memory reporting question

[Satish Balay]

There is no destroy call between PetscMemoryGetCurrentUsage(),
PetscMemoryGetMaximumUsage - so MaxUsage isn't updated. Perhaps it
should be updated in PetscMemoryGetCurrentUsage() call aswell?

Satish


On Fri, 18 Sep 2009, Matt Funk wrote:

> Ok,
> 
> i am more confused now.
> The following is part of my code:
> 
>   PetscLogDouble mem;
>   PetscMemoryGetCurrentUsage(&mem);
>   cout<<"PetscMemoryGetCurrentUsage: "<<mem<<"\n"; cout.flush();
>   PetscMemoryGetMaximumUsage(&mem);
>   cout<<"PetscMemoryGetMaximumUsage: "<<mem<<"\n"; cout.flush();
> 
> 
> This is what is reported:
> 
> PetscMemoryGetCurrentUsage: 5.25525e+08
> PetscMemoryGetMaximumUsage: 3.09055e+08
> 
> 
> Now, unless i am missing something obvious, i am completely confused how it is 
> that the maximum usage can be less than the current usage.
> 
> What am i missing here?
> 
> 
> thanks
> matt
> 
> 
> 
> 
> On Thursday 17 September 2009, you wrote:
> > 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/snapshot
> > >s/petsc-current/docs/manualpages/Sys/PetscMemoryGetMaximumUsage.html#Petsc
> > >MemoryGetMaximumUsage>() 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
> 
> 
>