Some more hints to the issue: If I start process A and this process spawns processes B and C (using MPI_Comm_spawn), stdout works fine only for process A.
Sergio -----Original Message----- From: Brignone, Sergio Sent: Monday, May 01, 2006 1:17 PM To: Open MPI Users Subject: Re: [OMPI users] stdout in AIX Hi Brian, I tried what you suggested (piping out stdout) but it did't work. Sergio -----Original Message----- From: Brian Barrett [mailto:brbar...@open-mpi.org] Sent: Monday, May 01, 2006 11:14 AM To: Open MPI Users Subject: Re: [OMPI users] stdout in AIX On May 1, 2006, at 1:58 PM, Brignone, Sergio wrote: > 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 > mpirun: > > mainaix:/xahome/userx> ./hello0 > Process 0 of 1 is on ecc1ap04 > Process 0 says Hello Word! > mainaix:/xahome/userx > mpirun -n 4 hello0 > mainaix:/xahome/userx > > > 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? It's possible that we broke pty handling on AIX. Just out of curiosity, what happens if you try something like: mpirun -np 1 uptime | cat This will cause mpirun to think stdout is connected to a pipe instead of a pty, so we won't try to use our pty code (and default to standard pipes for stdio forwarding). Brian -- Brian Barrett Open MPI developer http://www.open-mpi.org/
