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GMRES method .vs. bcg stab

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Old   August 10, 2008, 14:45
Default GMRES method .vs. bcg stab
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Dear friends:

I want to know , GMRES and BI_CG_STAB, which is more better. regards
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Old   August 12, 2008, 06:28
Default Re: GMRES method .vs. bcg stab
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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.
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