Date: 2016-07-24T17:14:47+00:00

Actual source code: dmlocalts.c
petsc-3.7.3 2016-07-24
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      1: #include <petsc/private/dmimpl.h>
      2: #include <petsc/private/tsimpl.h>   /*I "petscts.h" I*/

      4: typedef struct {
      5:   PetscErrorCode (*boundarylocal)(DM,PetscReal,Vec,Vec,void*);
      6:   PetscErrorCode (*ifunctionlocal)(DM,PetscReal,Vec,Vec,Vec,void*);
      7:   PetscErrorCode (*ijacobianlocal)(DM,PetscReal,Vec,Vec,PetscReal,Mat,Mat,void*);
      8:   PetscErrorCode (*rhsfunctionlocal)(DM,PetscReal,Vec,Vec,void*);
      9:   void *boundarylocalctx;
     10:   void *ifunctionlocalctx;
     11:   void *ijacobianlocalctx;
     12:   void *rhsfunctionlocalctx;
     13: } DMTS_Local;

     17: static PetscErrorCode DMTSDestroy_DMLocal(DMTS tdm)
     18: {

     22:   PetscFree(tdm->data);
     23:   return(0);
     24: }

     28: static PetscErrorCode DMTSDuplicate_DMLocal(DMTS oldtdm, DMTS tdm)
     29: {

     33:   PetscNewLog(tdm, (DMTS_Local **) &tdm->data);
     34:   if (oldtdm->data) {PetscMemcpy(tdm->data, oldtdm->data, sizeof(DMTS_Local));}
     35:   return(0);
     36: }

     40: static PetscErrorCode DMLocalTSGetContext(DM dm, DMTS tdm, DMTS_Local **dmlocalts)
     41: {

     45:   *dmlocalts = NULL;
     46:   if (!tdm->data) {
     47:     PetscNewLog(dm, (DMTS_Local **) &tdm->data);

     49:     tdm->ops->destroy   = DMTSDestroy_DMLocal;
     50:     tdm->ops->duplicate = DMTSDuplicate_DMLocal;
     51:   }
     52:   *dmlocalts = (DMTS_Local *) tdm->data;
     53:   return(0);
     54: }

     58: static PetscErrorCode TSComputeIFunction_DMLocal(TS ts, PetscReal time, Vec X, Vec X_t, Vec F, void *ctx)
     59: {
     60:   DM             dm;
     61:   Vec            locX, locX_t, locF;
     62:   DMTS_Local    *dmlocalts = (DMTS_Local *) ctx;

     70:   TSGetDM(ts, &dm);
     71:   DMGetLocalVector(dm, &locX);
     72:   DMGetLocalVector(dm, &locX_t);
     73:   DMGetLocalVector(dm, &locF);
     74:   VecZeroEntries(locX);
     75:   VecZeroEntries(locX_t);
     76:   if (dmlocalts->boundarylocal) {(*dmlocalts->boundarylocal)(dm, time, locX, locX_t,dmlocalts->boundarylocalctx);}
     77:   DMGlobalToLocalBegin(dm, X, INSERT_VALUES, locX);
     78:   DMGlobalToLocalEnd(dm, X, INSERT_VALUES, locX);
     79:   DMGlobalToLocalBegin(dm, X_t, INSERT_VALUES, locX_t);
     80:   DMGlobalToLocalEnd(dm, X_t, INSERT_VALUES, locX_t);
     81:   VecZeroEntries(locF);
     82:   CHKMEMQ;
     83:   (*dmlocalts->ifunctionlocal)(dm, time, locX, locX_t, locF, dmlocalts->ifunctionlocalctx);
     84:   CHKMEMQ;
     85:   VecZeroEntries(F);
     86:   DMLocalToGlobalBegin(dm, locF, ADD_VALUES, F);
     87:   DMLocalToGlobalEnd(dm, locF, ADD_VALUES, F);
     88:   DMRestoreLocalVector(dm, &locX);
     89:   DMRestoreLocalVector(dm, &locX_t);
     90:   DMRestoreLocalVector(dm, &locF);
     91:   return(0);
     92: }

     96: static PetscErrorCode TSComputeRHSFunction_DMLocal(TS ts, PetscReal time, Vec X, Vec F, void *ctx)
     97: {
     98:   DM             dm;
     99:   Vec            locX;
    100:   DMTS_Local    *dmlocalts = (DMTS_Local *) ctx;

    107:   TSGetDM(ts, &dm);
    108:   DMGetLocalVector(dm, &locX);
    109:   VecZeroEntries(locX);
    110:   if (dmlocalts->boundarylocal) {(*dmlocalts->boundarylocal)(dm,time,locX,NULL,dmlocalts->boundarylocalctx);}
    111:   DMGlobalToLocalBegin(dm, X, INSERT_VALUES, locX);
    112:   DMGlobalToLocalEnd(dm, X, INSERT_VALUES, locX);
    113:   VecZeroEntries(F);
    114:   CHKMEMQ;
    115:   (*dmlocalts->rhsfunctionlocal)(dm, time, locX, F, dmlocalts->rhsfunctionlocalctx);
    116:   CHKMEMQ;
    117:   DMRestoreLocalVector(dm, &locX);
    118:   return(0);
    119: }

