Actual source code: fmg.c
petsc-3.7.1 2016-05-15
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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*);

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

     16:   /* restrict the RHS through all levels to coarsest. */
     17:   for (i=l-1; i>0; i--) {
     18:     if (mglevels[i]->eventinterprestrict) {PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0);}
     19:     MatRestrict(mglevels[i]->restrct,mglevels[i]->b,mglevels[i-1]->b);
     20:     if (mglevels[i]->eventinterprestrict) {PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0);}
     21:   }

     23:   /* work our way up through the levels */
     24:   VecSet(mglevels[0]->x,0.0);
     25:   for (i=0; i<l-1; i++) {
     26:     PCMGMCycle_Private(pc,&mglevels[i],NULL);
     27:     if (mglevels[i+1]->eventinterprestrict) {PetscLogEventBegin(mglevels[i+1]->eventinterprestrict,0,0,0,0);}
     28:     MatInterpolate(mglevels[i+1]->interpolate,mglevels[i]->x,mglevels[i+1]->x);
     29:     if (mglevels[i+1]->eventinterprestrict) {PetscLogEventEnd(mglevels[i+1]->eventinterprestrict,0,0,0,0);}
     30:   }
     31:   PCMGMCycle_Private(pc,&mglevels[l-1],NULL);
     32:   return(0);
     33: }

     37: PetscErrorCode PCMGKCycle_Private(PC pc,PC_MG_Levels **mglevels)
     38: {
     40:   PetscInt       i,l = mglevels[0]->levels;

     43:   /* restrict the RHS through all levels to coarsest. */
     44:   for (i=l-1; i>0; i--) {
     45:     if (mglevels[i]->eventinterprestrict) {PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0);}
     46:     MatRestrict(mglevels[i]->restrct,mglevels[i]->b,mglevels[i-1]->b);
     47:     if (mglevels[i]->eventinterprestrict) {PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0);}
     48:   }

     50:   /* work our way up through the levels */
     51:   VecSet(mglevels[0]->x,0.0);
     52:   for (i=0; i<l-1; i++) {
     53:     if (mglevels[i]->eventsmoothsolve) {PetscLogEventBegin(mglevels[i]->eventsmoothsolve,0,0,0,0);}
     54:     KSPSolve(mglevels[i]->smoothd,mglevels[i]->b,mglevels[i]->x);
     55:     if (mglevels[i]->eventsmoothsolve) {PetscLogEventEnd(mglevels[i]->eventsmoothsolve,0,0,0,0);}
     56:     if (mglevels[i+1]->eventinterprestrict) {PetscLogEventBegin(mglevels[i+1]->eventinterprestrict,0,0,0,0);}
     57:     MatInterpolate(mglevels[i+1]->interpolate,mglevels[i]->x,mglevels[i+1]->x);
     58:     if (mglevels[i+1]->eventinterprestrict) {PetscLogEventEnd(mglevels[i+1]->eventinterprestrict,0,0,0,0);}
     59:   }
     60:   if (mglevels[l-1]->eventsmoothsolve) {PetscLogEventBegin(mglevels[l-1]->eventsmoothsolve,0,0,0,0);}
     61:   KSPSolve(mglevels[l-1]->smoothd,mglevels[l-1]->b,mglevels[l-1]->x);
     62:   if (mglevels[l-1]->eventsmoothsolve) {PetscLogEventEnd(mglevels[l-1]->eventsmoothsolve,0,0,0,0);}
     63:   return(0);
     64: }