Actual source code: snesimpl.h
2: #ifndef __SNESIMPL_H
5: #include petscsnes.h
7: /*
8: Nonlinear solver context
9: */
10: #define MAXSNESMONITORS 5
12: struct _p_SNES {
13: PETSCHEADER(int);
15: /* Identifies this as a grid SNES structure */
16: PetscTruth isGSNES; /* This problem arises from an underlying grid */
18: /* ------------------------ User-provided stuff -------------------------------*/
19: void *user; /* user-defined context */
21: Vec vec_sol,vec_sol_always; /* pointer to solution */
22: Vec vec_sol_update_always; /* pointer to solution update */
24: PetscErrorCode (*computefunction)(SNES,Vec,Vec,void*); /* function routine */
25: Vec vec_func,vec_func_always; /* pointer to function */
26: Vec afine; /* If non-null solve F(x) = afine */
27: void *funP; /* user-defined function context */
29: PetscErrorCode (*computejacobian)(SNES,Vec,Mat*,Mat*,MatStructure*,void*);
30: Mat jacobian; /* Jacobian matrix */
31: Mat jacobian_pre; /* preconditioner matrix */
32: void *jacP; /* user-defined Jacobian context */
33: KSP ksp; /* linear solver context */
35: PetscErrorCode (*computescaling)(Vec,Vec,void*); /* scaling routine */
36: Vec scaling; /* scaling vector */
37: void *scaP; /* scaling context */
39: /* ------------------------Boundary conditions-----------------------------------*/
40: PetscErrorCode (*applyrhsbc)(SNES, Vec, void *); /* Applies boundary conditions to the rhs */
41: PetscErrorCode (*applysolbc)(SNES, Vec, void *); /* Applies boundary conditions to the solution */
43: /* ------------------------Time stepping hooks-----------------------------------*/
44: PetscErrorCode (*update)(SNES, PetscInt); /* General purpose function for update */
46: /* ---------------- PETSc-provided (or user-provided) stuff ---------------------*/
48: PetscErrorCode (*monitor[MAXSNESMONITORS])(SNES,PetscInt,PetscReal,void*); /* monitor routine */
49: PetscErrorCode (*monitordestroy[MAXSNESMONITORS])(void*); /* monitor context destroy routine */
50: void *monitorcontext[MAXSNESMONITORS]; /* monitor context */
51: PetscInt numbermonitors; /* number of monitors */
52: PetscErrorCode (*converged)(SNES,PetscReal,PetscReal,PetscReal,SNESConvergedReason*,void*); /* convergence routine */
53: void *cnvP; /* convergence context */
54: SNESConvergedReason reason;
56: /* --- Routines and data that are unique to each particular solver --- */
58: PetscErrorCode (*setup)(SNES); /* routine to set up the nonlinear solver */
59: PetscTruth setupcalled; /* true if setup has been called */
60: PetscErrorCode (*solve)(SNES); /* actual nonlinear solver */
61: PetscErrorCode (*setfromoptions)(SNES); /* sets options from database */
62: PetscErrorCode (*printhelp)(SNES,char*); /* prints help info */
63: void *data; /* implementation-specific data */
65: /* -------------------------- Parameters -------------------------------------- */
67: PetscInt max_its; /* max number of iterations */
68: PetscInt max_funcs; /* max number of function evals */
69: PetscInt nfuncs; /* number of function evaluations */
70: PetscInt iter; /* global iteration number */
71: PetscInt linear_its; /* total number of linear solver iterations */
72: PetscReal norm; /* residual norm of current iterate */
73: PetscReal rtol; /* relative tolerance */
74: PetscReal abstol; /* absolute tolerance */
75: PetscReal xtol; /* relative tolerance in solution */
76: PetscReal deltatol; /* trust region convergence tolerance */
77: PetscTruth printreason; /* print reason for convergence/divergence after each solve */
78: /* ------------------------ Default work-area management ---------------------- */
80: PetscInt nwork;
81: Vec *work;
83: /* ------------------------- Miscellaneous Information ------------------------ */
85: PetscReal *conv_hist; /* If !0, stores function norm (or
86: gradient norm) at each iteration */
87: PetscInt *conv_hist_its; /* linear iterations for each Newton step */
88: PetscInt conv_hist_len; /* size of convergence history array */
89: PetscInt conv_hist_max; /* actual amount of data in conv_history */
90: PetscTruth conv_hist_reset; /* reset counter for each new SNES solve */
91: PetscInt numFailures; /* number of unsuccessful step attempts */
92: PetscInt maxFailures; /* maximum number of unsuccessful step attempts */
94: /*
95: These are REALLY ugly and don't belong here, but since they must
96: be destroyed at the conclusion we have to put them somewhere.
97: */
98: PetscTruth ksp_ewconv; /* flag indicating use of Eisenstat-Walker KSP convergence criteria */
99: void *kspconvctx; /* KSP convergence context */
101: PetscReal ttol; /* used by default convergence test routine */
103: Vec *vwork; /* more work vectors for Jacobian approx */
104: PetscInt nvwork;
105: PetscErrorCode (*destroy)(SNES);
106: PetscErrorCode (*view)(SNES,PetscViewer);
107: };
109: /* Context for Eisenstat-Walker convergence criteria for KSP solvers */
110: typedef struct {
111: PetscInt version; /* flag indicating version 1 or 2 of test */
112: PetscReal rtol_0; /* initial rtol */
113: PetscReal rtol_last; /* last rtol */
114: PetscReal rtol_max; /* maximum rtol */
115: PetscReal gamma; /* mult. factor for version 2 rtol computation */
116: PetscReal alpha; /* power for version 2 rtol computation */
117: PetscReal alpha2; /* power for safeguard */
118: PetscReal threshold; /* threshold for imposing safeguard */
119: PetscReal lresid_last; /* linear residual from last iteration */
120: PetscReal norm_last; /* function norm from last iteration */
121: } SNES_KSP_EW_ConvCtx;
123: #define SNESLogConvHistory(snes,res,its) \
124: { if (snes->conv_hist && snes->conv_hist_max > snes->conv_hist_len) \
125: { if (snes->conv_hist) snes->conv_hist[snes->conv_hist_len] = res; \
126: if (snes->conv_hist_its) snes->conv_hist_its[snes->conv_hist_len] = its; \
127: snes->conv_hist_len++;\
128: }}
130: #define SNESMonitor(snes,it,rnorm) \
131: { PetscErrorCode _ierr; PetscInt _i,_im = snes->numbermonitors; \
132: for (_i=0; _i<_im; _i++) {\
133: _(*snes->monitor[_i])(snes,it,rnorm,snes->monitorcontext[_i]);CHKERRQ(_ierr); \
134: } \
135: }
137: PetscErrorCode SNES_KSP_EW_Converged_Private(KSP,PetscInt,PetscReal,KSPConvergedReason*,void*);
138: PetscErrorCode SNES_KSP_EW_ComputeRelativeTolerance_Private(SNES,KSP);
139: PetscErrorCode SNESScaleStep_Private(SNES,Vec,PetscReal*,PetscReal*,PetscReal*,PetscReal*);
141: #endif