Hi all. I'm just using OpenMPI for few days. I'll try to run a simple MPI program, the program is ProcessColors which I get from CI-Tutor<http://ci-tutor.ncsa.illinois.edu/content.php?cid=1091>. I have 2 hosts, if I run the program separately on each one, it runs well. However, if I run it on two hosts using following command: *mpirun --host host1,host2 --preload-binary -np 8 ProcessColors*. The program hangs.
When I use command *ps -A* to check running process, I find out that there is 4 processes running on each host. So, I think that there is a deadlock on my program, but why it runs well with single host? All those following commands run without any problem on both machine: - mpirun -np 8 ProcessColors - mpirun --host host1 -np 8 ProcessColors - mpirun --host host2 -np 8 ProcessColors Later, I found out that the problem comes when the remote host try to send message to the host which root process (process 0) is running, which is the host that I run the command. I don't know why the process is blocked at sending task. Any help from you is precious to me. Regards. Long Thai.
