GetOwnershipBoundariesFromRange.cpp File Reference

from a local range on each cpu, we determine what lower row and upper row from a matrix a cpu owns. More...

#include <stdio.h>
#include "../../../shared/MemOps/MemOps.h"
#include "../../../shared/io/Comm/IssmComm.h"

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Functions
void	GetOwnershipBoundariesFromRange (int *plower_row, int *pupper_row, int range, ISSM_MPI_Comm comm)

Detailed Description

from a local range on each cpu, we determine what lower row and upper row from a matrix a cpu owns.

Definition in file GetOwnershipBoundariesFromRange.cpp.

Function Documentation

GetOwnershipBoundariesFromRange()

void GetOwnershipBoundariesFromRange	(	int *	plower_row,
		int *	pupper_row,
		int	range,
		ISSM_MPI_Comm	comm
	)

Definition at line 16 of file GetOwnershipBoundariesFromRange.cpp.

                                                                                                  {
 
   /*externals :*/
   int my_rank;
   int num_procs;
 
   /*recover my_rank and num_procs:*/
   ISSM_MPI_Comm_size(comm,&num_procs);
   ISSM_MPI_Comm_rank(comm,&my_rank);
 
   /*output: */
   int lower_row,upper_row;
 
   /*Gather all range values into allranges, for all nodes*/
   int* allranges=xNew<int>(num_procs);
   ISSM_MPI_Allgather(&range,1,ISSM_MPI_INT,allranges,1,ISSM_MPI_INT,comm);
 
   /*From all ranges, get lower row and upper row*/
   lower_row=0;
   upper_row=lower_row+allranges[0];
   for(int i=1;i<=my_rank;i++){
      lower_row=lower_row+allranges[i-1];
      upper_row=upper_row+allranges[i];
   }
 
   /*Assign output*/
   *plower_row=lower_row;
   *pupper_row=upper_row;
   xDelete<int>(allranges);
}