[petsc-users] degub of computating Jacobian for SNES

Hong hzhang at mcs.anl.gov
Tue Jul 3 09:30:40 CDT 2018

Run your code with option '-snes_converged_reason -ksp_converged_reason
-ksp_monitor -snes_monitor' to check which solver leads to divergence. Then
use option '-snes_view' to check what solver is used.

> Dear all
> I am using SNES for solving a large nonlinear system for Material Point
> Method. But it always diverged after server steps, I think there are some
> bug in the computation of Jacobian matrix. Do anyone have practical
> approach for identified these bugs in a large matrix? Currently, I saved
> the matrix to a txt file and load it to Matlab for checking. Is there
> function for checking Petsc Mat in Petsc itself?
> Cheers
> Lei
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