> On Jun 27, 2016, at 3:15 PM, Xiangdong <[email protected]> wrote: > > Hello everyone, > > I am trying different number of da_overlap to see its effects on nasm and > aspin preconditioner. The codes works fine with -da_overlap 0. However, when > I change the option -da_overlap 1, it crashed with the error message like > "zero pivot row 12544 value 0 tolerance 2.2e-14". The option > -pc_factor_nonzeros_along_diagonal does not fix this zero pivot issue. > > Do you have any quick suggestions for me to try to fix this issue?
My guess is that it is bug in the da_overlap business or in the example; normally I would not expect this to happen. Is this a PETSc example I can run (tell me example and exact options) to reproduce the problem? Thanks Barry > > Thank you. > > Best, > Xiangdong
