Actual source code: pcgamgimpl.h

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

      8: struct _PCGAMGOps {
      9:   PetscErrorCode (*graph)(PC, Mat, Mat*);
     10:   PetscErrorCode (*coarsen)(PC, Mat*, PetscCoarsenData**);
     11:   PetscErrorCode (*prolongator)(PC, Mat, Mat, PetscCoarsenData*, Mat*);
     12:   PetscErrorCode (*optprolongator)(PC, Mat, Mat*);
     13:   PetscErrorCode (*createlevel)(PC, Mat, PetscInt, Mat *, Mat *, PetscMPIInt *, IS *, PetscBool);
     14:   PetscErrorCode (*createdefaultdata)(PC, Mat); /* for data methods that have a default (SA) */
     15:   PetscErrorCode (*setfromoptions)(PetscOptionItems*,PC);
     16:   PetscErrorCode (*destroy)(PC);
     17:   PetscErrorCode (*view)(PC,PetscViewer);
     18: };
     19: /* Private context for the GAMG preconditioner */
     20: typedef struct gamg_TAG {
     21:   PCGAMGType type;
     22:   PetscInt  Nlevels;
     23:   PetscBool repart;
     24:   PetscBool reuse_prol;
     25:   PetscBool use_aggs_in_asm;
     26:   PetscBool use_parallel_coarse_grid_solver;
     27:   PCGAMGLayoutType layout_type;
     28:   PetscBool cpu_pin_coarse_grids;
     29:   PetscInt  min_eq_proc;
     30:   PetscInt  coarse_eq_limit;
     31:   PetscReal threshold_scale;
     32:   PetscReal threshold[PETSC_MG_MAXLEVELS]; /* common quatity to many AMG methods so keep it up here */
     33:   PetscInt  level_reduction_factors[PETSC_MG_MAXLEVELS];
     34:   PetscInt  current_level; /* stash construction state */
     35:   /* these 4 are all related to the method data and should be in the subctx */
     36:   PetscInt  data_sz;      /* nloc*data_rows*data_cols */
     37:   PetscInt  data_cell_rows;
     38:   PetscInt  data_cell_cols;
     39:   PetscInt  orig_data_cell_rows;
     40:   PetscInt  orig_data_cell_cols;
     41:   PetscReal *data;          /* [data_sz] blocked vector of vertex data on fine grid (coordinates/nullspace) */
     42:   PetscReal *orig_data;          /* cache data */

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

     47:   void      *subctx;

     49:   char       esteig_type[32];
     50:   PetscInt   esteig_max_it;
     51:   PetscInt   use_sa_esteig;
     52:   PetscReal  emin,emax;
     53: } PC_GAMG;

     55: PetscErrorCode PCReset_MG(PC);

     57: /* hooks create derivied classes */
     58: PetscErrorCode PCCreateGAMG_GEO(PC);
     59: PetscErrorCode PCCreateGAMG_AGG(PC);
     60: PetscErrorCode PCCreateGAMG_Classical(PC);

     62: PetscErrorCode PCDestroy_GAMG(PC);

     64: /* helper methods */
     65: PetscErrorCode PCGAMGCreateGraph(Mat, Mat*);
     66: PetscErrorCode PCGAMGFilterGraph(Mat*, PetscReal, PetscBool);
     67: PetscErrorCode PCGAMGGetDataWithGhosts(Mat, PetscInt, PetscReal[],PetscInt*, PetscReal **);

     69: 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};
     70: PETSC_EXTERN PetscLogEvent petsc_gamg_setup_events[NUM_SET];
     71: PETSC_EXTERN PetscLogEvent PC_GAMGGraph_AGG;
     72: PETSC_EXTERN PetscLogEvent PC_GAMGGraph_GEO;
     73: PETSC_EXTERN PetscLogEvent PC_GAMGCoarsen_AGG;
     74: PETSC_EXTERN PetscLogEvent PC_GAMGCoarsen_GEO;
     75: PETSC_EXTERN PetscLogEvent PC_GAMGProlongator_AGG;
     76: PETSC_EXTERN PetscLogEvent PC_GAMGProlongator_GEO;
     77: PETSC_EXTERN PetscLogEvent PC_GAMGOptProlongator_AGG;
     78: PETSC_EXTERN PetscLogEvent petsc_gamg_setup_matmat_events[PETSC_MG_MAXLEVELS][3];

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

     87: PETSC_INTERN PetscErrorCode PCGAMGHashTableCreate(PetscInt, PCGAMGHashTable*);
     88: PETSC_INTERN PetscErrorCode PCGAMGHashTableDestroy(PCGAMGHashTable*);
     89: PETSC_INTERN PetscErrorCode PCGAMGHashTableAdd(PCGAMGHashTable*,PetscInt,PetscInt);

     91: #define GAMG_HASH(key) (PetscInt)((((PetscInt64)7)*(PetscInt64)key)%(PetscInt64)a_tab->size)
     92: PETSC_STATIC_INLINE PetscErrorCode PCGAMGHashTableFind(PCGAMGHashTable *a_tab, PetscInt a_key, PetscInt *a_data)
     93: {
     94:   PetscInt kk,idx;

     97:   if (a_key<0) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_USER,"Negative key %D.",a_key);
     98:   for (kk = 0, idx = GAMG_HASH(a_key); kk < a_tab->size; kk++, idx = (idx==(a_tab->size-1)) ? 0 : idx + 1) {
     99:     if (a_tab->table[idx] == a_key) {
    100:       *a_data = a_tab->data[idx];
    101:       break;
    102:     } else if (a_tab->table[idx] == -1) {
    103:       /* not here */
    104:       *a_data = -1;
    105:       break;
    106:     }
    107:   }
    108:   if (kk==a_tab->size) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_USER,"key %D not found in table",a_key);
    109:   return(0);
    110: }

    112: #endif