You need --download-superlu due to licensing restrictions. And you need the development version.
Matt On Feb 18, 2014 11:25 AM, "Qin Lu" <[email protected]> wrote: > Do you mean using "-pc_factor_mat_ordering_type wbm"? It does not seem > to be in the manual. What exactly is it? I will try it anyway. > > Many thanks, > Qin > > > On Tuesday, February 18, 2014 10:11 AM, Jed Brown <[email protected]> > wrote: > Qin Lu <[email protected]> writes: > > > > RCM did not help much for my case. This case represents some strong > > connectivities in channels. I am wondering if PETSc has some > > reordering algorithm or solver that is not based on connectivity > > graph, but is based on connectivity strength (such as percolation type > > of reordering). Any information is appreciated. Thanks, Qin > > > There isn't such an ordering, but it would be a welcome contribution. > One challenge is that features like anisotropy are not necessarily > apparent in the matrix entries. In that case, and for vector-valued > problems, you would ideally use a better strength-of-connection measure. > If you computed a strength-of-connection, then thresholded (or used edge > weights as a "priority"), followed by something like an RCM ordering, > you could find something good for low-fill incomplete factorization in > problems with hidden anisotropy. > >
