[petsc-dev] Question About Petsc ILU

[Dave Nystrom]

Jed Brown writes:
 > 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).

I just browsed through the output of configure -help and don't see
suitesparse.  I do see stuff for cholmod but not a download option for
cholmod.