Since
KSP Object: (flow_sub_) 1 MPI processes
type: preonly
this means only a single iteration of the inner solver is used so the numbers
in red are not used.
You could do something like -flow_ksp_type fgmres -flow_sub_ksp_type gmres
-flow_sub_ksp_rtol 1.e-2 but it wouldn't help maters. Likely the current values
are the best.
Barry
> On Oct 4, 2018, at 5:44 PM, HeeHo Park <[email protected]> wrote:
>
> Hi, I'm running PFLOTRAN and in PFLOTRAN, we have flow_ and flow_sub_
> processes. I was wondering what the red underlined values meant (each block
> tolerance?) and how to change them (would it affect convergence?). Blue
> marked bold values are changed from the default values for linear solvers.
>
> FLOW Linear Solver
> solver: bcgs
> preconditioner: asm
> atol: 1.000000E-10
> rtol: 1.000000E-10
> dtol: 1.000000E+04
> maximum iteration: 10000
> KSP Object: (flow_) 8 MPI processes
> type: bcgs
> maximum iterations=10000, initial guess is zero
> tolerances: relative=1e-10, absolute=1e-10, divergence=10000.
> left preconditioning
> using PRECONDITIONED norm type for convergence test
> PC Object: (flow_) 8 MPI processes
> type: asm
> Additive Schwarz: total subdomain blocks = 8, amount of overlap = 1
> Additive Schwarz: restriction/interpolation type - RESTRICT
> [0] number of local blocks = 1
> [1] number of local blocks = 1
> [2] number of local blocks = 1
> [3] number of local blocks = 1
> [4] number of local blocks = 1
> [5] number of local blocks = 1
> [6] number of local blocks = 1
> [7] number of local blocks = 1
> Local solve info for each block is in the following KSP and PC objects:
> - - - - - - - - - - - - - - - - - -
> [0] local block number 0, size = 1389
> KSP Object: (flow_sub_) 1 MPI processes
> type: preonly
> maximum iterations=10000, initial guess is zero
> >>> tolerances: relative=1e-05, absolute=1e-50, divergence=10000.
> left preconditioning
> using DEFAULT norm type for convergence test
> PC Object: (flow_sub_) 1 MPI processes
> type: ilu
> PC has not been set up so information may be incomplete
> out-of-place factorization
> 0 levels of fill
> tolerance for zero pivot 2.22045e-14
> using diagonal shift on blocks to prevent zero pivot [INBLOCKS]
> matrix ordering: natural
> linear system matrix = precond matrix:
> Mat Object: (flow_) 1 MPI processes
> type: seqbaij
> rows=1389, cols=1389, bs=3
> total: nonzeros=20025, allocated nonzeros=20025
> total number of mallocs used during MatSetValues calls =0
> block size is 3
> - - - - - - - - - - - - - - - - - -
>
> --
> HeeHo Daniel Park
