Thanks Matt and Barry. Clear. Ed
On Fri, Sep 11, 2020 at 2:05 PM Barry Smith <[email protected]> wrote: > > > On Sep 11, 2020, at 2:58 PM, Matthew Knepley <[email protected]> wrote: > > On Fri, Sep 11, 2020 at 3:57 PM Ed Bueler <[email protected]> wrote: > >> Dear PETSc -- >> >> I notice in the users manual that the C examples show >> >> ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; >> >> at the start of main() and >> >> ierr = PetscFinalize(); >> return ierr; >> >> at the end of main(). Is this the deliberate, recommended style? >> > > Yes. > > >> My understanding of these choices is that if PetscInitialize() fails >> then CHKERRQ(ierr) may not do the right thing, >> > > Yes, failure early-on in Initialize() can predate setting up error > handling. > > >> while if PetscFinalize() fails then that should be the result of main() >> (without any fiddling by CHKERRQ etc.). Is this the correct understanding? >> > > Yes. > > > If there is a failure in PetscFinalize() then PETSc will be in some > unknown state where the CHKERRQ macros will no longer work so PETSc error > handling should not be called. > > Barry > > > Thanks, > > Matt > > >> Thanks, >> >> Ed >> >> -- >> Ed Bueler >> Dept of Mathematics and Statistics >> University of Alaska Fairbanks >> Fairbanks, AK 99775-6660 >> 306C Chapman >> > > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > > https://www.cse.buffalo.edu/~knepley/ > <http://www.cse.buffalo.edu/~knepley/> > > > -- Ed Bueler Dept of Mathematics and Statistics University of Alaska Fairbanks Fairbanks, AK 99775-6660 306C Chapman
