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.
