Actual source code: smg.c
petsc-3.15.0 2021-03-30
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      2: /*
      3:      Additive Multigrid V Cycle routine
      4: */
      5: #include <petsc/private/pcmgimpl.h>

      7: PetscErrorCode PCMGACycle_Private(PC pc,PC_MG_Levels **mglevels,PetscBool transpose,PetscBool matapp)
      8: {
     10:   PetscInt       i,l = mglevels[0]->levels;

     13:   /* compute RHS on each level */
     14:   for (i=l-1; i>0; i--) {
     15:     if (mglevels[i]->eventinterprestrict) {PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0);}
     16:     if (!transpose) {
     17:       if (matapp) { MatMatRestrict(mglevels[i]->restrct,mglevels[i]->B,&mglevels[i-1]->B); }
     18:       else { MatRestrict(mglevels[i]->restrct,mglevels[i]->b,mglevels[i-1]->b); }
     19:     } else {
     20:       if (matapp) { MatMatRestrict(mglevels[i]->interpolate,mglevels[i]->B,&mglevels[i-1]->B); }
     21:       else { MatRestrict(mglevels[i]->interpolate,mglevels[i]->b,mglevels[i-1]->b); }
     22:     }
     23:     if (mglevels[i]->eventinterprestrict) {PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0);}
     24:   }
     25:   /* solve separately on each level */
     26:   for (i=0; i<l; i++) {
     27:     if (matapp) {
     28:       if (!mglevels[i]->X) {
     29:         MatDuplicate(mglevels[i]->B,MAT_DO_NOT_COPY_VALUES,&mglevels[i]->X);
     30:       } else {
     31:         MatZeroEntries(mglevels[i]->X);
     32:       }
     33:     } else {
     34:       VecZeroEntries(mglevels[i]->x);
     35:     }
     36:     if (mglevels[i]->eventsmoothsolve) {PetscLogEventBegin(mglevels[i]->eventsmoothsolve,0,0,0,0);}
     37:     if (!transpose) {
     38:       if (matapp) {
     39:         KSPMatSolve(mglevels[i]->smoothd,mglevels[i]->B,mglevels[i]->X);
     40:         KSPCheckSolve(mglevels[i]->smoothd,pc,NULL);
     41:       } else {
     42:         KSPSolve(mglevels[i]->smoothd,mglevels[i]->b,mglevels[i]->x);
     43:         KSPCheckSolve(mglevels[i]->smoothd,pc,mglevels[i]->x);
     44:       }
     45:     } else {
     46:       if (matapp) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Not supported");
     47:       KSPSolveTranspose(mglevels[i]->smoothu,mglevels[i]->b,mglevels[i]->x);
     48:       KSPCheckSolve(mglevels[i]->smoothu,pc,mglevels[i]->x);
     49:     }
     50:     if (mglevels[i]->eventsmoothsolve) {PetscLogEventEnd(mglevels[i]->eventsmoothsolve,0,0,0,0);}
     51:   }
     52:   for (i=1; i<l; i++) {
     53:     if (mglevels[i]->eventinterprestrict) {PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0);}
     54:     if (!transpose) {
     55:       if (matapp) { MatMatInterpolateAdd(mglevels[i]->interpolate,mglevels[i-1]->X,mglevels[i]->X,&mglevels[i]->X); }
     56:       else { MatInterpolateAdd(mglevels[i]->interpolate,mglevels[i-1]->x,mglevels[i]->x,mglevels[i]->x); }
     57:     } else {
     58:       if (matapp) { MatMatInterpolateAdd(mglevels[i]->restrct,mglevels[i-1]->X,mglevels[i]->X,&mglevels[i]->X); }
     59:       else { MatInterpolateAdd(mglevels[i]->restrct,mglevels[i-1]->x,mglevels[i]->x,mglevels[i]->x); }
     60:     }
     61:     if (mglevels[i]->eventinterprestrict) {PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0);}
     62:   }
     63:   return(0);
     64: }