[petsc-users] Bad memory scaling with PETSc 3.10

[Myriam Peyrounette]

Hi,

good point, I changed the 3.10 version so that it is configured with
--with-debugging=0. You'll find attached the output of the new LogView.
The execution time is reduced (although still not as good as 3.6) but I
can't see any improvement with regard to memory.

You'll also find attached the grep GAMG on -info outputs for both
versions. There are slight differences in grid dimensions or nnz values,
but is it significant?

Thanks,

Myriam



Le 03/08/19 à 23:23, Mark Adams a écrit :
> 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 <mailto: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.         
>         #
>                   #                                                   
>         #
>                  
>     ##########################################################
>

-- 
Myriam Peyrounette
CNRS/IDRIS - HLST
--
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