[petsc-users] the size of matrix in PETSc solver

[Matthew Knepley]

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.

  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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