[petsc-users] the size of matrix in PETSc solver
Barry Smith
bsmith at mcs.anl.gov
Fri Dec 31 12:39:28 CST 2010
On Dec 31, 2010, at 12:28 PM, Matthew Knepley wrote:
> On Fri, Dec 31, 2010 at 12:23 PM, Peter Wang <pengxwang at hotmail.com> wrote:
> I am trying to build a big matrix to be solved by KSP. I am wondering is there any limitation to the matrix size? What is the maximum size of the matrix in KSP? For example, if a 100 M by 100 M matrix can be handled by the KSP? Thanks a lot.
>
> There are two limitations:
>
> a) Machine memory. To combat this, we recommend running in parallel
>
> b) Representation of row/col numbers by integers. If you have > 2B rows, you will need to reconfigure
> using --with-64-bit-ints.
--with-64-bit-indices
>
> 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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