[petsc-users] Is it possible to free extra memory after mat assemble?

[Matthew Knepley]

2011/2/18 Gong Ding <gdiso at ustc.edu>

> Hi,
> After update my FVM code to support higher order, I have to preallocate
> more memory when creating the matrix. However, only a few cells (determined
> at run time) needed to be high order, thus preallocated memory is overkill
> too much.
>
> Is it possible to add a function to reassemble the AIJ matrix to free the
> extra memory?
> Or it has already done when MatAssembly is called?
>

This is done during MatAssemblyEnd(). However, there is no guarantee that
the operating system
actually returns that memory to general use.

   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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