Hi, try mpirun -np 1 ./conftest With best regards, Shaman Mahmoudi On Mar 14, 2007, at 6:56 AM, Bin wrote: > mpirun -np 1 conftest -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20070314/2e9b755e/attachment.htm>