Hi Francisco, On 2014/06/13 16:28, Francisco Pastor wrote:

As I'm using mpich2-1.0.5 I just need an mpd.hosts file in the directory I'm running the executable. Yesterday I installed mpich3.1 and compiled my application but running issued an error about a shared library so I went back to mpich2. Maybe I should upgrade.

Going back to mpich2, yes I can run

mpirun -n 40 hostname > log.hostname

both from shell and at, yielding names of the five nodes.

But if run from crontab log.hostname is empty (0 size). Maybe the problem is crontab and not application related.

hummm this is likely due to the environment not being set within cron. can you run the following script from both shell and crontab and look for the differences ? pwd > log.hostname 2>&1 which mpirun >> log.hostname 2>&1 ldd `which mpirun` >> log.hostname 2>&1 ulimit -a >> log.hostname 2>&1 mpirun -n 40 hostname >> log.hostname 2>&1 Cheers, Gilles