[Gretl-devel] Re: MPI data transfer

On Fri, 18 Oct 2019, Marcin Błażejowski wrote: >>> ALT_BUNSEND: 1, NEW_BUNCAST: 1 => crash >>> ALT_BUNSEND: 0, NEW_BUNCAST: 0 => works >> OK, but what about ALT_BUNSEND: 0, NEW_BUNCAST: 1 ? > > Crash. The problems exposed by Marcin's script are fixed in git -- which doesn't mean, of course, that there are no bugs remaining in the new MPI data transfer mechanism! For anyone wanting to mess with this: the new stuff is now controlled by a single symbol in gretl_mpi.c, namely NEW_BUNPASS. A value of 0 for this reverts to the old code; a value of 1 activates the new code for mpibcast only; and a value of 2 or greater activates the new code for both mpibcast and mpisend/mpirecv.