OK, I see. I will do it, thank you! I will let you know if I get any result.
On Mon, Aug 17, 2020 at 7:06 PM Wolfgang Bangerth
wrote:
> On 8/17/20 6:01 PM, yuesu jin wrote:
> > I did nothing to verify those properties. because the single thread
> CG
> > solver converged well. I used differ
On 8/17/20 6:01 PM, yuesu jin wrote:
I did nothing to verify those properties. because the single thread CG
solver converged well. I used different preconditioners in parallel version
and single thread version. In the parallel version I used block Jacobi and in
the single thread version I
Dear Dr.Bangerth,
I did nothing to verify those properties. because the single thread CG
solver converged well. I used different preconditioners in parallel
version and single thread version. In the parallel version I used block
Jacobi and in the single thread version I used Jacobi. How can I
I tried both, first I tried 1e-4*system_rhs.l2_norm(), it failed.
Then either the matrix is not symmetric/positive definite/whatever other
property your iterative solver requires, or your preconditioner is unsuitable.
What have you don to verify that your matrix has the necessary proper
Dear Dr.Bangerth,
I tried both, first I tried 1e-4*system_rhs.l2_norm(), it failed. Then I
tried with exact precision limits, from 1e-3 to 1e-8, all of them cannot
converge. If I set the precision level as 1e-4, with or without L2 norm it
stopped at step-42 with the residue 0.0113395.
Best rega
On 8/14/20 9:20 PM, yuesu jin wrote:
I tried a few levels of the tolerance, 1e-3, 1e-4 ,1e-6 and 1e-8. 1e-3
converged because that is in the same level with the solution. Error occurs
below 1e-4. I have tried the Jacobi preconditioner instead of SSOR in the
single thread CG version, it converg
Dear Dr. Bangerth,
I tried a few levels of the tolerance, 1e-3, 1e-4 ,1e-6 and 1e-8. 1e-3
converged because that is in the same level with the solution. Error occurs
below 1e-4. I have tried the Jacobi preconditioner instead of SSOR in the
single thread CG version, it converged as well.
Best reg
On 8/14/20 5:53 PM, yuesu jin wrote:
I also wrote a single thread CG version, which converges well. The
preconditioner in the parallel version is blockJacobi but the single thread
version I used is SSOR. Does it matter to the convergence? Thank you!
Yes, in exactly the ways the error message
