utils.c File Reference

#include <stdlib.h>
#include "petsc.h"
#include "anamodutils.h"

Include dependency graph for utils.c:

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Functions

int MPIAllGatherIntV (int *array, int n, int **Array, int *N, MPI_Comm comm)


Detailed Description

Definition in file utils.c.


Function Documentation

int MPIAllGatherIntV ( int *  array,
int  n,
int **  Array,
int *  N,
MPI_Comm  comm 
)

Definition at line 8 of file utils.c.

Referenced by GetUpBiDiagSplits(), and MatSplitPoints().

00009 {
00010   int *sizes,*offsets,*result_array,ntids,i,ierr,s;
00011 
00012   PetscFunctionBegin;
00013   MPI_Comm_size(comm,&ntids);
00014   ierr = PetscMalloc(ntids*sizeof(int),&sizes); CHKERRQ(ierr);
00015   ierr = PetscMalloc(ntids*sizeof(int),&offsets); CHKERRQ(ierr);
00016   MPI_Allgather(&n,1,MPI_INT,sizes,1,MPI_INT,comm);
00017   s=0; for (i=0; i<ntids; i++) {offsets[i]=s; s+=sizes[i];} *N = s;
00018   ierr = PetscMalloc((*N+1)*sizeof(int),&result_array); CHKERRQ(ierr);
00019   result_array[0] = *N;
00020   ierr = MPI_Allgatherv
00021     ((void*)array,n,MPI_INT,(void*)(result_array+1),
00022      sizes,offsets,MPI_INT,comm); CHKERRQ(ierr);
00023   ierr = PetscFree(sizes); CHKERRQ(ierr);
00024   ierr = PetscFree(offsets); CHKERRQ(ierr);
00025   *Array = result_array;
00026 
00027   PetscFunctionReturn(0);
00028 }


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