[petsc-users] When is it better to use MUMPS?

[w_ang_temp]

Hello, Jed
    In my view, the intent of parallel computing is sovling large system. As you said, MUMPS is mainly used in
small problems. So are they contradictory. Or, is the "Small problems and moderate-size 2D problems" just relative,
compared with the large system?
    Thanks.
                                                              Jim







At 2012-10-30 23:47:59,"Jed Brown" <jedbrown at mcs.anl.gov> wrote:


Simple: it's better when it's faster. Small problems and moderate-size 2D problems often work well with direct solvers.

On Oct 30, 2012 8:29 AM, "w_ang_temp" <w_ang_temp at 163.com> wrote:

Hello,
    As is know, MUMPS is based on a direct method. When the system is big, the parallel direct solver is
not effective compared with the iterative solver. So when is it better to use MUMPS?
    Thanks.
                                         Jim





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