Chaste Commit::ca8ccdedf819b6e02855bc0e8e6f50bdecbc5208
SimplePetscNonlinearSolver.cpp
1/*
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34*/
35
40#include <sstream>
41#include "petscsnes.h"
42#include "SimplePetscNonlinearSolver.hpp"
43#include "Exception.hpp"
44#include "PetscTools.hpp"
45
46Vec SimplePetscNonlinearSolver::Solve(PetscErrorCode (*pComputeResidual)(SNES,Vec,Vec,void*),
47#if (PETSC_VERSION_MAJOR==3 && PETSC_VERSION_MINOR>=5)
48 PetscErrorCode (*pComputeJacobian)(SNES,Vec,Mat,Mat,void*),
49#else
50 PetscErrorCode (*pComputeJacobian)(SNES,Vec,Mat*,Mat*,MatStructure*,void*),
51#endif
52 Vec initialGuess,
53 unsigned fill,
54 void* pContext)
55{
56 SNES snes;
57
58 // Create the residual vector by copying the structure of the initial guess
59 Vec residual;
60 VecDuplicate(initialGuess, &residual);
61
62 Mat jacobian; // Jacobian Matrix
63 PetscInt N; // number of elements
64
65 // Get the size of the Jacobian from the residual
66 VecGetSize(initialGuess, &N);
67
68 // Note that the Jacobian matrix might involve new non-zero elements in the course of a SNES solve
69 PetscTools::SetupMat(jacobian, N, N, fill, PETSC_DECIDE, PETSC_DECIDE, true, false /*malloc flag*/);
70
71 SNESCreate(PETSC_COMM_WORLD, &snes);
72
73 SNESSetFunction(snes, residual, pComputeResidual, pContext);
74 SNESSetJacobian(snes, jacobian, jacobian, pComputeJacobian, pContext);
75
76#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 4) //PETSc 3.4 or later
77 SNESSetType(snes, SNESNEWTONLS);
78#else
79 SNESSetType(snes, SNESLS);
80#endif
81
82 SNESSetTolerances(snes,1.0e-5,1.0e-5,1.0e-5,PETSC_DEFAULT,PETSC_DEFAULT);
83#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR == 3) //PETSc 3.3
84 SNESLineSearch linesearch;
85 SNESGetSNESLineSearch(snes, &linesearch);
86 SNESLineSearchSetType(linesearch, "bt"); //Use backtracking search as default
87#elif (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 4) //PETSc 3.4 or later
88 SNESLineSearch linesearch;
89 SNESGetLineSearch(snes, &linesearch);
90 SNESLineSearchSetType(linesearch, "bt"); //Use backtracking search as default
91#endif
92
93 // x is the iteration vector SNES uses when solving, set equal to initialGuess to start with
94 Vec x;
95
96 VecDuplicate(initialGuess, &x);
97 VecCopy(initialGuess, x);
98
99#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 5)
100 // Seems to want the preconditioner to be explicitly set to none now
101 // Copied this from the similar PETSc example at:
102 // http://www.mcs.anl.gov/petsc/petsc-current/src/snes/examples/tutorials/ex1.c
103 // Which got it to work...
104 KSP ksp;
105 SNESGetKSP(snes,&ksp);
106 PC pc;
107 KSPGetPC(ksp,&pc);
108 PCSetType(pc,PCNONE);
109#endif
110
111#if (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 2) //PETSc 2.2
112 SNESSolve(snes, x);
113#else
114 SNESSolve(snes, CHASTE_PETSC_NULLPTR, x);
115#endif
116 PetscTools::Destroy(residual);
117 PetscTools::Destroy(jacobian); // Free Jacobian
118
119 SNESConvergedReason reason;
120 SNESGetConvergedReason(snes,&reason);
121// LCOV_EXCL_START
122 if (reason < 0)
123 {
124 std::stringstream reason_stream;
125 reason_stream << reason;
126 PetscTools::Destroy(x); // Since caller can't free the memory in this case
127 SNESDestroy(PETSC_DESTROY_PARAM(snes));
128 EXCEPTION("Nonlinear Solver did not converge. PETSc reason code:"
129 +reason_stream.str()+" .");
130 }
131// LCOV_EXCL_STOP
132 SNESDestroy(PETSC_DESTROY_PARAM(snes));
133
134 return x;
135}
#define EXCEPTION(message)
#define CHASTE_PETSC_NULLPTR
A macro to define PETSc null pointer based on the PETSc version.
#define PETSC_DESTROY_PARAM(x)
static void Destroy(Vec &rVec)
static void SetupMat(Mat &rMat, int numRows, int numColumns, unsigned rowPreallocation, int numLocalRows=PETSC_DECIDE, int numLocalColumns=PETSC_DECIDE, bool ignoreOffProcEntries=true, bool newAllocationError=true)
Vec Solve(PetscErrorCode(*pComputeResidual)(SNES, Vec, Vec, void *), PetscErrorCode(*pComputeJacobian)(SNES, Vec, Mat *, Mat *, MatStructure *, void *), Vec initialGuess, unsigned fill, void *pContext)