    123: static PetscErrorCode TSComputeIJacobian_DMLocal(TS ts, PetscReal time, Vec X, Vec X_t, PetscReal a, Mat A, Mat B, void *ctx)
    124: {
    125:   DM             dm;
    126:   Vec            locX, locX_t;
    127:   DMTS_Local    *dmlocalts = (DMTS_Local *) ctx;

    131:   TSGetDM(ts, &dm);
    132:   if (dmlocalts->ijacobianlocal) {
    133:     DMGetLocalVector(dm, &locX);
    134:     DMGetLocalVector(dm, &locX_t);
    135:     VecZeroEntries(locX);
    136:     if (dmlocalts->boundarylocal) {(*dmlocalts->boundarylocal)(dm,time,locX,locX_t,dmlocalts->boundarylocalctx);}
    137:     VecZeroEntries(locX_t);
    138:     DMGlobalToLocalBegin(dm, X, INSERT_VALUES, locX);
    139:     DMGlobalToLocalEnd(dm, X, INSERT_VALUES, locX);
    140:     DMGlobalToLocalBegin(dm, X_t, INSERT_VALUES, locX_t);
    141:     DMGlobalToLocalEnd(dm, X_t, INSERT_VALUES, locX_t);
    142:     CHKMEMQ;
    143:     (*dmlocalts->ijacobianlocal)(dm, time, locX, locX_t, a, A, B, dmlocalts->ijacobianlocalctx);
    144:     CHKMEMQ;
    145:     DMRestoreLocalVector(dm, &locX);
    146:     DMRestoreLocalVector(dm, &locX_t);
    147:   } else {
    148:     MatFDColoring fdcoloring;
    149:     PetscObjectQuery((PetscObject) dm, "DMDASNES_FDCOLORING", (PetscObject *) &fdcoloring);
    150:     if (!fdcoloring) {
    151:       ISColoring coloring;

    153:       DMCreateColoring(dm, dm->coloringtype, &coloring);
    154:       MatFDColoringCreate(B, coloring, &fdcoloring);
    155:       ISColoringDestroy(&coloring);
    156:       switch (dm->coloringtype) {
    157:       case IS_COLORING_GLOBAL:
    158:         MatFDColoringSetFunction(fdcoloring, (PetscErrorCode (*)(void)) TSComputeIFunction_DMLocal, dmlocalts);
    159:         break;
    160:       default: SETERRQ1(PetscObjectComm((PetscObject) ts), PETSC_ERR_SUP, "No support for coloring type '%s'", ISColoringTypes[dm->coloringtype]);
    161:       }
    162:       PetscObjectSetOptionsPrefix((PetscObject) fdcoloring, ((PetscObject) dm)->prefix);
    163:       MatFDColoringSetFromOptions(fdcoloring);
    164:       MatFDColoringSetUp(B, coloring, fdcoloring);
    165:       PetscObjectCompose((PetscObject) dm, "DMDASNES_FDCOLORING", (PetscObject) fdcoloring);
    166:       PetscObjectDereference((PetscObject) fdcoloring);

    168:       /* The following breaks an ugly reference counting loop that deserves a paragraph. MatFDColoringApply() will call
    169:        * VecDuplicate() with the state Vec and store inside the MatFDColoring. This Vec will duplicate the Vec, but the
    170:        * MatFDColoring is composed with the DM. We dereference the DM here so that the reference count will eventually
    171:        * drop to 0. Note the code in DMDestroy() that exits early for a negative reference count. That code path will be
    172:        * taken when the PetscObjectList for the Vec inside MatFDColoring is destroyed.
    173:        */
    174:       PetscObjectDereference((PetscObject) dm);
    175:     }
    176:     MatFDColoringApply(B, fdcoloring, X, ts);
    177:   }
    178:   /* This will be redundant if the user called both, but it's too common to forget. */
    179:   if (A != B) {
    180:     MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY);
    181:     MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY);
    182:   }
    183:   return(0);
    184: }

    188: /*@C
    189:   DMTSSetBoundaryLocal - set the function for essential boundary data for a local implicit function evaluation.
    190:     It should set the essential boundary data for the local portion of the solution X, as well its time derivative X_t (if it is not NULL).
    191:     Vectors are initialized to zero before this function, so it is only needed for non homogeneous data.

    193:   Note that this function is somewhat optional: boundary data could potentially be inserted by a function passed to
    194:   DMTSSetIFunctionLocal().  The use case for this function is for discretizations with constraints (see
    195:   DMGetDefaultConstraints()): this function inserts boundary values before constraint interpolation.

