Actual source code: dmfieldda.c
petsc-3.10.5 2019-03-28
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      1:  #include <petsc/private/dmfieldimpl.h>
      2:  #include <petsc/private/dmimpl.h>
      3:  #include <petscdmda.h>

      5: typedef struct _n_DMField_DA
      6: {
      7:   PetscScalar     *cornerVals;
      8:   PetscScalar     *cornerCoeffs;
      9:   PetscScalar     *work;
     10:   PetscReal       coordRange[3][2];
     11: }
     12: DMField_DA;

     14: static PetscErrorCode DMFieldDestroy_DA(DMField field)
     15: {
     16:   DMField_DA     *dafield;

     20:   dafield = (DMField_DA *) field->data;
     21:   PetscFree3(dafield->cornerVals,dafield->cornerCoeffs,dafield->work);
     22:   PetscFree(dafield);
     23:   return(0);
     24: }

     26: static PetscErrorCode DMFieldView_DA(DMField field,PetscViewer viewer)
     27: {
     28:   DMField_DA     *dafield = (DMField_DA *) field->data;
     29:   PetscBool      iascii;

     33:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);
     34:   if (iascii) {
     35:     PetscInt i, c, dim;
     36:     PetscInt nc;
     37:     DM       dm = field->dm;

     39:     PetscViewerASCIIPrintf(viewer, "Field corner values:\n");
     40:     PetscViewerASCIIPushTab(viewer);
     41:     DMGetDimension(dm,&dim);
     42:     nc = field->numComponents;
     43:     for (i = 0, c = 0; i < (1 << dim); i++) {
     44:       PetscInt j;

     46:       for (j = 0; j < nc; j++, c++) {
     47:         PetscScalar val = dafield->cornerVals[nc * i + j];

     49: #if !defined(PETSC_USE_COMPLEX)
     50:         PetscViewerASCIIPrintf(viewer,"%g ",(double) val);
     51: #else
     52:         PetscViewerASCIIPrintf(viewer,"%g+i%g ",(double) PetscRealPart(val),(double) PetscImaginaryPart(val));
     53: #endif
     54:       }
     55:       PetscViewerASCIIPrintf(viewer,"\n");
     56:     }
     57:     PetscViewerASCIIPopTab(viewer);
     58:   }
     59:   return(0);
     60: }

     62: #define MEdot(y,A,x,m,c,cast)                          \
     63:   do {                                                 \
     64:     PetscInt _k, _l;                                   \
     65:     for (_k = 0; _k < (c); _k++) (y)[_k] = 0.;         \
     66:     for (_l = 0; _l < (m); _l++) {                     \
     67:       for (_k = 0; _k < (c); _k++) {                   \
     68:         (y)[_k] += cast((A)[(c) * _l + _k]) * (x)[_l]; \
     69:       }                                                \
     70:     }                                                  \
     71:   } while (0)

     73: #define MEHess(out,cf,etaB,etaD,dim,nc,cast)                      \
     74:   do {                                                            \
     75:     PetscInt _m, _j, _k;                                          \
     76:     for (_m = 0; _m < (nc) * (dim) * (dim); _m++) (out)[_m] = 0.; \
     77:     for (_j = 0; _j < (dim); _j++) {                              \
     78:       for (_k = _j + 1; _k < (dim); _k++) {                       \
     79:         PetscInt _ind = (1 << _j) + (1 << _k);                    \
     80:         for (_m = 0; _m < (nc); _m++) {                           \
     81:           PetscScalar c = (cf)[_m] * (etaB)[_ind] * (etaD)[_ind];   \
     82:           (out)[(_m * (dim) + _k) * (dim) + _j] += cast(c);       \
     83:           (out)[(_m * (dim) + _j) * (dim) + _k] += cast(c);       \
     84:         }                                                         \
     85:       }                                                           \
     86:     }                                                             \
     87:   } while (0)

     89: static void MultilinearEvaluate(PetscInt dim, PetscReal (*coordRange)[2], PetscInt nc, PetscScalar *cf, PetscScalar *cfWork, PetscInt nPoints, const PetscScalar *points, PetscDataType datatype, void *B, void *D, void *H)
     90: {
     91:   PetscInt i, j, k, l, m;
     92:   PetscInt  whol = 1 << dim;
     93:   PetscInt  half = whol >> 1;

