Hi Hong: There is no explicit error message actually. The solver converge in 0 iteration and returns an nan number. Looks like a zero pivoting problem.
Mike On Fri, Oct 5, 2018 at 6:12 PM Zhang, Hong <[email protected]> wrote: > Mike: > >> Hello PETSc team: >> >> I am trying to solve a PDE problem with high-order finite elements. The >> matrix is getting denser and my experience is that MUMPS just outperforms >> iterative solvers. >> >> For certain problems, MUMPS just fail in the middle for no clear reason. >> I just wander if there is any suggestion to improve the robustness of >> MUMPS? Or in general, any suggestion for interative solver with very >> high-order finite elements? >> > > What error message do you get when MUMPS fails? Out of memory, zero > pivoting, or something? > Hong >
