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Add create large array for broadcast #157

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Feb 15, 2024
Merged

Add create large array for broadcast #157

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1 change: 1 addition & 0 deletions SRC/include/superlu_defs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1305,6 +1305,7 @@ extern SupernodeToGridMap_t* createSuperGridMap(int_t nsuper,int_t maxLvl, int_t
int_t *myZeroTrIdxs, int_t* gNodeCount, int_t** gNodeLists);
extern int_t *createSupernode2TreeMap(int_t nsupers, int_t maxLvl, int_t *gNodeCount, int_t **gNodeLists);
extern void allocBcastArray(void **array, int_t size, int root, MPI_Comm comm);
extern void allocBcastLargeArray(void **array, int64_t size, int root, MPI_Comm comm);
extern int_t* create_iperm_c_supno(int_t nsupers, superlu_dist_options_t *options, Glu_persist_t *Glu_persist, int_t *etree, int_t** Lrowind_bc_ptr, int_t** Ufstnz_br_ptr, gridinfo3d_t *grid3d);
extern gEtreeInfo_t fillEtreeInfo( int_t nsupers, int_t* setree, treeList_t *treeList);
extern sForest_t **compute_sForests(int_t nsupers, Glu_persist_t *Glu_persist, int_t *etree, gridinfo3d_t *grid3d);
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38 changes: 38 additions & 0 deletions SRC/prec-independent/trfAux.c
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Expand Up @@ -2714,6 +2714,44 @@ void allocBcastArray(void **array, int_t size, int root, MPI_Comm comm)
MPI_Bcast(*array, size, MPI_BYTE, root, comm);
}

void allocBcastLargeArray(void **array, int64_t size, int root, MPI_Comm comm)
{
int rank;
MPI_Comm_rank(comm, &rank); // Get the rank of the current process

// Check if the size is valid
if (rank == root)
{
if (size <= 0)
{
fprintf(stderr, "Entered large array allocation. Error: Size should be a positive integer.\n");
MPI_Abort(comm, EXIT_FAILURE);
}

}

// Send the size from root to all other processes in the communicator
MPI_Bcast(&size, 1, MPI_INT64_T, root, comm);

// If I am not the root, receive the size from the root and allocate the array
if (rank != root)
{
*array = SUPERLU_MALLOC(size);
if (*array == NULL)
{
fprintf(stderr, "Error: Failed to allocate memory.\n");
MPI_Abort(comm, EXIT_FAILURE);
}
}

// Then broadcast the array from the root to all other processes
int chunk = size / INT_MAX;
for (int i = 0; i < chunk; i++) {
MPI_Bcast(&((*array)[i*INT_MAX]), INT_MAX, MPI_BYTE, root, comm);
}
MPI_Bcast(&((*array)[chunk*INT_MAX]), size-chunk*INT_MAX, MPI_BYTE, root, comm);
}

sForest_t **compute_sForests(int_t nsupers, Glu_persist_t *Glu_persist, int_t *etree, gridinfo3d_t *grid3d)
{
// Calculation of supernodal etree
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