     96:   if (!B && !D && !H) PetscFunctionReturnVoid();
     97:   for (i = 0; i < nPoints; i++) {
     98:     const PetscScalar *point = &points[dim * i];
     99:     PetscReal deta[3] = {0.};
    100:     PetscReal etaB[8] = {1.,1.,1.,1.,1.,1.,1.,1.};
    101:     PetscReal etaD[8] = {1.,1.,1.,1.,1.,1.,1.,1.};
    102:     PetscReal work[8];

    104:     for (j = 0; j < dim; j++) {
    105:       PetscReal e, d;

    107:       e = (PetscRealPart(point[j]) - coordRange[j][0]) / coordRange[j][1];
    108:       deta[j] = d = 1. / coordRange[j][1];
    109:       for (k = 0; k < whol; k++) {work[k] = etaB[k];}
    110:       for (k = 0; k < half; k++) {
    111:         etaB[k]        = work[2 * k] * e;
    112:         etaB[k + half] = work[2 * k + 1];
    113:       }
    114:       if (H) {
    115:         for (k = 0; k < whol; k++) {work[k] = etaD[k];}
    116:         for (k = 0; k < half; k++) {
    117:           etaD[k + half] = work[2 * k];
    118:           etaD[k       ] = work[2 * k + 1] * d;
    119:         }
    120:       }
    121:     }
    122:     if (B) {
    123:       if (datatype == PETSC_SCALAR) {
    124:         PetscScalar *out = &((PetscScalar *)B)[nc * i];

    126:         MEdot(out,cf,etaB,(1 << dim),nc,(PetscScalar));
    127:       } else {
    128:         PetscReal *out = &((PetscReal *)B)[nc * i];

    130:         MEdot(out,cf,etaB,(1 << dim),nc,PetscRealPart);
    131:       }
    132:     }
    133:     if (D) {
    134:       if (datatype == PETSC_SCALAR) {
    135:         PetscScalar *out = &((PetscScalar *)D)[nc * dim * i];

    137:         for (m = 0; m < nc * dim; m++) out[m] = 0.;
    138:       } else {
    139:         PetscReal *out = &((PetscReal *)D)[nc * dim * i];

    141:         for (m = 0; m < nc * dim; m++) out[m] = 0.;
    142:       }
    143:       for (j = 0; j < dim; j++) {
    144:         PetscReal d = deta[j];

    146:         for (k = 0; k < whol * nc; k++) {cfWork[k] = cf[k];}
    147:         for (k = 0; k < whol; k++) {work[k] = etaB[k];}
    148:         for (k = 0; k < half; k++) {
    149:           PetscReal e;

    151:           etaB[k]        =     work[2 * k];
    152:           etaB[k + half] = e = work[2 * k + 1];

    154:           for (l = 0; l < nc; l++) {
    155:             cf[ k         * nc + l] = cfWork[ 2 * k      * nc + l];
    156:             cf[(k + half) * nc + l] = cfWork[(2 * k + 1) * nc + l];
    157:           }
    158:           if (datatype == PETSC_SCALAR) {
    159:             PetscScalar *out = &((PetscScalar *)D)[nc * dim * i];

    161:             for (l = 0; l < nc; l++) {
    162:               out[l * dim + j] += d * e * cf[k * nc + l];
    163:             }
    164:           } else {
    165:             PetscReal *out = &((PetscReal *)D)[nc * dim * i];

    167:             for (l = 0; l < nc; l++) {
    168:               out[l * dim + j] += d * e * PetscRealPart(cf[k * nc + l]);
    169:             }
    170:           }
    171:         }
    172:       }
    173:     }
    174:     if (H) {
    175:       if (datatype == PETSC_SCALAR) {
    176:         PetscScalar *out = &((PetscScalar *)H)[nc * dim * dim * i];

    178:         MEHess(out,cf,etaB,etaD,dim,nc,(PetscScalar));
    179:       } else {
    180:         PetscReal *out = &((PetscReal *)H)[nc * dim * dim * i];

    182:         MEHess(out,cf,etaB,etaD,dim,nc,PetscRealPart);
    183:       }
    184:     }
    185:   }
    186:   PetscFunctionReturnVoid();
    187: }

