[Gretl-devel] Re: "set plot_collection" doc

On Tue, 17 Aug 2021, Sven Schreiber wrote: > Am 17.08.2021 um 12:07 schrieb Riccardo (Jack) Lucchetti:

> I have just also added the notes to the funcerr and errorif() docs that > in MPI mode execution will not be stopped. To be precise, I added this > sentence: "An exception is the special MPI mode for parallelized program > execution, where only the associated string is printed." > > Not sure whether gretl's actual behavior already matches this intention, > though, but I guess it's coming soon. It's more complicated than I thought. I don't think we should make any changes to the code until we've thought through the whole thing carefully. As things stand the user is probably not going to see a string set by funcerr or errorif under MPI. That could be arranged, but at a cost in terms of relaying MPI output in real time (as when a time-consuming MPI block is run in the GUI program). There's a trade-off here. Sorry, I don't have time to explain this properly right now but we can get to it after releasing 2021c. For now it might be better to be even less committal in the doc, just saying that funcerr/errorif are unlikely to work as expected under MPI. ("Unlikely" because it depends on the exact context: running via the gretl GUI, or gretlcli, or gretlmpi.)