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? Thanks Qiyue Lu
