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-   -   GMRES method .vs. bcg stab (http://www.cfd-online.com/Forums/main/15550-gmres-method-vs-bcg-stab.html)

ztdep August 10, 2008 15:45

GMRES method .vs. bcg stab
 
Dear friends:

I want to know , GMRES and BI_CG_STAB, which is more better. regards

Jed August 12, 2008 07:28

Re: GMRES method .vs. bcg stab
 
It depends on your equations, discretization, and preconditioner. You should try both (maybe (TF)QMR as well) with a selection of preconditioners. For most combinations from the following table, there is a matrix for which that combination is significantly better than the others. GMRES is pretty robust and makes a good default.

http://www-unix.mcs.anl.gov/petsc/pe...lvertable.html


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