On Thu, Dec 29, 2011 at 19:30, Dave Nystrom <Dave.Nystrom at tachyonlogic.com>wrote:
> Generally I use CG and LU from petsc. Cholesky runs slower than LU and I > was > told in a previous email that it was because of the extra data movement for > Cholesky versus LU. I have also tried minres instead of CG and tend to get > reduced iteration counts. But I think minres may have an extra dot product > and so is a little more expensive than cg. But minres is usually cheaper > over all because of the reduction in iterations. > If you are concerned about solve time for serial runs, I would either use Cholesky from MUMPS or CHOLMOD (install suitesparse, then -pc_type cholesky -pc_factor_mat_solver_type cholmod). -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20111229/f21585d1/attachment.html>
