Just seeing this now. It is hard to imagine how bad GAMG could be on a coarse grid, but you can run with -info and grep on GAMG and send that. You will see listing of levels, number of equations and number of non-zeros (nnz). You can send that and I can get some sense of GAMG is going nuts.
Mark On Fri, Mar 8, 2019 at 11:56 AM Jed Brown via petsc-users < [email protected]> wrote: > It may not address the memory issue, but can you build 3.10 with the > same options you used for 3.6? It is currently a debugging build: > > ########################################################## > # # > # WARNING!!! # > # # > # This code was compiled with a debugging option. # > # To get timing results run ./configure # > # using --with-debugging=no, the performance will # > # be generally two or three times faster. # > # # > ########################################################## > >
