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/*
cc -o crisscross crisscross.c -lmpi
*/
#include <stdio.h>
#include <stdlib.h>
#include "mpi.h"
#include <unistd.h>
#include <string.h>
#include <time.h>
#define MAX_RR_NAME 7
int main(int argc, char *argv[])
{
MPI_Status status; /* MPI status */
int mpierr; /* MPI function return code */
int rank; /* Process rank within MPI_COMM_WORLD */
int nproc; /* Total number of MPI processes */
int tag0=41; /* MPI message tag */
int tag1=42; /* MPI message tag */
int tag2=43; /* MPI message tag */
int warmup=1; /* MPI warmup loops */
char process_name[MPI_MAX_PROCESSOR_NAME + 1];
char partner_name[MPI_MAX_PROCESSOR_NAME + 1];
char rr_blank[] = {" "};
char rr_empty[] = {"???????"};
int n_bytes=128*1024*1024;
int n_loops=2;
unsigned char* send_buff;
unsigned char* recv_buff;
int i,j,k,m,count,mismatch;
double et1,et2,mbs;
double avg_mbs=0, sum_avg_mbs=0;
int xfers=0, sum_xfers=0;
double max_mbs=-1.0,min_mbs=999999.9;
double r_max_mbs,r_min_mbs;
time_t curtime;
struct tm *loctime;
if ( argc > 2 )
{
n_loops = atoi(argv[2]);
n_loops = n_loops < 1 ? 10 : n_loops;
}
if ( argc > 1 )
{
n_bytes = atoi(argv[1]);
n_bytes = n_bytes < 1 ? 32768 : n_bytes;
}
send_buff = (unsigned char *) valloc(n_bytes);
recv_buff = (unsigned char *) valloc(n_bytes);
for ( i=0; i<n_bytes; i++ )
{
send_buff[i] = i%128;
}
mpierr = MPI_Init(&argc, &argv);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr, "MPI Error %d (MPI_Init)\n",mpierr);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
mpierr = MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if (mpierr != MPI_SUCCESS || rank < 0)
{
fprintf(stderr, "MPI Error %d (MPI_Comm_rank)\n",mpierr);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
if ( rank == 0 )
{
curtime = time (NULL);
loctime = localtime (&curtime);
printf("\n %s\n",asctime (loctime));
}
mpierr = MPI_Comm_size(MPI_COMM_WORLD, &nproc);
if (mpierr != MPI_SUCCESS || nproc < 1 || nproc <= rank)
{
fprintf(stderr, "MPI Error %d (MPI_Comm_size) [%d]\n",mpierr, rank);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
mpierr = MPI_Get_processor_name(process_name, &count);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Get_processor_name) [%d]\n", mpierr, rank);
sprintf(process_name, "%s", rr_empty);
}
else
{
if (count < MAX_RR_NAME) strncat(&process_name[count],rr_blank,MAX_RR_NAME-count);
process_name[MAX_RR_NAME] = '\0';
}
for ( i=0; i<nproc; i++ )
{
mpierr = MPI_Barrier(MPI_COMM_WORLD);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr, "MPI Error %d (MPI_Barrier) [%d]\n", mpierr, rank);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
for ( j=0; j<nproc; j++ )
{
if ( i != j )
{
if (rank == j)
{
mpierr = MPI_Sendrecv(process_name, MPI_MAX_PROCESSOR_NAME + 1, MPI_CHAR, i, tag0,
partner_name, MPI_MAX_PROCESSOR_NAME + 1, MPI_CHAR, i, tag0, MPI_COMM_WORLD, &status);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Sendrecv) %s [%d,%d]\n",mpierr,process_name,rank,i);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
for ( k=0; k<n_bytes; k++ )
{
recv_buff[k] = 0x80;
}
}
if ( rank == i )
{
mpierr = MPI_Sendrecv(process_name, MPI_MAX_PROCESSOR_NAME + 1, MPI_CHAR, j, tag0,
partner_name, MPI_MAX_PROCESSOR_NAME + 1, MPI_CHAR, j, tag0, MPI_COMM_WORLD, &status);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Sendrecv) %s [%d,%d]\n",mpierr,process_name,i,j);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
}
for ( k=0; k<n_loops+warmup; k++ )
{
if ( rank == i )
{
if (k == warmup) et1 = MPI_Wtime();
mpierr = MPI_Send(send_buff, n_bytes, MPI_BYTE, j, tag1, MPI_COMM_WORLD);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Send) %s [4%d] --> %s [4%d]\n",mpierr,process_name,i,partner_name,j);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
}
if ( rank == j )
{
mpierr = MPI_Recv(recv_buff, n_bytes, MPI_BYTE, i, tag1, MPI_COMM_WORLD, &status);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Recv) %s [4%d] <-- %s [4%d]\n",mpierr,process_name,j,partner_name,i);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
if (k == n_loops+warmup-1) et2 = MPI_Wtime();
}
}
if ( rank == i )
{
mpierr = MPI_Send(&et1, 1, MPI_DOUBLE, j, tag1, MPI_COMM_WORLD);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Send) %s [4%d] --> %s [4%d]\n",mpierr,process_name,i,partner_name,j);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
}
if ( rank == j )
{
mpierr = MPI_Recv(&et1, 1, MPI_DOUBLE, i, tag1, MPI_COMM_WORLD, &status);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Recv) %s [4%d] <-- %s [4%d]\n",mpierr,process_name,j,partner_name,i);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
mbs = ((double)n_loops*n_bytes)/(1000000.0*(et2-et1));
if (mbs < 50.0)
{
printf(" %s [%4d] =====>> %s [%4d] %9.1f mbs SLOW!\n",partner_name,i,process_name,j,mbs);
}
else
{
printf(" %s [%4d] =====>> %s [%4d] %9.1f mbs\n",partner_name,i,process_name,j,mbs);
}
min_mbs = (mbs < min_mbs) ? mbs:min_mbs;
max_mbs = (mbs > max_mbs) ? mbs:max_mbs;
avg_mbs += mbs;
xfers++;
mismatch = 0;
for ( k=0; k<n_bytes; k++ )
{
if ( recv_buff[k] != k%128 ) mismatch++;
}
if ( mismatch ) printf(" WARNING! %d data mismatches\n",mismatch);
fflush(stdout);
}
}
}
}
mpierr = MPI_Reduce(&xfers, &sum_xfers, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Reduce) %s [%d]\n",mpierr,process_name,rank);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
mpierr = MPI_Reduce(&avg_mbs, &sum_avg_mbs, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Reduce) %s [%d]\n",mpierr,process_name,rank);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
mpierr = MPI_Reduce(&min_mbs, &r_min_mbs, 1, MPI_DOUBLE, MPI_MIN, 0, MPI_COMM_WORLD);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Reduce) %s [%d]\n",mpierr,process_name,rank);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
mpierr = MPI_Reduce(&max_mbs, &r_max_mbs, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Reduce) %s [%d]\n",mpierr,process_name,rank);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
mpierr = MPI_Finalize();
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Finalize) %s [%d]\n",mpierr,process_name,rank);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
fflush(stdout);
if ( rank == 0 )
{
mbs = sum_avg_mbs/sum_xfers;
printf("\n average tranfer rate for %d transfers: %9.1f mbs\n",sum_xfers, mbs);
printf(" minimum tranfer rate for %d transfers: %9.1f mbs\n",sum_xfers, r_min_mbs);
printf(" maximum tranfer rate for %d transfers: %9.1f mbs\n",sum_xfers, r_max_mbs);
fflush(stdout);
}
return 0;
}
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