Date: 2021-03-03T22:28:21+00:00

Actual source code: snesimpl.h
petsc-3.14.5 2021-03-03
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      1: #ifndef __SNESIMPL_H

      4: #include <petscsnes.h>
      5: #include <petsc/private/petscimpl.h>

      7: PETSC_EXTERN PetscBool SNESRegisterAllCalled;
      8: PETSC_EXTERN PetscErrorCode SNESRegisterAll(void);

     10: typedef struct _SNESOps *SNESOps;

     12: struct _SNESOps {
     13:   PetscErrorCode (*computeinitialguess)(SNES,Vec,void*);
     14:   PetscErrorCode (*computescaling)(Vec,Vec,void*);
     15:   PetscErrorCode (*update)(SNES, PetscInt);                     /* General purpose function for update */
     16:   PetscErrorCode (*converged)(SNES,PetscInt,PetscReal,PetscReal,PetscReal,SNESConvergedReason*,void*);
     17:   PetscErrorCode (*convergeddestroy)(void*);
     18:   PetscErrorCode (*setup)(SNES);                                /* routine to set up the nonlinear solver */
     19:   PetscErrorCode (*solve)(SNES);                                /* actual nonlinear solver */
     20:   PetscErrorCode (*view)(SNES,PetscViewer);
     21:   PetscErrorCode (*setfromoptions)(PetscOptionItems*,SNES);                       /* sets options from database */
     22:   PetscErrorCode (*destroy)(SNES);
     23:   PetscErrorCode (*reset)(SNES);
     24:   PetscErrorCode (*usercompute)(SNES,void**);
     25:   PetscErrorCode (*userdestroy)(void**);
     26:   PetscErrorCode (*computevariablebounds)(SNES,Vec,Vec);        /* user provided routine to set box constrained variable bounds */
     27:   PetscErrorCode (*computepfunction)(SNES,Vec,Vec,void*);
     28:   PetscErrorCode (*computepjacobian)(SNES,Vec,Mat,Mat,void*);
     29:   PetscErrorCode (*load)(SNES,PetscViewer);
     30: };

     32: /*
     33:    Nonlinear solver context
     34:  */
     35: #define MAXSNESMONITORS 5

     37: struct _p_SNES {
     38:   PETSCHEADER(struct _SNESOps);
     39:   DM        dm;
     40:   PetscBool dmAuto;             /* SNES created currently used DM automatically */
     41:   SNES      npc;
     42:   PCSide    npcside;
     43:   PetscBool usesnpc;            /* type can use a nonlinear preconditioner */

     45:   /*  ------------------------ User-provided stuff -------------------------------*/
     46:   void  *user;                   /* user-defined context */

     48:   Vec  vec_rhs;                  /* If non-null, solve F(x) = rhs */
     49:   Vec  vec_sol;                  /* pointer to solution */

     51:   Vec  vec_func;                 /* pointer to function */

     53:   Mat  jacobian;                 /* Jacobian matrix */
     54:   Mat  jacobian_pre;             /* preconditioner matrix */
     55:   void *initialguessP;           /* user-defined initial guess context */
     56:   KSP  ksp;                      /* linear solver context */
     57:   SNESLineSearch linesearch;     /* line search context */
     58:   PetscBool usesksp;
     59:   MatStructure matstruct;        /* Used by Picard solver */

     61:   Vec  vec_sol_update;           /* pointer to solution update */

     63:   Vec  scaling;                  /* scaling vector */
     64:   void *scaP;                    /* scaling context */

     66:   PetscReal precheck_picard_angle; /* For use with SNESLineSearchPreCheckPicard */

     68:   /* ------------------------Time stepping hooks-----------------------------------*/

     70:   /* ---------------- PETSc-provided (or user-provided) stuff ---------------------*/

