[petsc-users] RCM for ILU?

[Qin Lu]

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



On Friday, February 14, 2014 1:30 PM, Qin Lu <lu_qin_2000 at yahoo.com> wrote:
  
Thanks a lot!
 
Qin



On Friday, February 14, 2014 11:16 AM, Jed Brown <jed at jedbrown.org> wrote:
  
Qin Lu <lu_qin_2000 at yahoo.com> writes:


> Barry and
 Jed,
>  
> Nice to know that! Is there a corresponding function call to set RCM?

$ ./ex2 -pc_factor_mat_ordering_type rcm -help | grep -A1 mat_ordering
  -pc_factor_mat_ordering_type <natural>: Reordering to reduce nonzeros in factored matrix (one of) natural nd 1wd rcm qmd rowlength wbm spectral
      (PCFactorSetMatOrderingType)

Looks like you should check out

http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCFactorSetMatOrderingType.html
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