Actual source code: petscelemental.h

      1: #pragma once

      3: #include <petsc/private/matimpl.h>
      4: #include <petscmatelemental.h>

      6: typedef struct {
      7:   PetscInt                         commsize;
      8:   PetscInt                         m[2];  /* Number of entries in a local block of the row (column) space */
      9:   PetscInt                         mr[2]; /* First incomplete/ragged rank of (row) column space.
     10:                           We expose a blocked ordering to the user because that is what all other PETSc infrastructure uses.
     11:                           With the blocked ordering when the number of processes do not evenly divide the vector size,
     12:                           we still need to be able to convert from PETSc/blocked ordering to VC/VR ordering. */
     13:   El::Grid                        *grid;
     14:   El::DistMatrix<PetscElemScalar> *emat;
     15:   PetscInt                         pivoting; /* 0: no pivoting; 1: partial pivoting; 2: full pivoting */
     16:   El::DistPermutation             *P, *Q;
     17:   PetscBool                        roworiented; /* if true, row-oriented input (default) */
     18: } Mat_Elemental;

     20: typedef struct {
     21:   El::Grid *grid;
     22:   PetscInt  grid_refct;
     23: } Mat_Elemental_Grid;

     25: PETSC_INTERN PetscErrorCode MatMatMultSymbolic_Elemental(Mat, Mat, PetscReal, Mat);
     26: PETSC_INTERN PetscErrorCode MatMatMultNumeric_Elemental(Mat, Mat, Mat);

     28: /*
     29:  P2RO, RO2P, E2RO and RO2E convert indices between PETSc <-> (Rank,Offset) <-> Elemental
     30:  (PETSc parallel vectors can be used with Elemental matries without changes)
     31: */
     32: static inline void P2RO(Mat A, PetscInt rc, PetscInt p, PetscInt *rank, PetscInt *offset)
     33: {
     34:   Mat_Elemental *a        = (Mat_Elemental *)A->data;
     35:   PetscInt       critical = a->m[rc] * a->mr[rc];
     36:   if (p < critical) {
     37:     *rank   = p / a->m[rc];
     38:     *offset = p % a->m[rc];
     39:   } else {
     40:     *rank   = a->mr[rc] + (p - critical) / (a->m[rc] - 1);
     41:     *offset = (p - critical) % (a->m[rc] - 1);
     42:   }
     43: }
     44: static inline void RO2P(Mat A, PetscInt rc, PetscInt rank, PetscInt offset, PetscInt *p)
     45: {
     46:   Mat_Elemental *a = (Mat_Elemental *)A->data;
     47:   if (rank < a->mr[rc]) {
     48:     *p = rank * a->m[rc] + offset;
     49:   } else {
     50:     *p = a->mr[rc] * a->m[rc] + (rank - a->mr[rc]) * (a->m[rc] - 1) + offset;
     51:   }
     52: }

     54: static inline void E2RO(Mat A, PetscInt, PetscInt p, PetscInt *rank, PetscInt *offset)
     55: {
     56:   Mat_Elemental *a = (Mat_Elemental *)A->data;
     57:   *rank            = p % a->commsize;
     58:   *offset          = p / a->commsize;
     59: }
     60: static inline void RO2E(Mat A, PetscInt, PetscInt rank, PetscInt offset, PetscInt *e)
     61: {
     62:   Mat_Elemental *a = (Mat_Elemental *)A->data;
     63:   *e               = offset * a->commsize + rank;
     64: }