GCC 4.8.2 on RHEL 6.8 using Torque 6.0.2 with Moab 9.0.2. To be clear, I am an administrator and not a coder and I suspect this is expected behavior but I have been asked by a client to explain why this is happening.
Using Torque, the following command returns the hostname of the first node only, regardless of how the nodes/cores are split up: mpirun -np 20 echo "Hello from $HOSTNAME" (the behaviour is the same with "echo $(hostname)) The Torque script looks like this: #PBS -V #PBS -N test-job #PBS -l nodes=2:ppn=16 #PBS -e ERROR #PBS -o OUTPUT cd $PBS_O_WORKDIR date cat $PBS_NODEFILE mpirun -np32 echo "Hello from $HOSTNAME" If the echo statement is replaced with "hostname" then a proper response is received from all nodes. While I know there are better ways to test OpenMPI's functionality, like compiling and using the programs in examples/, this is the method a specific client chose. I was using both the examples and a Torque job script calling just "hostname" as a command and not using echo and the client was using the script above. It took some doing to figure out why he thought it wasn't working and all my tests were successful and when I figured it, he wanted an explanation that's beyond my current knowledge. Any help towards explaining the behaviour would be greatly appreciated. -- Regards, Mark L. Potter Senior Consultant PCPC Direct, Ltd. O: 713-344-0952 M: 713-965-4133 S: mpot...@pcpcdirect.com _______________________________________________ users mailing list users@lists.open-mpi.org https://rfd.newmexicoconsortium.org/mailman/listinfo/users
