Dear Lailai,
Internally we store the Amesos solver in a smart pointer
<https://github.com/dealii/dealii/blob/master/include/deal.II/lac/trilinos_solver.h#L737>,
so when the solver goes out of scope the solver is destroyed. At this time,
the Amesos solver should clean up after itself - in its class documentation
<https://trilinos.org/docs/dev/packages/amesos/doc/html/classAmesos__BaseSolver.html>
I can find no mention of a "delete" or "destroy" function. So I don't think
its likely that this is causing a memory leak, but if you're able to
produce a minimal test case then we could investigate further. I suppose I
should ask, which version of Trilinos are you using?
Regards,
Jean-Paul
On Tuesday, January 31, 2017 at 3:41:47 AM UTC+1, 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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