[petsc-users] Large Matrix eigenvalue problem : configuration

[Matthew Knepley]

On Sat, May 16, 2015 at 3:49 AM, venkatesh g <venkateshgk.j at gmail.com>
wrote:

> Hi,
>
> I am trying to solving AX=lambda BX
>
> A and B are of size 57000 x 57000
>
> Currently I solve my small matrices using -st_type sinvert and -eps_nev 1
>
> So I get 1 eigenvalue and eigenvector.
>
> So for the 57000x57000 large matrix problem, the unknown eigenvector is
> 57000x1
>
> Should I configure the petsc as '--with-64-bit-indices=1' for this problem
> ?
>

It is not necessary.

   Matt


> Is the unknowns being considered as the entire eigenspace 57000x57000 ?
>
> kindly let me know.
>
> Venkatesh
>



-- 
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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