3:  #include <petsc/private/pcimpl.h>
  4:  #include <petsc/private/pcmgimpl.h>
  5:  #include <petscmatcoarsen.h>

  7: struct _PCGAMGOps {
  8:   PetscErrorCode (*graph)(PC, Mat, Mat*);
  9:   PetscErrorCode (*coarsen)(PC, Mat*, PetscCoarsenData**);
 10:   PetscErrorCode (*prolongator)(PC, Mat, Mat, PetscCoarsenData*, Mat*);
 11:   PetscErrorCode (*optprolongator)(PC, Mat, Mat*);
 12:   PetscErrorCode (*createlevel)(PC, Mat, PetscInt, Mat *, Mat *, PetscMPIInt *, IS *, PetscBool);
 13:   PetscErrorCode (*createdefaultdata)(PC, Mat); /* for data methods that have a default (SA) */
 14:   PetscErrorCode (*setfromoptions)(PetscOptionItems*,PC);
 15:   PetscErrorCode (*destroy)(PC);
 16:   PetscErrorCode (*view)(PC,PetscViewer);
 17: };
 18: #define PETSC_GAMG_MAXLEVELS 30
 19: /* Private context for the GAMG preconditioner */
 20: typedef struct gamg_TAG {
 21:   PCGAMGType type;
 22:   PetscInt  Nlevels;
 23:   PetscInt  setup_count;
 24:   PetscBool repart;
 25:   PetscBool reuse_prol;
 26:   PetscBool use_aggs_in_asm;
 27:   PetscBool use_parallel_coarse_grid_solver;
 28:   PetscInt  min_eq_proc;
 29:   PetscInt  coarse_eq_limit;
 30:   PetscReal threshold_scale;
 31:   PetscInt  current_level; /* stash construction state */
 32:   PetscReal threshold[PETSC_GAMG_MAXLEVELS]; /* common quatity to many AMG methods so keep it up here */

 34:   /* these 4 are all related to the method data and should be in the subctx */
 35:   PetscInt  data_sz;      /* nloc*data_rows*data_cols */
 36:   PetscInt  data_cell_rows;
 37:   PetscInt  data_cell_cols;
 38:   PetscInt  orig_data_cell_rows;
 39:   PetscInt  orig_data_cell_cols;
 40:   PetscReal *data;          /* [data_sz] blocked vector of vertex data on fine grid (coordinates/nullspace) */
 41:   PetscReal *orig_data;          /* cache data */

 43:   struct _PCGAMGOps *ops;
 44:   char *gamg_type_name;

 46:   void *subctx;
 47: } PC_GAMG;

 49: PetscErrorCode PCReset_MG(PC);

 51: /* hooks create derivied classes */
 52: PetscErrorCode  PCCreateGAMG_GEO(PC);
 53: PetscErrorCode  PCCreateGAMG_AGG(PC);
 54: PetscErrorCode  PCCreateGAMG_Classical(PC);

 56: PetscErrorCode PCDestroy_GAMG(PC);

 58: /* helper methods */
 59: PetscErrorCode PCGAMGCreateGraph(Mat, Mat*);
 60: PetscErrorCode PCGAMGFilterGraph(Mat*, PetscReal, PetscBool);
 61: PetscErrorCode PCGAMGGetDataWithGhosts(Mat, PetscInt, PetscReal[],PetscInt*, PetscReal **);

 63: #if defined PETSC_USE_LOG
 64: #define PETSC_GAMG_USE_LOG
 65: enum tag {SET1,SET2,GRAPH,GRAPH_MAT,GRAPH_FILTER,GRAPH_SQR,SET4,SET5,SET6,FIND_V,SET7,SET8,SET9,SET10,SET11,SET12,SET13,SET14,SET15,SET16,NUM_SET};
 66: #if defined PETSC_GAMG_USE_LOG
 67: PETSC_EXTERN PetscLogEvent petsc_gamg_setup_events[NUM_SET];
 68: #endif
 69: PETSC_EXTERN PetscLogEvent PC_GAMGGraph_AGG;
 70: PETSC_EXTERN PetscLogEvent PC_GAMGGraph_GEO;
 71: PETSC_EXTERN PetscLogEvent PC_GAMGCoarsen_AGG;
 72: PETSC_EXTERN PetscLogEvent PC_GAMGCoarsen_GEO;
 73: PETSC_EXTERN PetscLogEvent PC_GAMGProlongator_AGG;
 74: PETSC_EXTERN PetscLogEvent PC_GAMGProlongator_GEO;
 75: PETSC_EXTERN PetscLogEvent PC_GAMGOptProlongator_AGG;
 76: #endif

 78: typedef struct _PCGAMGHashTable {
 79:   PetscInt *table;
 80:   PetscInt *data;
 81:   PetscInt size;
 82: } PCGAMGHashTable;


 85: PETSC_INTERN PetscErrorCode PCGAMGHashTableCreate(PetscInt, PCGAMGHashTable*);
 86: PETSC_INTERN PetscErrorCode PCGAMGHashTableDestroy(PCGAMGHashTable*);
 87: PETSC_INTERN PetscErrorCode PCGAMGHashTableAdd(PCGAMGHashTable*,PetscInt,PetscInt);

 89: #define GAMG_HASH(key) ((((PetscInt)7)*key)%a_tab->size)
 90: PETSC_STATIC_INLINE PetscErrorCode PCGAMGHashTableFind(PCGAMGHashTable *a_tab, PetscInt a_key, PetscInt *a_data)
 91: {
 92:   PetscInt kk,idx;

 95:   if (a_key<0) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_USER,"Negative key %d.",a_key);
 96:   for (kk = 0, idx = GAMG_HASH(a_key); kk < a_tab->size; kk++, idx = (idx==(a_tab->size-1)) ? 0 : idx + 1) {
 97:     if (a_tab->table[idx] == a_key) {
 98:       *a_data = a_tab->data[idx];
 99:       break;
100:     } else if (a_tab->table[idx] == -1) {
101:       /* not here */
102:       *a_data = -1;
103:       break;
104:     }
105:   }
106:   if (kk==a_tab->size) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_USER,"key %d not found in table",a_key);
107:   return(0);
108: }

110: #endif