[petsc-users] Enquiry regarding log summary results

[TAY wee-beng]

On 27/9/2012 1:44 PM, Matthew Knepley wrote:
> On Thu, Sep 27, 2012 at 3:49 AM, TAY wee-beng <zonexo at gmail.com 
> <mailto: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

I tried to follow the steps from the manual for my Fortan code using:

/call PetscInitialize(PETSC_NULL_CHARACTER,ierr)//
//
//... 1st stage - solving momentum eqn//- run 1st logging
//
//call PetscLogStagePush(1,ierr)//
//
//... 2nd stag - solve poisson eqn//- run 2nd logging
//
//call PetscLogStagePop//(ierr)//
//
//...//
//
//call PetscFinalize(ierr)/

but then I got the error:

  Argument out of range!
[33]PETSC ERROR: Invalid stage 1 should be in [0,1)!

...

How should I use the syntax to allow 2 stages logging?

Tks!

>     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

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