[petsc-users] Enquiry regarding log summary results

[Matthew Knepley]

On Thu, Sep 27, 2012 at 3:49 AM, TAY wee-beng <zonexo at gmail.com> wrote:

> Hi,
>
> I'm doing a log summary for my 3d cfd code. I have some questions:
>
> 1. if I'm solving 3 linear equations using ksp, is the result given in the
> log summary the total of the 3 linear eqns' performance? How can I get the
> performance for each individual eqn?
>

Use logging stages:
http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Profiling/PetscLogStagePush.html


> 2. If I run my code for 10 time steps, does the log summary gives the
> total or avg performance/ratio?
>

Total.


> 3. Besides PETSc, I'm also using HYPRE's native geometric MG (Struct) to
> solve my Cartesian's grid CFD poisson eqn. Is there any way I can use
> PETSc's log summary to get HYPRE's performance? If I use boomerAMG thru
> PETSc, can I get its performance?


If you mean flops, only if you count them yourself and tell PETSc using
http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Profiling/PetscLogFlops.html

This is the disadvantage of using packages that do not properly monitor
things :)

    Matt


>
> --
> Yours sincerely,
>
> TAY wee-beng
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120927/90b2a193/attachment.html>