    189: static PetscErrorCode DMFieldEvaluate_DA(DMField field, Vec points, PetscDataType datatype, void *B, void *D, void *H)
    190: {
    191:   DM             dm;
    192:   DMField_DA     *dafield;
    193:   PetscInt       dim;
    194:   PetscInt       N, n, nc;
    195:   const PetscScalar *array;
    196:   PetscReal (*coordRange)[2];

    200:   dm      = field->dm;
    201:   nc      = field->numComponents;
    202:   dafield = (DMField_DA *) field->data;
    203:   DMGetDimension(dm,&dim);
    204:   VecGetLocalSize(points,&N);
    205:   if (N % dim) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_INCOMP,"Point vector size %D not divisible by coordinate dimension %D\n",N,dim);
    206:   n = N / dim;
    207:   coordRange = &(dafield->coordRange[0]);
    208:   VecGetArrayRead(points,&array);
    209:   MultilinearEvaluate(dim,coordRange,nc,dafield->cornerCoeffs,dafield->work,n,array,datatype,B,D,H);
    210:   VecRestoreArrayRead(points,&array);
    211:   return(0);
    212: }

    214: static PetscErrorCode DMFieldEvaluateFE_DA(DMField field, IS cellIS, PetscQuadrature points, PetscDataType datatype, void *B, void *D, void *H)
    215: {
    216:   PetscInt       c, i, j, k, dim, cellsPer[3] = {0}, first[3] = {0}, whol, half;
    217:   PetscReal      stepPer[3] = {0.};
    218:   PetscReal      cellCoordRange[3][2] = {{0.,1.},{0.,1.},{0.,1.}};
    219:   PetscScalar    *cellCoeffs, *work;
    220:   DM             dm;
    221:   DMDALocalInfo  info;
    222:   PetscInt       cStart, cEnd;
    223:   PetscInt       nq, nc;
    224:   const PetscReal *q;
    225: #if defined(PETSC_USE_COMPLEX)
    226:   PetscScalar    *qs;
    227: #else
    228:   const PetscScalar *qs;
    229: #endif
    230:   DMField_DA     *dafield;
    231:   PetscBool      isStride;
    232:   const PetscInt *cells = NULL;
    233:   PetscInt       sfirst = -1, stride = -1, nCells;

    237:   dafield = (DMField_DA *) field->data;
    238:   dm = field->dm;
    239:   nc = field->numComponents;
    240:   DMDAGetLocalInfo(dm,&info);
    241:   dim = info.dim;
    242:   work = dafield->work;
    243:   stepPer[0] = 1./ info.mx;
    244:   stepPer[1] = 1./ info.my;
    245:   stepPer[2] = 1./ info.mz;
    246:   first[0] = info.gxs;
    247:   first[1] = info.gys;
    248:   first[2] = info.gzs;
    249:   cellsPer[0] = info.gxm;
    250:   cellsPer[1] = info.gym;
    251:   cellsPer[2] = info.gzm;
    252:   /* TODO: probably take components into account */
    253:   PetscQuadratureGetData(points, NULL, NULL, &nq, &q, NULL);
    254: #if defined(PETSC_USE_COMPLEX)
    255:   DMGetWorkArray(dm,nq * dim,MPIU_SCALAR,&qs);
    256:   for (i = 0; i < nq * dim; i++) qs[i] = q[i];
    257: #else
    258:   qs = q;
    259: #endif
    260:   DMDAGetHeightStratum(dm,0,&cStart,&cEnd);
    261:   DMGetWorkArray(dm,(1 << dim) * nc,MPIU_SCALAR,&cellCoeffs);
    262:   whol = (1 << dim);
    263:   half = whol >> 1;
    264:   ISGetLocalSize(cellIS,&nCells);
    265:   PetscObjectTypeCompare((PetscObject)cellIS,ISSTRIDE,&isStride);
    266:   if (isStride) {
    267:     ISStrideGetInfo(cellIS,&sfirst,&stride);
    268:   } else {
    269:     ISGetIndices(cellIS,&cells);
    270:   }
    271:   for (c = 0; c < nCells; c++) {
    272:     PetscInt  cell = isStride ? (sfirst + c * stride) : cells[c];
    273:     PetscInt  rem  = cell;
    274:     PetscInt  ijk[3] = {0};
    275:     void *cB, *cD, *cH;

