Hi Changsheng Thank you very much for your solution. The program runs well now :)
Regards. On Tue, Apr 20, 2010 at 3:54 PM, Changsheng Jiang <jiangzuo...@gmail.com>wrote: > I have encountered the same problem too. > > By gdb attached, it's show that the processes are in a loop of (e)poll. > After configuring the network interface in ~/.openmpi/mca-params.conf using > btl_tcp_if_include, all hosts work fine. > > just fyi. > Changsheng Jiang > > > On Tue, Apr 20, 2010 at 14:39, long thai <thaithanhlong2...@gmail.com>wrote: > >> 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. >> >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users >> > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
