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11
votes
3answers
237 views
Problems where Conjugate gradient works much better than GMRES
I am interested in cases where Conjugate gradient works much better than GMRES method.
In general, CG is preferable choice in many cases of SPD (symmetric-positive-definite) because it requires less ...
3
votes
2answers
64 views
Parameter selection difficulty in GMRES
we are using a first order implicit finite volume code for simulation of incompressible flows. At its core, the code utilizes a (non-preconditioned) GMRES method for solving linear systems given in ...
1
vote
1answer
56 views
GMRES Matlab 'tol' parameter
I need to use GMRES solver in MATLAB, and I need to play around with the codes parameters and I had a very simple question about its usage.
The documentation of the solver here mentions a parameter ...
6
votes
4answers
148 views
Best choice of solver for a large sparse symmetric (but not positive definite) system
I am presently working on solving very large symmetric (but not positive definite) systems, generated by some certain algorithms. These matrices have a nice block sparsity which can be used for ...
2
votes
0answers
75 views
Cusp Library performance worse than PETSC (GMRES 200 iterations) Why?
I wanted to compare the speeds of the GMRES implementations in the CUSP and the PETSc libraries.
The matrix (A) used for testing was a 3d Laplacian matrix obtained by using the 7 point stencil on a ...
