[Trilinos-Users] aztecoo+sundance problem
Gideon Simpson
grs2103 at columbia.edu
Wed Jan 17 18:52:06 MST 2007
I've been getting the following error when solving some problems that
come out of Sundance, using GMRES+DomainDecomposition+ILU
***************************************************************
Warning: a breakdown in this method
has occurred and solution has not converged.
Solver: gmres
number of iterations: 1
Recursive residual = nan
Calculated Norms Requested Norm
-------------------------------------------- --------------
||r||_2 / ||r0||_2: 1.000000e+00 1.000000e-12
***************************************************************
Solution time: 9.740000 (sec.)
total iterations: 1
Epetra ERROR -2, ../../../../packages/aztecoo/src/AztecOO.cpp, line 824
Solve failed! state = Crashed
message=Aztec solver failed: numerical breakdown
iters taken = 1
final residual = nan
matrix written to badMatrix.dat
RHS vector written to badVector.dat
The matrix and RHS data files look fine, and when I solve the problem
using an Amesos direct solver, the answer is consistent. What is the
nature of this error and how might I correct it?
-Gideon Simpson
Department of Applied Physics and Applied Mathematics
Columbia University
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