[petsc-users] Bad memory scaling with PETSc 3.10

[Mark Adams]

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 <
petsc-users at mcs.anl.gov> 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.              #
>               #                                                        #
>               ##########################################################
>
>
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