[Oscar-users] error running a simple Hello MPI code

[Michelle Chu]

I tried to run a simple hello MPI program under /opt/mpich-ch_p4-gcc-1.2.7/examples/
at my headnode, I compile the hello++.cc program
make hello++
./hello++
"hello world, i am 0 out of 1"

however, if i type  mpirun -np 4 -nolocal -machinefile machines4 hello++
in my machinefile
oscarnode1
oscarnode2
oscarnode3
oscarnode4

error message "bash: /opt/mpich-ch_p4-gcc-1.2.7/examples/hello++: No such file or directory"

Why is that?
Michelle