2 Dec
2016
2 Dec
'16
4:11 p.m.
On 2 Dec 2016, at 16:01, Anna Kalogirou <a.kalogirou@leeds.ac.uk> wrote:
Linear firedrake_0_fieldsplit_3_ solve did not converge due to DIVERGED_DTOL iterations 35
The option
"fieldsplit_3_pc_factor_shift_type": "nonzero"
Given that LU with pivoting ought to invert the block unless it is singular, I think something funky is going on. Can you additionally run with: "fieldsplit_3_ksp_monitor_true_residual": True (In passing, if you're using LU you should probably be setting the ksp_type of these sub solves to "preonly", so you don't bother iterating). Lawrence