John Peterson <jwpeter...@gmail.com> writes: > On Thu, May 2, 2019 at 12:35 PM Yuxiang Wang <yw...@virginia.edu> wrote: > >> Dear all, >> >> A quick question - when using libmesh, should I consciously do bandwidth >> minimization when I number my node IDs? Or, are those taken care of at >> pre-processing stage of PETSc and other solvers? >> > > I wouldn't try and do anything manually since PETSc has a number of > renumbering algorithms that I think you can play around with pretty easily > to see if they make any difference...
You can run factorizations in a different ordering, but low-bandwidth orderings make a difference for cache reuse in MatMult. PETSc can't reorder that without making a copy. But don't put too much effort into it. _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
