[petsc-users] gmg vs amg

[Barry Smith]

On Aug 4, 2012, at 10:56 PM, Amneet Bhalla <mail2amneet at gmail.com> wrote:

> Hi All,
> 
> Is it almost always the case that for structured mesh, geometric multigrid would be faster than algebraic multigrid solver/preconditioner?

   Not always, if it has highly varying anisotropic coefficients for example

> Basically I want to know If I had a choice between pfmg , gamg and boomeramg for structured grid what should I choose?

   I would try the algebraic multigrid since it is trivial to try and if that gives nice multigrid convergence, end of story, no need to spend time providing extra geometric information.


   Barry

> 
> Thanks, 
> 
> -- 
> Amneet 
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