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:
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[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
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--
HeeHo Daniel Park