     72:   PetscErrorCode      (*monitor[MAXSNESMONITORS])(SNES,PetscInt,PetscReal,void*); /* monitor routine */
     73:   PetscErrorCode      (*monitordestroy[MAXSNESMONITORS])(void**);                 /* monitor context destroy routine */
     74:   void                *monitorcontext[MAXSNESMONITORS];                           /* monitor context */
     75:   PetscInt            numbermonitors;                                             /* number of monitors */
     76:   void                *cnvP;                                                      /* convergence context */
     77:   SNESConvergedReason reason;
     78:   PetscBool           errorifnotconverged;

     80:   /* --- Routines and data that are unique to each particular solver --- */

     82:   PetscBool      setupcalled;                /* true if setup has been called */
     83:   void           *data;                      /* implementation-specific data */

     85:   /* --------------------------  Parameters -------------------------------------- */

     87:   PetscInt    max_its;            /* max number of iterations */
     88:   PetscInt    max_funcs;          /* max number of function evals */
     89:   PetscInt    nfuncs;             /* number of function evaluations */
     90:   PetscInt    iter;               /* global iteration number */
     91:   PetscInt    linear_its;         /* total number of linear solver iterations */
     92:   PetscReal   norm;               /* residual norm of current iterate */
     93:   PetscReal   ynorm;              /* update norm of current iterate */
     94:   PetscReal   xnorm;              /* solution norm of current iterate */
     95:   PetscReal   rtol;               /* relative tolerance */
     96:   PetscReal   divtol;             /* relative divergence tolerance */
     97:   PetscReal   abstol;             /* absolute tolerance */
     98:   PetscReal   stol;               /* step length tolerance*/
     99:   PetscReal   deltatol;           /* trust region convergence tolerance */
    100:   PetscBool   forceiteration;     /* Force SNES to take at least one iteration regardless of the initial residual norm */
    101:   PetscInt    lagpreconditioner;  /* SNESSetLagPreconditioner() */
    102:   PetscInt    lagjacobian;        /* SNESSetLagJacobian() */
    103:   PetscInt    jac_iter;           /* The present iteration of the Jacobian lagging */
    104:   PetscBool   lagjac_persist;     /* The jac_iter persists until reset */
    105:   PetscInt    pre_iter;           /* The present iteration of the Preconditioner lagging */
    106:   PetscBool   lagpre_persist;     /* The pre_iter persists until reset */
    107:   PetscInt    gridsequence;       /* number of grid sequence steps to take; defaults to zero */

    109:   PetscBool   tolerancesset;      /* SNESSetTolerances() called and tolerances should persist through SNESCreate_XXX()*/

    111:   PetscBool   vec_func_init_set;  /* the initial function has been set */

    113:   SNESNormSchedule normschedule;  /* Norm computation type for SNES instance */
    114:   SNESFunctionType functype;      /* Function type for the SNES instance */

    116:   /* ------------------------ Default work-area management ---------------------- */

    118:   PetscInt    nwork;
    119:   Vec         *work;

    121:   /* ------------------------- Miscellaneous Information ------------------------ */

    123:   PetscInt    setfromoptionscalled;
    124:   PetscReal   *conv_hist;         /* If !0, stores function norm (or
    125:                                     gradient norm) at each iteration */
    126:   PetscInt    *conv_hist_its;     /* linear iterations for each Newton step */
    127:   PetscInt    conv_hist_len;      /* size of convergence history array */
    128:   PetscInt    conv_hist_max;      /* actual amount of data in conv_history */
    129:   PetscBool   conv_hist_reset;    /* reset counter for each new SNES solve */
    130:   PetscBool   conv_hist_alloc;
    131:   PetscBool    counters_reset;    /* reset counter for each new SNES solve */

    133:   /* the next two are used for failures in the line search; they should be put elsewhere */
    134:   PetscInt    numFailures;        /* number of unsuccessful step attempts */
    135:   PetscInt    maxFailures;        /* maximum number of unsuccessful step attempts */

    137:   PetscInt    numLinearSolveFailures;
    138:   PetscInt    maxLinearSolveFailures;

