Hi there I upgraded my server computer and I also upgraded mpich program from mpich1(1.2.7p1) to mpich2(1.4.1). And then there were some problems… The problem was There is no error when I run mpich2(mpiexec) with output file which compiled at mpich1. But there is an error when I run mpich2(mpiexec) with output file which compiled at mpich2 (there was no error when I compiled at mpich2). (All compiling which mentioned above use same code) The error message was ============================================================================ ========= = BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES = EXIT CODE: 11 = CLEANING UP REMAINING PROCESSES = YOU CAN IGNORE THE BELOW CLEANUP MESSAGES ============================================================================ ========= [proxy:0:1@n002] HYD_pmcd_pmip_control_cmd_cb (/home/octofous2/libraries/mpich2- 1.4.1p1/src/pm/hydra/pm/pmiserv/pmip_cb.c:928): assert (!closed) failed [proxy:0:1@n002] HYDT_dmxu_poll_wait_for_event (/home/octofous2/libraries/mpich2- 1.4.1p1/src/pm/hydra/tools/demux/demux_poll.c:77): callback returned error status [proxy:0:1@n002] main (/home/octofous2/libraries/mpich2- 1.4.1p1/src/pm/hydra/pm/pmiserv/pmip.c:276): demux engine error waiting for event [[email protected]] HYDT_bscu_wait_for_completion (/home/octofous2/libraries/mpich2- 1.4.1p1/src/pm/hydra/tools/bootstrap/utils/bscu_wait.c:70): one of the processes terminated badly; aborting [[email protected]] HYDT_bsci_wait_for_completion (/home/octofous2/libraries/mpich2- 1.4.1p1/src/pm/hydra/tools/bootstrap/src/bsci_wait.c:23): launcher returned error waiting for completion [[email protected]] HYD_pmci_wait_for_completion (/home/octofous2/libraries/mpich2- 1.4.1p1/src/pm/hydra/pm/pmiserv/pmiserv_pmci.c:191): launcher returned error waiting for completion [[email protected]] main (/home/octofous2/libraries/mpich2- 1.4.1p1/src/pm/hydra/ui/mpich/mpiexec.c:405): process manager error waiting for completion 8 cpus So.. my quastion was that is there any language change between mpich1(1.2.7p1) and mpich2(1.4.1) which makes problem like this? Or there is any clue to make this problem..? Thanks for read Best regards