memory reporting question

[Matthew Knepley]

On Thu, Sep 17, 2009 at 6:04 PM, Matt Funk <mafunk at nmsu.edu> wrote:

> Hi,
>
>
> I am wondering whether the -memory_info option and the
> PetscMemoryGetMaximumUsage<http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Sys/PetscMemoryGetMaximumUsage.html#PetscMemoryGetMaximumUsage>()
> call report different things.
>
>
> The reason i am asking is because i call the PetscMemoryGetCurrentUsage fcn
> in my code and it shows:
> 5.25558e+08.
>

This call get_rusage(), so it gives you the entire process size.


> At the end of the run the -memory_info option reports:
> max process malloc()'ed: 4.00524e+08
>

This is a sampling of rusage every time an object is destroyed.


> max petsc malloc()'ed: 1.15254e+08.
>

This is all the memory malloced using PetscMalloc() summed.

  Matt


> So i am a little confused by those numbers unless the fcn call is the more
> complete picture (as said on the manual page)
>
>
> I guess then my question is whether the -memory_info corresponds to the
> PetscMalloc* fcns?
>
>
> thanks
> matt
>



-- 
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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