    140:   PetscBool   domainerror;       /* set with SNESSetFunctionDomainError() */
    141:   PetscBool   jacobiandomainerror; /* set with SNESSetJacobianDomainError() */
    142:   PetscBool   checkjacdomainerror; /* if or not check Jacobian domain error after Jacobian evaluations */

    144:   PetscBool   ksp_ewconv;        /* flag indicating use of Eisenstat-Walker KSP convergence criteria */
    145:   void        *kspconvctx;       /* Eisenstat-Walker KSP convergence context */

    147:   /* SNESConvergedDefault context: split it off into a separate var/struct to be passed as context to SNESConvergedDefault? */
    148:   PetscReal   ttol;              /* rtol*initial_residual_norm */
    149:   PetscReal   rnorm0;            /* initial residual norm (used for divergence testing) */

    151:   Vec         *vwork;            /* more work vectors for Jacobian approx */
    152:   PetscInt    nvwork;

    154:   PetscBool   mf;               /* -snes_mf was used on this snes */
    155:   PetscBool   mf_operator;      /* -snes_mf_operator was used on this snes */
    156:   PetscInt    mf_version;       /* The version of snes_mf used */

    158:   PetscReal   vizerotolerance;   /* tolerance for considering an x[] value to be on the bound */
    159:   Vec         xl,xu;             /* upper and lower bounds for box constrained VI problems */
    160:   PetscInt    ntruebounds;       /* number of non-infinite bounds set for VI box constraints */
    161:   PetscBool   usersetbounds;     /* bounds have been set via SNESVISetVariableBounds(), rather than via computevariablebounds() callback. */

    163:   PetscBool   alwayscomputesfinalresidual;  /* Does SNESSolve_XXX always compute the value of the residual at the final
    164:                                              * solution and put it in vec_func?  Used inside SNESSolve_FAS to determine
    165:                                              * if the final residual must be computed before restricting or prolonging
    166:                                              * it. */

    168: };

    170: typedef struct _p_DMSNES *DMSNES;
    171: typedef struct _DMSNESOps *DMSNESOps;
    172: struct _DMSNESOps {
    173:   PetscErrorCode (*computefunction)(SNES,Vec,Vec,void*);
    174:   PetscErrorCode (*computejacobian)(SNES,Vec,Mat,Mat,void*);

    176:   /* objective */
    177:   PetscErrorCode (*computeobjective)(SNES,Vec,PetscReal*,void*);

    179:   /* Picard iteration functions */
    180:   PetscErrorCode (*computepfunction)(SNES,Vec,Vec,void*);
    181:   PetscErrorCode (*computepjacobian)(SNES,Vec,Mat,Mat,void*);

    183:   /* User-defined smoother */
    184:   PetscErrorCode (*computegs)(SNES,Vec,Vec,void*);

    186:   PetscErrorCode (*destroy)(DMSNES);
    187:   PetscErrorCode (*duplicate)(DMSNES,DMSNES);
    188: };

    190: struct _p_DMSNES {
    191:   PETSCHEADER(struct _DMSNESOps);
    192:   void *functionctx;
    193:   void *gsctx;
    194:   void *pctx;
    195:   void *jacobianctx;
    196:   void *objectivectx;

    198:   void *data;

    200:   /* This is NOT reference counted. The DM on which this context was first created is cached here to implement one-way
    201:    * copy-on-write. When DMGetDMSNESWrite() sees a request using a different DM, it makes a copy. Thus, if a user
    202:    * only interacts directly with one level, e.g., using SNESSetFunction(), then SNESSetUp_FAS() is called to build
    203:    * coarse levels, then the user changes the routine with another call to SNESSetFunction(), it automatically
    204:    * propagates to all the levels. If instead, they get out a specific level and set the function on that level,
    205:    * subsequent changes to the original level will no longer propagate to that level.
    206:    */
    207:   DM originaldm;
    208: };
    209: PETSC_EXTERN PetscErrorCode DMGetDMSNES(DM,DMSNES*);
    210: PETSC_EXTERN PetscErrorCode DMSNESView(DMSNES,PetscViewer);
    211: PETSC_EXTERN PetscErrorCode DMSNESLoad(DMSNES,PetscViewer);
    212: PETSC_EXTERN PetscErrorCode DMGetDMSNESWrite(DM,DMSNES*);