    277:     if (datatype == PETSC_SCALAR) {
    278:       cB = B ? &((PetscScalar *)B)[nc * nq * c] : NULL;
    279:       cD = D ? &((PetscScalar *)D)[nc * nq * dim * c] : NULL;
    280:       cH = H ? &((PetscScalar *)H)[nc * nq * dim * dim * c] : NULL;
    281:     } else {
    282:       cB = B ? &((PetscReal *)B)[nc * nq * c] : NULL;
    283:       cD = D ? &((PetscReal *)D)[nc * nq * dim * c] : NULL;
    284:       cH = H ? &((PetscReal *)H)[nc * nq * dim * dim * c] : NULL;
    285:     }
    286:     if (cell < cStart || cell >= cEnd) SETERRQ3(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Point %D not a cell [%D,%D), not implemented yet",cell,cStart,cEnd);
    287:     for (i = 0; i < nc * whol; i++) {work[i] = dafield->cornerCoeffs[i];}
    288:     for (j = 0; j < dim; j++) {
    289:       PetscReal e, d;
    290:       ijk[j] = (rem % cellsPer[j]);
    291:       rem /= cellsPer[j];

    293:       e = 2. * (ijk[j] + first[j] + 0.5) * stepPer[j] - 1.;
    294:       d = stepPer[j];
    295:       for (i = 0; i < half; i++) {
    296:         for (k = 0; k < nc; k++) {
    297:           cellCoeffs[ i         * nc + k] = work[ 2 * i * nc + k] * d;
    298:           cellCoeffs[(i + half) * nc + k] = work[ 2 * i * nc + k] * e + work[(2 * i + 1) * nc + k];
    299:         }
    300:       }
    301:       for (i = 0; i < whol * nc; i++) {work[i] = cellCoeffs[i];}
    302:     }
    303:     MultilinearEvaluate(dim,cellCoordRange,nc,cellCoeffs,dafield->work,nq,qs,datatype,cB,cD,cH);
    304:   }
    305:   if (!isStride) {
    306:     ISRestoreIndices(cellIS,&cells);
    307:   }
    308:   DMRestoreWorkArray(dm,(1 << dim) * nc,MPIU_SCALAR,&cellCoeffs);
    309: #if defined(PETSC_USE_COMPLEX)
    310:   DMRestoreWorkArray(dm,nq * dim,MPIU_SCALAR,&qs);
    311: #endif
    312:   return(0);
    313: }

    315: static PetscErrorCode DMFieldEvaluateFV_DA(DMField field, IS cellIS, PetscDataType datatype, void *B, void *D, void *H)
    316: {
    317:   PetscInt       c, i, dim, cellsPer[3] = {0}, first[3] = {0};
    318:   PetscReal      stepPer[3] = {0.};
    319:   DM             dm;
    320:   DMDALocalInfo  info;
    321:   PetscInt       cStart, cEnd, numCells;
    322:   PetscInt       nc;
    323:   PetscScalar    *points;
    324:   DMField_DA     *dafield;
    325:   PetscBool      isStride;
    326:   const PetscInt *cells = NULL;
    327:   PetscInt       sfirst = -1, stride = -1;

    331:   dafield = (DMField_DA *) field->data;
    332:   dm = field->dm;
    333:   nc = field->numComponents;
    334:   DMDAGetLocalInfo(dm,&info);
    335:   dim = info.dim;
    336:   stepPer[0] = 1./ info.mx;
    337:   stepPer[1] = 1./ info.my;
    338:   stepPer[2] = 1./ info.mz;
    339:   first[0] = info.gxs;
    340:   first[1] = info.gys;
    341:   first[2] = info.gzs;
    342:   cellsPer[0] = info.gxm;
    343:   cellsPer[1] = info.gym;
    344:   cellsPer[2] = info.gzm;
    345:   DMDAGetHeightStratum(dm,0,&cStart,&cEnd);
    346:   ISGetLocalSize(cellIS,&numCells);
    347:   DMGetWorkArray(dm,dim * numCells,MPIU_SCALAR,&points);
    348:   PetscObjectTypeCompare((PetscObject)cellIS,ISSTRIDE,&isStride);
    349:   if (isStride) {
    350:     ISStrideGetInfo(cellIS,&sfirst,&stride);
    351:   } else {
    352:     ISGetIndices(cellIS,&cells);
    353:   }
    354:   for (c = 0; c < numCells; c++) {
    355:     PetscInt  cell = isStride ? (sfirst + c * stride) : cells[c];
    356:     PetscInt  rem  = cell;
    357:     PetscInt  ijk[3] = {0};

