On 04/30/2013 05:55 AM US Central Time, Siegmar Gross wrote:

It seems, that I don't need a path, if the command has the same path on both machines. It breaks, if the program has different pathnames.

From the launching logic, I don't know how that'll be true. I just tested this as well and it works fine for me.

sunpc1 fd1026 108 mpiexec -np 2 -host sunpc1,linpc1 hostname sunpc1 [proxy:0:1@linpc1] HYDU_create_process (../../../../mpich-3.0.2/src/pm/hydra/utils/launch/launch.c:74): execvp error on file hostname (No such file or directory)

My guess is that "hostname" one of the machines is on your path and the other is not.

linpc1 fd1026 105 mpiexec -np 2 -host sunpc1,linpc1 hostname linpc1 sunpc1

Are all of /bin /usr/local/bin and /usr/bin in your path? -- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji