dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, Jul 07, 2009 at 09:07:13PM +0100, Garth N. Wells wrote:
> 
> 
> Johan Hake wrote:
> > On Tuesday 07 July 2009 19:18:22 Garth N. Wells wrote:
> >> Kristian Oelgaard wrote:
> >>> Hi,
> >>>
> >>> I get:
> >>>
> >>> Solving linear variational problem
> >>>   Matrix of size 1089 x 1089 has 7361 nonzero entries.
> >>>   Applying boundary conditions to linear system.
> >>>   *** Warning: Ignoring unknown parameter "absolute_tolerance" in
> >>> parameter set "krylov_solver" when updating parameter set "parameters".
> >>>   *** Warning: Ignoring unknown parameter "divergence_limit" in parameter
> >>> set "krylov_solver" when updating parameter set "parameters".
> >>>   *** Warning: Ignoring unknown parameter "gmres_restart" in parameter
> >>> set "krylov_solver" when updating parameter set "parameters".
> >>>   *** Warning: Ignoring unknown parameter "maximum_iterations" in
> >>> parameter set "krylov_solver" when updating parameter set "parameters".
> >>>   *** Warning: Ignoring unknown parameter "monitor_convergence" in
> >>> parameter set "krylov_solver" when updating parameter set "parameters".
> >>>   *** Warning: Ignoring unknown parameter "relative_tolerance" in
> >>> parameter set "krylov_solver" when updating parameter set "parameters".
> >>>   *** Warning: Ignoring unknown parameter "report" in parameter set
> >>> "krylov_solver" when updating parameter set "parameters".
> >>>   *** Warning: Ignoring unknown parameter "shift_nonzero" in parameter
> >>> set "krylov_solver" when updating parameter set "parameters".
> >>> terminate called after throwing an instance of 'std::runtime_error'
> >>>   what():  *** Error: Unable to access parameter "report" in parameter
> >>> set "parameters", parameter not defined.
> >>> [mech028:15991] *** Process received signal ***
> >>> [mech028:15991] Signal: Aborted (6)
> >>> [mech028:15991] Signal code:  (-6)
> >>> [mech028:15991] [ 0] [0xb805d410]
> >>> [mech028:15991] [ 1] /lib/tls/i686/cmov/libc.so.6(abort+0x188)
> >>> [0xb6154098] [mech028:15991] [ 2]
> >>> /usr/lib/libstdc++.so.6(_ZN9__gnu_cxx27__verbose_terminate_handlerEv+0x15
> >>> 8) [0xb636e8f8]
> >>> [mech028:15991] [ 3] /usr/lib/libstdc++.so.6 [0xb636c7d5]
> >>> [mech028:15991] [ 4] /usr/lib/libstdc++.so.6 [0xb636c812]
> >>> [mech028:15991] [ 5] /usr/lib/libstdc++.so.6 [0xb636c94a]
> >>> [mech028:15991] [ 6]
> >>> /home/oelgaard/fenics/dolfin/local/lib/libdolfin.so.0(_ZNK6dolfin6Logger5
> >>> errorESs+0x93) [0xb7f166a3]
> >>> [mech028:15991] [ 7]
> >>> /home/oelgaard/fenics/dolfin/local/lib/libdolfin.so.0(_ZN6dolfin5errorESs
> >>> z+0x9f) [0xb7f1f62f]
> >>> [mech028:15991] [ 8]
> >>> /home/oelgaard/fenics/dolfin/local/lib/libdolfin.so.0(_ZN6dolfin10Paramet
> >>> ersclESs+0xb3) [0xb7fc7833]
> >>> [mech028:15991] [ 9]
> >>> /home/oelgaard/fenics/dolfin/local/lib/libdolfin.so.0(_ZN6dolfin17PETScKr
> >>> ylovSolver5solveERKNS_11PETScMatrixERNS_11PETScVectorERKS4_+0xb2)
> >>> [0xb7ee9ce2]
> >>> [mech028:15991] [10]
> >>> /home/oelgaard/fenics/dolfin/local/lib/libdolfin.so.0(_ZN6dolfin17PETScKr
> >>> ylovSolver5solveERKNS_13GenericMatrixERNS_13GenericVectorERKS4_+0xfb)
> >>> [0xb7eea3db]
> >>> [mech028:15991] [11]
> >>> /home/oelgaard/fenics/dolfin/local/lib/libdolfin.so.0(_ZN6dolfin12KrylovS
> >>> olver5solveERKNS_13GenericMatrixERNS_13GenericVectorERKS4_+0x18e)
> >>> [0xb7e69c1e]
> >>> [mech028:15991] [12]
> >>> /home/oelgaard/fenics/dolfin/local/lib/libdolfin.so.0(_ZN6dolfin18Variati
> >>> onalProblem12solve_linearERNS_8FunctionE+0xaaf) [0xb7e674af]
> >>> [mech028:15991] [13]
> >>> /home/oelgaard/fenics/dolfin/local/lib/libdolfin.so.0(_ZN6dolfin18Variati
> >>> onalProblem5solveERNS_8FunctionE+0x2a) [0xb7e6814a]
> >>> [mech028:15991] [14] ./demo(main+0x497) [0x805db07]
> >>> [mech028:15991] [15] /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5)
> >>> [0xb613d775]
> >>> [mech028:15991] [16] ./demo [0x805d541]
> >>> [mech028:15991] *** End of error message ***
> >>>
> >>> if I do:
> >>>
> >>>   problem.parameters("linear_solver") = "iterative";
> >>>
> >>> in the Poisson demo.
> >>>
> >>> Is this a bug, or am I using the new parameter system incorrectly?
> >> Take a look at the change Johan made recently to LUSolver. Same thing
> >> probably needs to be done for KrylovSolver.
> > 
> > This one beats me... It is another problem here. 
> > 
> 
> I've added a function to set parameters for PETScKrylovSolver and 
> everything works now.
> 
> > KrylovSolver::parameters get initialized. However, it looks like 
> > 
> >    solver.parameters.update(parameters["krylov_solver"]);
> > 
> > does not update the krylov solvers parameters, but rather an empty parameters, 
> > and therefore the warnings.
> > 
> 
> What exactly does (or should)
> 
>     solver.parameters.update(parameters["krylov_solver"]);
> 
> do?

It iterates over the parameters in parameters["krylov_solver"] and for
each of them sets the value for the parameter with the same name found
in solver.parameters. If a matching parameter is not found, a warning
is issued. So it's the same as the update() function does for a Python
dictionary but with the difference that a warning is issued when a
parameter is not found (rather than just creating it).

-- 
Anders

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