[petsc-users] Large Matrix eigenvalue problem : configuration

[venkatesh g]

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
?
Is the unknowns being considered as the entire eigenspace 57000x57000 ?

kindly let me know.

Venkatesh
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