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Hi Joe, You definitely want to run gpend after every instance of gdgrib if the program itself is being launched multiple times, such as in a loop - each one will be assigned a separate process ID and that's what is filling up your system's semaphores. Give it a try with gpend called after each instance. If you still see problems send the script along so I can take a look. Best, Michael > > In our script, we're processing one GEMPAK file and extracting several > Grib messages, so there's a loop running gdgrib. Do I need to run gpend > after each iteration or just once at the end? > > Thanks. > > Joe > > Ticket Details =================== Ticket ID: ZXE-379509 Department: Support GEMPAK Priority: Normal Status: Open