Hi there, I got the following error message when I try to execute an mpirun command... mpiexec_op710n2 (mpiexec 437): mpiexec: from man, invalid msg=:{}: Any idea? Thanks in advance, Jonathan -- Jonathan Marti Barcelona Supercomputing Center Centro Nacional de Supercomputación WWW: http://www.bsc.es email: jonathan.marti at bsc.es