[petsc-users] How to choose a suitable restarted m when using GMRES?

[w_ang_temp]

Hello,
    As is know, GMRES(m) is a very efficient solver when dealing with symmetric indefinite
system. And the restarted parameter m is critical. When the system is small, I can do
several tests to find a suitable m. But when the system is very large, it is very difficult
to do that. I read lots of papers about GMRES(m) and find that almost none told the way to
get a suitable m. Someone told me that I can just choose the matrix dimension as the m, but
I find that it is not right.
    So, generally, when using GMRES(m) as the sovler, how to use a suitable restarted m?
    Thanks.
                                                               Jim
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