Is your matrix updating at every time step or just the right hand side
vector?
If its just the right hand side vector is changing, the development version
of dealii has the ability to factorize the matrix once
and then just do solve(x,b) at every time step. I'm not sure, but it Might
help.
On Monday, January 30, 2017 at 9:41:47 PM UTC-5, femFluid wrote:
>
> hi, dear all,
>
> i am using trilino's direct solver interface to solve a time-dependent
> problem. I realized that
> when the number of iterations increases, the memory usage also increases.
> This increase
> does not arise when turning the solver off, so just assembling the
> matrices.
>
> At the beginning, i used the following subroutine at every time step,
>
> {
> deallog.push("DirectKLU");
> TrilinosWrappers::SolverDirect::AdditionalData data;
> data.solver_type = "Amesos_Klu";
> SolverControl solver_control (1000, 1e-10);
> TrilinosWrappers::SolverDirect solver(solver_control, data);
> solver.solve (matrix, solution, rhs);
> thick_constraints.distribute (thick_solution);
> }
>
> then i realized that the memory might be allocated every time when
> defining TrilinosWrappers::SolverDirect solver(.....), which is not
> released.
> Then I predefine the solver in a namespace, which is the used by calling
> solver.solve (matrix, solution, rhs) at each step. Still, the memory
> leakage
> occurs.
>
> I also tried to use "Amesos_Mumps", the problem still exists. I tried to
> see the documentation of Amesos, i realized that when amesos solver
> finished solving, there is a procedure 'delete solver' after. May I ask
> whether
> such a member function exists in dealII wrappers? Thanks in advance,
>
> best,
> lailai
>
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