GMRES method .vs. bcg stab

August 10, 2008, 15:45

Dear friends:

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

August 12, 2008, 07:28

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

August 10, 2008, 15:45	GMRES method .vs. bcg stab	#1
ztdep Guest Posts: n/a	Dear friends: I want to know , GMRES and BI_CG_STAB, which is more better. regards

August 12, 2008, 07:28	Re: GMRES method .vs. bcg stab	#2
Jed Guest Posts: n/a	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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