Hi, > After compiling it, I copied it over to the other machine and tried > running it with: > > mpirun -v --mca btl self,tcp -np 4 --machinefile machines /mnt/mpihw > > which produces:
[.....] > AFAIK, the machines are able to communicate with each other on any port > you like, just not with MPI. Any idea what's wrong? The stable branch (1.2.x) works perfectly but _only_ when the communication channel between machines are in the same subnet. (ethernet) Since you don't have that much control over which subnet your machines get in, OpenMPI has a tendency to fail in Amazon's EC2. However, if you're able to compile and use a version of the development branch (1.3) you should be use compile and run the "hello world" program without problems, regardless of the subnet they're in. Regards, Jeroen Kleijer
