Actual source code: smg.c
petsc-3.7.1 2016-05-15
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      2: /*
      3:      Additive Multigrid V Cycle routine
      4: */
      5: #include <petsc/private/pcmgimpl.h>

      9: PetscErrorCode PCMGACycle_Private(PC pc,PC_MG_Levels **mglevels)
     10: {
     12:   PetscInt       i,l = mglevels[0]->levels;

     15:   /* compute RHS on each level */
     16:   for (i=l-1; i>0; i--) {
     17:     if (mglevels[i]->eventinterprestrict) {PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0);}
     18:     MatRestrict(mglevels[i]->restrct,mglevels[i]->b,mglevels[i-1]->b);
     19:     if (mglevels[i]->eventinterprestrict) {PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0);}
     20:   }
     21:   /* solve separately on each level */
     22:   for (i=0; i<l; i++) {
     23:     VecSet(mglevels[i]->x,0.0);
     24:     if (mglevels[i]->eventsmoothsolve) {PetscLogEventBegin(mglevels[i]->eventsmoothsolve,0,0,0,0);}
     25:     KSPSolve(mglevels[i]->smoothd,mglevels[i]->b,mglevels[i]->x);
     26:     if (mglevels[i]->eventsmoothsolve) {PetscLogEventEnd(mglevels[i]->eventsmoothsolve,0,0,0,0);}
     27:   }
     28:   for (i=1; i<l; i++) {
     29:     if (mglevels[i]->eventinterprestrict) {PetscLogEventBegin(mglevels[i]->eventinterprestrict,0,0,0,0);}
     30:     MatInterpolateAdd(mglevels[i]->interpolate,mglevels[i-1]->x,mglevels[i]->x,mglevels[i]->x);
     31:     if (mglevels[i]->eventinterprestrict) {PetscLogEventEnd(mglevels[i]->eventinterprestrict,0,0,0,0);}
     32:   }
     33:   return(0);
     34: }