Let's try another experiment. Edit run_pnetcdf_test.sh and change mpiexec -n 4 ./tst_parallel2 to mpiexec -n 2 ./tst_parallel2 and see if it still fails. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: MRB-844393 Department: Support netCDF Priority: Normal Status: Closed