I've been using open-mpi in Solaris for a while and now I need to use
open-mpi in AIX.
I compiled the latest stable open-mpi version and run one of the
simplest possible tests (see hello0.c in attached zip)
To my surprise, it didn't show anything to the screen when running with
Process 0 of 1 is on ecc1ap04
Process 0 says Hello Word!
mainaix:/xahome/userx > mpirun -n 4 hello0
I also tried with stderr instead of stdout and I got the same result.
Now, if I open a file and stream the output to the file (I just used one
file per process, I didn't use mpi-io), it works!
Any ideas about the reason of this behavior?