On May 1, 2012, at 7:22 PM, Dave Nystrom wrote:

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2. Is anyone on this list sufficiently familiar with agmg and the other PETSc mg solvers to know how to configure the PETSc mg solvers to work more like agmg? It seems that agmg gives better performance than the PETSc mg solvers but I also have issues with agmg including fragility.

Please send a link for information on agmg; I've never heard of that.

http://homepages.ulb.ac.be/~ynotay/AGMG

Ok, this general approach is what the Trilinos ML solver users (which is a fairly good) and what Mark Adams is adding to PETSc in PCGAMG. You can start by ./configure PETSc with --download-ml and then run the program with -pc_type mg You can run with -ksp_view to see the number of levels etc it ended up with and http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCML.html for some options. Barry

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Barry

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Thanks,

Dave