Hi Hong,
I just checked using ex10 for these matrices and rhs, they all work
fine. I found something is wrong in my code when using direct solver.
The second parameter mat in PCFactorGetMatrix(PC pc,Mat *mat) is not
initialized in my code for SUPERLU or MUMPS.
I will fix this bug, rerun the tests and get back to you later.
Thanks very much,
Danyang
On 15-12-03 01:59 PM, Hong wrote:
Danyang :
Further testing a_flow_check_168.bin,
./ex10 -f0
/Users/Hong/Downloads/matrix_and_rhs_bin/a_flow_check_168.bin -rhs
/Users/Hong/Downloads/matrix_and_rhs_bin/x_flow_check_168.bin -pc_type
lu -pc_factor_mat_solver_package superlu -ksp_monitor_true_residual
-mat_superlu_conditionnumber
Recip. condition number = 1.610480e-12
0 KSP preconditioned resid norm 6.873340313547e+09 true resid norm
7.295020990196e+03 ||r(i)||/||b|| 1.000000000000e+00
1 KSP preconditioned resid norm 2.051833296449e-02 true resid norm
2.976859070118e-02 ||r(i)||/||b|| 4.080672384793e-06
Number of iterations = 1
Residual norm 0.0297686
condition number of this matrix = 1/1.610480e-12 = 1.e+12,
i.e., this matrix is ill-conditioned.
Hong
Hi Hong,
The binary format of matrix, rhs and solution can be downloaded
via the link below.
https://www.dropbox.com/s/cl3gfi0s0kjlktf/matrix_and_rhs_bin.tar.gz?dl=0
Thanks,
Danyang
On 15-12-03 10:50 AM, Hong wrote:
Danyang:
To my surprising, solutions from SuperLU at timestep 29 seems
not correct for the first 4 Newton iterations, but the
solutions from iteration solver and MUMPS are correct.
Please find all the matrices, rhs and solutions at timestep
29 via the link below. The data is a bit large so that I just
share it through Dropbox. A piece of matlab code to read
these data and then computer the norm has also been attached.
_https://www.dropbox.com/s/rr8ueysgflmxs7h/results-check.tar.gz?dl=0_
Can you send us matrix in petsc binary format?
e.g., call MatView(M, PETSC_VIEWER_BINARY_(PETSC_COMM_WORLD))
or '-ksp_view_mat binary'
Hong
Below is a summary of the norm from the three solvers at
timestep 29, newton iteration 1 to 5.
Timestep 29
Norm of residual seq 1.661321e-09, superlu 1.657103e+04,
mumps 3.731225e-11
Norm of residual seq 1.753079e-09, superlu 6.675467e+02,
mumps 1.509919e-13
Norm of residual seq 4.914971e-10, superlu 1.236362e-01,
mumps 2.139303e-17
Norm of residual seq 3.532769e-10, superlu 1.304670e-04,
mumps 5.387000e-20
Norm of residual seq 3.885629e-10, superlu 2.754876e-07,
mumps 4.108675e-21
Would anybody please check if SuperLU can solve these
matrices? Another possibility is that something is wrong in
my own code. But so far, I cannot find any problem in my code
since the same code works fine if I using iterative solver or
direct solver MUMPS. But for other cases I have tested, all
these solvers work fine.
Please let me know if I did not write down the problem clearly.
Thanks,
Danyang