    359:     if (cell < cStart || cell >= cEnd) SETERRQ3(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Point %D not a cell [%D,%D), not implemented yet",cell,cStart,cEnd);
    360:     for (i = 0; i < dim; i++) {
    361:       ijk[i] = (rem % cellsPer[i]);
    362:       rem /= cellsPer[i];
    363:       points[dim * c + i] = (ijk[i] + first[i] + 0.5) * stepPer[i];
    364:     }
    365:   }
    366:   if (!isStride) {
    367:     ISRestoreIndices(cellIS,&cells);
    368:   }
    369:   MultilinearEvaluate(dim,dafield->coordRange,nc,dafield->cornerCoeffs,dafield->work,numCells,points,datatype,B,D,H);
    370:   DMRestoreWorkArray(dm,dim * numCells,MPIU_SCALAR,&points);
    371:   return(0);
    372: }

    374: static PetscErrorCode DMFieldGetDegree_DA(DMField field, IS pointIS, PetscInt *minDegree, PetscInt *maxDegree)
    375: {
    376:   DM             dm;
    377:   PetscInt       dim, h, imin;

    381:   dm = field->dm;
    382:   ISGetMinMax(pointIS,&imin,NULL);
    383:   DMGetDimension(dm,&dim);
    384:   for (h = 0; h <= dim; h++) {
    385:     PetscInt hEnd;

    387:     DMDAGetHeightStratum(dm,h,NULL,&hEnd);
    388:     if (imin < hEnd) break;
    389:   }
    390:   dim -= h;
    391:   if (minDegree) *minDegree = 1;
    392:   if (maxDegree) *maxDegree = dim;
    393:   return(0);
    394: }

    396: static PetscErrorCode DMFieldCreateDefaultQuadrature_DA(DMField field, IS cellIS, PetscQuadrature *quad)
    397: {
    398:   PetscInt       h, dim, imax, imin;
    399:   DM             dm;

    403:   dm = field->dm;
    404:   ISGetMinMax(cellIS,&imin,&imax);
    405:   DMGetDimension(dm,&dim);
    406:   *quad = NULL;
    407:   for (h = 0; h <= dim; h++) {
    408:     PetscInt hStart, hEnd;

    410:     DMDAGetHeightStratum(dm,h,&hStart,&hEnd);
    411:     if (imin >= hStart && imax < hEnd) break;
    412:   }
    413:   dim -= h;
    414:   if (dim > 0) {
    415:     PetscDTGaussTensorQuadrature(dim, 1, 1, -1.0, 1.0, quad);
    416:   }

    418:   return(0);
    419: }

    421: static PetscErrorCode DMFieldInitialize_DA(DMField field)
    422: {
    423:   DM             dm;
    424:   Vec            coords = NULL;
    425:   PetscInt       dim, i, j, k;
    426:   DMField_DA     *dafield = (DMField_DA *) field->data;

    430:   field->ops->destroy                 = DMFieldDestroy_DA;
    431:   field->ops->evaluate                = DMFieldEvaluate_DA;
    432:   field->ops->evaluateFE              = DMFieldEvaluateFE_DA;
    433:   field->ops->evaluateFV              = DMFieldEvaluateFV_DA;
    434:   field->ops->getDegree               = DMFieldGetDegree_DA;
    435:   field->ops->createDefaultQuadrature = DMFieldCreateDefaultQuadrature_DA;
    436:   field->ops->view                    = DMFieldView_DA;
    437:   dm = field->dm;
    438:   DMGetDimension(dm,&dim);
    439:   if (dm->coordinates) coords = dm->coordinates;
    440:   else if (dm->coordinatesLocal) coords = dm->coordinatesLocal;
    441:   if (coords) {
    442:     PetscInt          n;
    443:     const PetscScalar *array;
    444:     PetscReal         mins[3][2] = {{PETSC_MAX_REAL,PETSC_MAX_REAL},{PETSC_MAX_REAL,PETSC_MAX_REAL},{PETSC_MAX_REAL,PETSC_MAX_REAL}};

