I wrote a simple program to display "hello world" from each process.

When I run this (126 - my machine, 122, and 123), everything works fine:
[doriad@daviddoria MPITest]$ mpirun -H 10.1.2.126,10.1.2.122,10.1.2.123 hello-mpi
>From process 1 out of 3, Hello World!
From process 2 out of 3, Hello World!
From process 3 out of 3, Hello World!

When I run this (126 - my machine, 122, and 125), everything works fine:
[doriad@daviddoria MPITest]$ mpirun -H 10.1.2.126,10.1.2.122,10.1.2.125 hello-mpi
>From process 2 out of 3, Hello World!
From process 1 out of 3, Hello World!
From process 3 out of 3, Hello World!

When I run this (126 - my machine, 123, and 125), everything works fine:
[doriad@daviddoria MPITest]$ mpirun -H 10.1.2.126,10.1.2.123,10.1.2.125 hello-mpi
>From process 2 out of 3, Hello World!
From process 1 out of 3, Hello World!
From process 3 out of 3, Hello World!

However, when I run this (126 - my machine, 122, 123, AND 125), I get no output at all.

Is there any way to check what is going on / does anyone know what that would happen? I'm using OpenMPI 1.3.3

Thanks,

David