On Mar 24, 2014, at 2:54 PM, Qiyue Lu <[email protected]> wrote: > Dear All: > > I am solving a series of matrix which are from the same FEA model but have > different number of meshes. In petsc, I use CR as the solver and > hypre-boomeramg as the preconditioner. It works for a small system with 2 > million DOFs. Also works for a system with 6 million DOFs. But always fail > with an error ' memory out of range' for a 10 or 20 million system. > > Additionally, with solver CR + preconditioner bjacobi, Petsc could solve 10 > and 20 million and even large systems easily. > > Also, with using top command in linux by monitoring the memory usage, I saw > some peaks in the memory. > > So, I am wondering, is this because the memory usage of boomeramg, that > larger systems always fail?
BoomerAMG does require a good amount more memory than “simpler” solvers. There is nothing one can do about it except use more MPI processes with more total memory for larger problems. Barry > > Thanks > > Qiyue Lu
