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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"
static void dtime(double *t);
static int rnd(int numprocs);
int main(int argc, char *argv[])
{
int numprocs,myid,ID;
int i,NN;
int *Num_Snd,*Num_Rcv;
double **SndA;
double **RcvA;
double TStime,TEtime;
double sum;
MPI_Status stat;
MPI_Request request;
MPI_Init(&argc,&argv);
MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
MPI_Comm_rank(MPI_COMM_WORLD,&myid);
NN = 3;
/* allocation of arrays */
Num_Snd = (int*)malloc(sizeof(int)*numprocs);
Num_Rcv = (int*)malloc(sizeof(int)*numprocs);
/* set data */
for (ID=0; ID<numprocs; ID++){
Num_Snd[ID] = 0;
Num_Rcv[ID] = 0;
}
for (i=0; i<NN; i++){
printf("%3d\n",rnd(numprocs));
}
/*
First case:
MPI_Isend and MPI_Recv
*/
/*
Second case:
MPI_Isend and MPI_Irecv
*/
/*
SndA = (double**)malloc(sizeof(double*)*numprocs);
for (i=0; i<numprocs; i++){
SndA[i] = (double*)malloc(sizeof(double)*asize1);
}
RcvA = (double**)malloc(sizeof(double*)*numprocs);
for (i=0; i<numprocs; i++){
RcvA[i] = (double*)malloc(sizeof(double)*asize1);
}
printf("numprocs=%2d myid=%2d\n",numprocs,myid);
for (i=0; i<asize1; i++){
SndA[myid][i] = cos((double)myid*(double)i);
}
tag = 999;
MPI_Barrier(mpi_comm_level1);
dtime(&TStime);
*/
/*
for (ID=0; ID<numprocs; ID++){
if (ID!=myid){
MPI_Isend(&SndA[myid][0], asize1, MPI_DOUBLE, ID, tag, mpi_comm_level1, &request);
MPI_Recv( &RcvA[ID][0], asize1, MPI_DOUBLE, ID, tag, mpi_comm_level1, &stat);
MPI_Wait(&request,&stat);
}
}
*/
/*
for (ID=0; ID<numprocs; ID++){
if (ID!=myid){
MPI_Isend(&SndA[myid][0], asize1, MPI_DOUBLE, ID, tag, mpi_comm_level1, &request);
}
}
for (ID=0; ID<numprocs; ID++){
if (ID!=myid){
MPI_Recv( &RcvA[ID][0], asize1, MPI_DOUBLE, ID, tag, mpi_comm_level1, &stat);
}
}
MPI_Wait(&request,&stat);
MPI_Barrier(mpi_comm_level1);
dtime(&TEtime);
sum = 0.0;
for (i=0; i<asize1; i++){
sum += RcvA[1][i];
}
printf("myid=%2d elapsed time = %15.10f sum=%15.12f\n",myid,TEtime-TStime,sum);
*/
MPI_Finalize();
}
void dtime(double *t)
{
// real time
struct timeval timev;
gettimeofday(&timev, NULL);
*t = timev.tv_sec + (double)timev.tv_usec*1e-6;
}
int rnd(int numprocs)
{
double result;
result = rand();
while (2.0<result){
result = result/2.0;
}
return (int)result;
}
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