[petsc-dev] general aggregates in ASM, from GAMG aggregates, and overlap problem

Barry Smith bsmith at mcs.anl.gov
Fri Sep 16 15:33:11 CDT 2016

   He's should submit a full bug report to petsc-maint at mcs.anl.gov. 


> On Sep 16, 2016, at 2:48 PM, Mark Adams <mfadams at lbl.gov> wrote:
> Garth is getting a segv when he uses -pc_gamg_asm_use_agg and an overlap of 1.
> This seems like a pretty hard thing to do right and I would not be surprised if it was not done with complete generality. MatGetSubMatrix is find to get any submatrix but enlarging a remote subdomain seems very tricky.
> Should I perhaps check for overlap in GAMG and give an error? Maybe it would be better to have ASM do this.  Maybe I could make ASM have a flag am-i-nested and not allow overlap if not?
> Mark

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