[petsc-users] RAM usage by a sparse matrix

[Matthew Knepley]

On Thu, Aug 9, 2012 at 3:19 PM, Alexander Goncharov <alexvg77 at gmail.com>wrote:

> Hello PETSC developers!
>
> I would like to ask a couple of questions about symmetric sparse matrix
> storage
>
> 1. Is matrix frees unused preallocated nonzero space. For example, when
> run with option -info, it says how many nonzeros were unused. Is this
> unused space unallocated?
>

Yes, during assembly.


> 2. How PETSC stores symmetric sparse matrices on a GPU? Does it stores
> only half of it or not?
>

We do not have symmetric storage on the GPU since we only have what the
CUDA libraries have.

   Matt


> Thank you!
>
> Alexander.
>
>


-- 
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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