On Thu, 20 Jun 2019, Logan Kelly wrote: No, I'm pretty sure that won't work. "flush" is a GUI-specific thing, but inside an MPI block it's actually the command-line program gretlmpi that's doing the work. The output is collected and shown in a GUI window only when the gretlmpi instances have terminated. As things stand, I think you can view real-time MPI progress only by running gretlmpi yourself (in a terminal/console). Maybe we can figure out some clever means of grabbing and showing interim output but I suspect it won't be trivial. Allin