    215: /* Context for Eisenstat-Walker convergence criteria for KSP solvers */
    216: typedef struct {
    217:   PetscInt  version;             /* flag indicating version 1 or 2 of test */
    218:   PetscReal rtol_0;              /* initial rtol */
    219:   PetscReal rtol_last;           /* last rtol */
    220:   PetscReal rtol_max;            /* maximum rtol */
    221:   PetscReal gamma;               /* mult. factor for version 2 rtol computation */
    222:   PetscReal alpha;               /* power for version 2 rtol computation */
    223:   PetscReal alpha2;              /* power for safeguard */
    224:   PetscReal threshold;           /* threshold for imposing safeguard */
    225:   PetscReal lresid_last;         /* linear residual from last iteration */
    226:   PetscReal norm_last;           /* function norm from last iteration */
    227:   PetscReal norm_first;          /* function norm from the beginning of the first iteration. */
    228: } SNESKSPEW;

    230: PETSC_STATIC_INLINE PetscErrorCode SNESLogConvergenceHistory(SNES snes,PetscReal res,PetscInt its)
    231: {

    235:   PetscObjectSAWsTakeAccess((PetscObject)snes);
    236:   if (snes->conv_hist && snes->conv_hist_max > snes->conv_hist_len) {
    237:     if (snes->conv_hist)     snes->conv_hist[snes->conv_hist_len]     = res;
    238:     if (snes->conv_hist_its) snes->conv_hist_its[snes->conv_hist_len] = its;
    239:     snes->conv_hist_len++;
    240:   }
    241:   PetscObjectSAWsGrantAccess((PetscObject)snes);
    242:   return(0);
    243: }

    245: PETSC_EXTERN PetscErrorCode SNESVIProjectOntoBounds(SNES,Vec);
    246: PETSC_INTERN PetscErrorCode SNESVICheckLocalMin_Private(SNES,Mat,Vec,Vec,PetscReal,PetscBool*);
    247: PETSC_INTERN PetscErrorCode SNESReset_VI(SNES);
    248: PETSC_INTERN PetscErrorCode SNESDestroy_VI(SNES);
    249: PETSC_INTERN PetscErrorCode SNESView_VI(SNES,PetscViewer);
    250: PETSC_INTERN PetscErrorCode SNESSetFromOptions_VI(PetscOptionItems*,SNES);
    251: PETSC_INTERN PetscErrorCode SNESSetUp_VI(SNES);
    252: PETSC_EXTERN_TYPEDEF typedef PetscErrorCode (*SNESVIComputeVariableBoundsFunction)(SNES,Vec,Vec);
    253: PETSC_INTERN PetscErrorCode SNESVISetComputeVariableBounds_VI(SNES,SNESVIComputeVariableBoundsFunction);
    254: PETSC_INTERN PetscErrorCode SNESVISetVariableBounds_VI(SNES,Vec,Vec);
    255: PETSC_INTERN PetscErrorCode SNESConvergedDefault_VI(SNES,PetscInt,PetscReal,PetscReal,PetscReal,SNESConvergedReason*,void*);

    257: PetscErrorCode SNESScaleStep_Private(SNES,Vec,PetscReal*,PetscReal*,PetscReal*,PetscReal*);
    258: PETSC_EXTERN PetscErrorCode DMSNESCheck_Internal(SNES,DM,Vec);

    260: PETSC_EXTERN PetscLogEvent SNES_Solve;
    261: PETSC_EXTERN PetscLogEvent SNES_Setup;
    262: PETSC_EXTERN PetscLogEvent SNES_LineSearch;
    263: PETSC_EXTERN PetscLogEvent SNES_FunctionEval;
    264: PETSC_EXTERN PetscLogEvent SNES_JacobianEval;
    265: PETSC_EXTERN PetscLogEvent SNES_NGSEval;
    266: PETSC_EXTERN PetscLogEvent SNES_NGSFuncEval;
    267: PETSC_EXTERN PetscLogEvent SNES_NPCSolve;
    268: PETSC_EXTERN PetscLogEvent SNES_ObjectiveEval;

