MPI on linux Exit status=1

Hi, I'm trying to help our local grid computing guys to get NONMEM running with MPI on a Linux based grid. We have NONMEM running with a pnm file asking for 8 nodes but the actual run time is 10% longer than with a regular 'transfer' run. The only clue I can see to the problem is the "Exit status=1" after the "MPI TRANSFER TYPE SELECTED" message. The NONMEM runs appears to execute OK except for no evidence that MPI is operating. Can anybody tell me if this exit status is normal under Linux? If not what might it mean? Nick Recompiling certain components USING PARALLEL PROFILE wfn_mpi8.pnm MPI TRANSFER TYPE SELECTED Exit status = 1 IN MPI Starting MPI version of nonmem execution ... -- Nick Holford, Professor Clinical Pharmacology Dept Pharmacology & Clinical Pharmacology, Bldg 503 Room 302A University of Auckland,85 Park Rd,Private Bag 92019,Auckland,New Zealand tel:+64(9)923-6730 fax:+64(9)373-7090 mobile:+64(21)46 23 53 email: [email protected] http://www.fmhs.auckland.ac.nz/sms/pharmacology/holford