    197:   Logically Collective

    199:   Input Arguments:
    200: + dm   - DM to associate callback with
    201: . func - local function evaluation
    202: - ctx  - context for function evaluation

    204:   Level: intermediate

    206: .seealso: DMTSSetIFunction(), DMTSSetIJacobianLocal()
    207: @*/
    208: PetscErrorCode DMTSSetBoundaryLocal(DM dm, PetscErrorCode (*func)(DM, PetscReal, Vec, Vec, void *), void *ctx)
    209: {
    210:   DMTS           tdm;
    211:   DMTS_Local    *dmlocalts;

    216:   DMGetDMTSWrite(dm, &tdm);
    217:   DMLocalTSGetContext(dm, tdm, &dmlocalts);

    219:   dmlocalts->boundarylocal    = func;
    220:   dmlocalts->boundarylocalctx = ctx;

    222:   return(0);
    223: }

    227: /*@C
    228:   DMTSSetIFunctionLocal - set a local implicit function evaluation function. This function is called with local vector
    229:       containing the local vector information PLUS ghost point information. It should compute a result for all local
    230:       elements and DMTS will automatically accumulate the overlapping values.

    232:   Logically Collective

    234:   Input Arguments:
    235: + dm   - DM to associate callback with
    236: . func - local function evaluation
    237: - ctx  - context for function evaluation

    239:   Level: beginner

    241: .seealso: DMTSSetIFunction(), DMTSSetIJacobianLocal()
    242: @*/
    243: PetscErrorCode DMTSSetIFunctionLocal(DM dm, PetscErrorCode (*func)(DM, PetscReal, Vec, Vec, Vec, void *), void *ctx)
    244: {
    245:   DMTS           tdm;
    246:   DMTS_Local    *dmlocalts;

    251:   DMGetDMTSWrite(dm, &tdm);
    252:   DMLocalTSGetContext(dm, tdm, &dmlocalts);

    254:   dmlocalts->ifunctionlocal    = func;
    255:   dmlocalts->ifunctionlocalctx = ctx;

    257:   DMTSSetIFunction(dm, TSComputeIFunction_DMLocal, dmlocalts);
    258:   if (!tdm->ops->ijacobian) {  /* Call us for the Jacobian too, can be overridden by the user. */
    259:     DMTSSetIJacobian(dm, TSComputeIJacobian_DMLocal, dmlocalts);
    260:   }
    261:   return(0);
    262: }

    266: /*@C
    267:   DMTSSetIJacobianLocal - set a local Jacobian evaluation function

    269:   Logically Collective

    271:   Input Arguments:
    272: + dm - DM to associate callback with
    273: . func - local Jacobian evaluation
    274: - ctx - optional context for local Jacobian evaluation

    276:   Level: beginner

    278: .seealso: DMTSSetIFunctionLocal(), DMTSSetIJacobian(), DMTSSetIFunction()
    279: @*/
    280: PetscErrorCode DMTSSetIJacobianLocal(DM dm, PetscErrorCode (*func)(DM, PetscReal, Vec, Vec, PetscReal, Mat, Mat, void *), void *ctx)
    281: {
    282:   DMTS           tdm;
    283:   DMTS_Local    *dmlocalts;

    288:   DMGetDMTSWrite(dm, &tdm);
    289:   DMLocalTSGetContext(dm, tdm, &dmlocalts);

    291:   dmlocalts->ijacobianlocal    = func;
    292:   dmlocalts->ijacobianlocalctx = ctx;

    294:   DMTSSetIJacobian(dm, TSComputeIJacobian_DMLocal, dmlocalts);
    295:   return(0);
    296: }

    300: /*@C
    301:   DMTSSetRHSFunctionLocal - set a local rhs function evaluation function. This function is called with local vector
    302:       containing the local vector information PLUS ghost point information. It should compute a result for all local
    303:       elements and DMTS will automatically accumulate the overlapping values.

    305:   Logically Collective

    307:   Input Arguments:
    308: + dm   - DM to associate callback with
    309: . func - local function evaluation
    310: - ctx  - context for function evaluation

    312:   Level: beginner

    314: .seealso: DMTSSetRHSFunction(), DMTSSetIFunction(), DMTSSetIJacobianLocal()
    315: @*/
    316: PetscErrorCode DMTSSetRHSFunctionLocal(DM dm, PetscErrorCode (*func)(DM, PetscReal, Vec, Vec, void *), void *ctx)
    317: {
    318:   DMTS           tdm;
    319:   DMTS_Local    *dmlocalts;

    324:   DMGetDMTSWrite(dm, &tdm);
    325:   DMLocalTSGetContext(dm, tdm, &dmlocalts);

    327:   dmlocalts->rhsfunctionlocal    = func;
    328:   dmlocalts->rhsfunctionlocalctx = ctx;

    330:   DMTSSetRHSFunction(dm, TSComputeRHSFunction_DMLocal, dmlocalts);
    331:   return(0);
    332: }