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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/times.h>
#include "mpi.h"
#include "openmx_common.h"
#define asize1 819200 // 819200
static void dtime(double *t);
int main(int argc, char *argv[])
{
int numprocs,myid,ID,count,tag,i,j,k;
double *SndA;
double *RcvA;
double TStime,TEtime;
MPI_Status stat;
MPI_Request request;
MPI_Init(&argc,&argv);
MPI_Comm_size(mpi_comm_level1,&numprocs);
MPI_Comm_rank(mpi_comm_level1,&myid);
SndA = (double*)malloc(sizeof(double)*asize1);
RcvA = (double*)malloc(sizeof(double)*asize1);
printf("numprocs=%2d myid=%2d\n",numprocs,myid);
tag = 999;
MPI_Barrier(mpi_comm_level1);
dtime(&TStime);
for (ID=0; ID<numprocs; ID++){
if (ID!=myid){
MPI_Isend(&SndA[0], asize1, MPI_DOUBLE, ID, tag, mpi_comm_level1, &request);
MPI_Recv( &RcvA[0], asize1, MPI_DOUBLE, ID, tag, mpi_comm_level1, &stat);
MPI_Wait(&request,&stat);
}
}
MPI_Barrier(mpi_comm_level1);
dtime(&TEtime);
printf("elapsed time = %15.10f\n",TEtime-TStime);
MPI_Finalize();
}
void dtime(double *t)
{
// real time
struct timeval timev;
gettimeofday(&timev, NULL);
*t = timev.tv_sec + (double)timev.tv_usec*1e-6;
}
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