Re: [petsc-users] Benchmarking

El 28 dic 2016, a las 17:14, Vijay Gopal Chilkuri <[email protected]> escribió:

Dear Jose,

Thanks for the references.

I'm only calculation the smallest 10-100 eigenvalues using the krylovshur algorithm.

How important is it to use a preconditioner ? My matrix has at most 48 nonzero elements per row.

With Krylov-Schur you don't need a preconditioner if computing smallest-real eigenvalues (which I think is your case). Preconditioners are relevant only for interior eigenvalues (chapter 3 of the users guide). Jose