    446:     VecGetLocalSize(coords,&n);
    447:     n /= dim;
    448:     VecGetArrayRead(coords,&array);
    449:     for (i = 0, k = 0; i < n; i++) {
    450:       for (j = 0; j < dim; j++, k++) {
    451:         PetscReal val = PetscRealPart(array[k]);

    453:         mins[j][0] = PetscMin(mins[j][0],val);
    454:         mins[j][1] = PetscMin(mins[j][1],-val);
    455:       }
    456:     }
    457:     VecRestoreArrayRead(coords,&array);
    458:     MPIU_Allreduce((PetscReal *) mins,&(dafield->coordRange[0][0]),2*dim,MPIU_REAL,MPI_MIN,PetscObjectComm((PetscObject)dm));
    459:     for (j = 0; j < dim; j++) {
    460:       dafield->coordRange[j][1] = -dafield->coordRange[j][1];
    461:     }
    462:   } else {
    463:     for (j = 0; j < dim; j++) {
    464:       dafield->coordRange[j][0] = 0.;
    465:       dafield->coordRange[j][1] = 1.;
    466:     }
    467:   }
    468:   for (j = 0; j < dim; j++) {
    469:     PetscReal avg = 0.5 * (dafield->coordRange[j][1] + dafield->coordRange[j][0]);
    470:     PetscReal dif = 0.5 * (dafield->coordRange[j][1] - dafield->coordRange[j][0]);

    472:     dafield->coordRange[j][0] = avg;
    473:     dafield->coordRange[j][1] = dif;
    474:   }
    475:   return(0);
    476: }

    478: PETSC_INTERN PetscErrorCode DMFieldCreate_DA(DMField field)
    479: {
    480:   DMField_DA     *dafield;

    484:   PetscNewLog(field,&dafield);
    485:   field->data = dafield;
    486:   DMFieldInitialize_DA(field);
    487:   return(0);
    488: }

    490: PetscErrorCode DMFieldCreateDA(DM dm, PetscInt nc, const PetscScalar *cornerValues,DMField *field)
    491: {
    492:   DMField        b;
    493:   DMField_DA     *dafield;
    494:   PetscInt       dim, nv, i, j, k;
    495:   PetscInt       half;
    496:   PetscScalar    *cv, *cf, *work;

    500:   DMFieldCreate(dm,nc,DMFIELD_VERTEX,&b);
    501:   DMFieldSetType(b,DMFIELDDA);
    502:   dafield = (DMField_DA *) b->data;
    503:   DMGetDimension(dm,&dim);
    504:   nv = (1 << dim) * nc;
    505:   PetscMalloc3(nv,&cv,nv,&cf,nv,&work);
    506:   for (i = 0; i < nv; i++) cv[i] = cornerValues[i];
    507:   for (i = 0; i < nv; i++) cf[i] = cv[i];
    508:   dafield->cornerVals = cv;
    509:   dafield->cornerCoeffs = cf;
    510:   dafield->work = work;
    511:   half = (1 << (dim - 1));
    512:   for (i = 0; i < dim; i++) {
    513:     PetscScalar *w;

    515:     w = work;
    516:     for (j = 0; j < half; j++) {
    517:       for (k = 0; k < nc; k++) {
    518:         w[j * nc + k] = 0.5 * (cf[(2 * j + 1) * nc + k] - cf[(2 * j) * nc + k]);
    519:       }
    520:     }
    521:     w = &work[j * nc];
    522:     for (j = 0; j < half; j++) {
    523:       for (k = 0; k < nc; k++) {
    524:         w[j * nc + k] = 0.5 * (cf[(2 * j) * nc + k] + cf[(2 * j + 1) * nc + k]);
    525:       }
    526:     }
    527:     for (j = 0; j < nv; j++) {cf[j] = work[j];}
    528:   }
    529:   *field = b;
    530:   return(0);
    531: }