Actual source code: fmg.c
petsc-3.10.5 2019-03-28
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      1: /*
      2:      Full multigrid using either additive or multiplicative V or W cycle
      3: */
      4:  #include <petsc/private/pcmgimpl.h>

      6: extern PetscErrorCode PCMGMCycle_Private(PC,PC_MG_Levels**,PCRichardsonConvergedReason*);

      8: PetscErrorCode PCMGFCycle_Private(PC pc,PC_MG_Levels **mglevels)
      9: {
     11:   PetscInt       i,l = mglevels[0]->levels;

     14:   /* restrict the RHS through all levels to coarsest. */
     15:   for (i=l-1; i>0; i--) {
     16:     if (mglevels[i]->eventinterprestrict) {PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0);}
     17:     MatRestrict(mglevels[i]->restrct,mglevels[i]->b,mglevels[i-1]->b);
     18:     if (mglevels[i]->eventinterprestrict) {PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0);}
     19:   }

     21:   /* work our way up through the levels */
     22:   VecSet(mglevels[0]->x,0.0);
     23:   for (i=0; i<l-1; i++) {
     24:     PCMGMCycle_Private(pc,&mglevels[i],NULL);
     25:     if (mglevels[i+1]->eventinterprestrict) {PetscLogEventBegin(mglevels[i+1]->eventinterprestrict,0,0,0,0);}
     26:     MatInterpolate(mglevels[i+1]->interpolate,mglevels[i]->x,mglevels[i+1]->x);
     27:     if (mglevels[i+1]->eventinterprestrict) {PetscLogEventEnd(mglevels[i+1]->eventinterprestrict,0,0,0,0);}
     28:   }
     29:   PCMGMCycle_Private(pc,&mglevels[l-1],NULL);
     30:   return(0);
     31: }

     33: PetscErrorCode PCMGKCycle_Private(PC pc,PC_MG_Levels **mglevels)
     34: {
     36:   PetscInt       i,l = mglevels[0]->levels;

     39:   /* restrict the RHS through all levels to coarsest. */
     40:   for (i=l-1; i>0; i--) {
     41:     if (mglevels[i]->eventinterprestrict) {PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0);}
     42:     MatRestrict(mglevels[i]->restrct,mglevels[i]->b,mglevels[i-1]->b);
     43:     if (mglevels[i]->eventinterprestrict) {PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0);}
     44:   }

     46:   /* work our way up through the levels */
     47:   VecSet(mglevels[0]->x,0.0);
     48:   for (i=0; i<l-1; i++) {
     49:     if (mglevels[i]->eventsmoothsolve) {PetscLogEventBegin(mglevels[i]->eventsmoothsolve,0,0,0,0);}
     50:     KSPSolve(mglevels[i]->smoothd,mglevels[i]->b,mglevels[i]->x);
     51:     if (mglevels[i]->eventsmoothsolve) {PetscLogEventEnd(mglevels[i]->eventsmoothsolve,0,0,0,0);}
     52:     if (mglevels[i+1]->eventinterprestrict) {PetscLogEventBegin(mglevels[i+1]->eventinterprestrict,0,0,0,0);}
     53:     MatInterpolate(mglevels[i+1]->interpolate,mglevels[i]->x,mglevels[i+1]->x);
     54:     if (mglevels[i+1]->eventinterprestrict) {PetscLogEventEnd(mglevels[i+1]->eventinterprestrict,0,0,0,0);}
     55:   }
     56:   if (mglevels[l-1]->eventsmoothsolve) {PetscLogEventBegin(mglevels[l-1]->eventsmoothsolve,0,0,0,0);}
     57:   KSPSolve(mglevels[l-1]->smoothd,mglevels[l-1]->b,mglevels[l-1]->x);
     58:   if (mglevels[l-1]->eventsmoothsolve) {PetscLogEventEnd(mglevels[l-1]->eventsmoothsolve,0,0,0,0);}
     59:   return(0);
     60: }