    270: PETSC_INTERN PetscBool SNEScite;
    271: PETSC_INTERN const char SNESCitation[];

    273: /*
    274:     Either generate an error or mark as diverged when a real from a SNES function norm is Nan or Inf.
    275:     domainerror is reset here, once reason is set, to allow subsequent iterations to be feasible (e.g. line search).
    276: */
    277: #define SNESCheckFunctionNorm(snes,beta) do { \
    278:   if (PetscIsInfOrNanReal(beta)) {\
    279:     if (snes->errorifnotconverged) SETERRQ(PetscObjectComm((PetscObject)snes),PETSC_ERR_NOT_CONVERGED,"SNESSolve has not converged due to Nan or Inf norm");\
    280:     else {\
    281:       PetscBool domainerror;\
    282:       PetscErrorCode MPIU_Allreduce(&snes->domainerror,&domainerror,1,MPIU_BOOL,MPI_LOR,PetscObjectComm((PetscObject)snes));\
    283:       if (domainerror)  {\
    284:         snes->reason = SNES_DIVERGED_FUNCTION_DOMAIN;\
    285:         snes->domainerror = PETSC_FALSE;\
    286:       } else snes->reason = SNES_DIVERGED_FNORM_NAN;\
    287:       return(0);\
    288:     }\
    289:   } } while (0)

    291: #define SNESCheckJacobianDomainerror(snes) do { \
    292:   if (snes->checkjacdomainerror) {\
    293:     PetscBool domainerror;\
    294:     PetscErrorCode MPIU_Allreduce(&snes->jacobiandomainerror,&domainerror,1,MPIU_BOOL,MPI_LOR,PetscObjectComm((PetscObject)snes));\
    295:     if (domainerror) {\
    296:       snes->reason = SNES_DIVERGED_JACOBIAN_DOMAIN;\
    297:       if (snes->errorifnotconverged) SETERRQ(PetscObjectComm((PetscObject)snes),PETSC_ERR_NOT_CONVERGED,"SNESSolve has not converged due to Jacobian domain error");\
    298:       return(0);\
    299:     }\
    300:   } } while (0)

    302: #define SNESCheckKSPSolve(snes)\
    303:   do {\
    304:     KSPConvergedReason kspreason; \
    306:     PetscInt lits;                                                      \
    307:     KSPGetIterationNumber(snes->ksp,&lits);        \
    308:     snes->linear_its += lits;                                           \
    309:     KSPGetConvergedReason(snes->ksp,&kspreason);\
    310:     if (kspreason < 0) {\
    311:       if (kspreason == KSP_DIVERGED_NANORINF) {\
    312:         PetscBool domainerror;\
    313:         MPIU_Allreduce(&snes->domainerror,&domainerror,1,MPIU_BOOL,MPI_LOR,PetscObjectComm((PetscObject)snes));\
    314:         if (domainerror)  snes->reason = SNES_DIVERGED_FUNCTION_DOMAIN;\
    315:         else              snes->reason = SNES_DIVERGED_LINEAR_SOLVE;                  \
    316:         return(0);\
    317:       } else {\
    318:         if (++snes->numLinearSolveFailures >= snes->maxLinearSolveFailures) {\
    319:           PetscInfo3(snes,"iter=%D, number linear solve failures %D greater than current SNES allowed %D, stopping solve\n",snes->iter,snes->numLinearSolveFailures,snes->maxLinearSolveFailures);\
    320:           snes->reason = SNES_DIVERGED_LINEAR_SOLVE;\
    321:           return(0);\
    322:         }\
    323:       }\
    324:     }\
    325:   } while (0)

    327: #endif