Hello, I am running a numerical dispersion model on a linux cluster with mvapich-1.2.0 and pgi/10.2 compiler. I am trying to submit a job on 8 processors with code written by the developer but I keep getting errors. Right now I am getting the following error when the executable hycm_std gets called: /share/huina/akp4221/hysplit/trunk/exec/hycm_std PMGR_COLLECTIVE ERROR: unitialized MPI task: Missing required environment variable: MPIRUN_RANK I do not have root privileges but I would like to know what the potential issues I could be facing so I can let the administrator now. -- Andre Pattantyus Graduate Student Research Assistant Department of Meteorology University of Hawaii at Manoa 2525 Correa Rd, HIG 350 Honolulu, HI 96822 Phone: (845) 264-3582