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mpi-ping.c
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mpi-ping.c
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/*
* MPI ping program
*
* Patterned after the example in the Quadrics documentation
*/
#define MPI_ALLOC_MEM 0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/select.h>
#include <getopt.h>
#include "mpi.h"
static int str2size(char *str)
{
int size;
char mod[32];
switch (sscanf(str, "%d%1[mMkK]", &size, mod)) {
case 1:
return (size);
case 2:
switch (*mod) {
case 'm':
case 'M':
return (size << 20);
case 'k':
case 'K':
return (size << 10);
default:
return (size);
}
default:
return (-1);
}
}
static void usage(void)
{
fprintf(stderr,
"Usage: mpi-ping [flags] <min bytes> [<max bytes>] [<inc bytes>]\n"
" mpi-ping -h\n");
exit(EXIT_FAILURE);
}
static void help(void)
{
printf
("Usage: mpi-ping [flags] <min bytes> [<max bytes>] [<inc bytes>]\n"
"\n" " Flags may be any of\n"
" -B use blocking send/recv\n"
" -C check data\n"
" -O overlapping pings\n"
" -W perform warm-up phase\n"
" -r number repetitions to time\n"
" -A use MPI_Alloc_mem to register memory\n"
" -h print this info\n" "\n"
" Numbers may be postfixed with 'k' or 'm'\n\n");
exit(EXIT_SUCCESS);
}
int main(int argc, char *argv[])
{
MPI_Status status;
MPI_Request recv_request;
MPI_Request send_request;
unsigned char *rbuf;
unsigned char *tbuf;
int c;
int i;
int bytes;
int nproc;
int peer;
int proc;
int r;
int tag = 0x666;
/*
* default options / arguments
*/
int reps = 10000;
int blocking = 0;
int check = 0;
int overlap = 0;
int warmup = 0;
int inc_bytes = 0;
int max_bytes = 0;
int min_bytes = 0;
int alloc_mem = 0;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &proc);
MPI_Comm_size(MPI_COMM_WORLD, &nproc);
while ((c = getopt(argc, argv, "BCOWAr:h")) != -1) {
switch (c) {
case 'B':
blocking = 1;
break;
case 'C':
check = 1;
break;
case 'O':
overlap = 1;
break;
case 'W':
warmup = 1;
break;
case 'A':
alloc_mem=1;
break;
case 'r':
if ((reps = str2size(optarg)) <= 0) {
usage();
}
break;
case 'h':
help();
default:
usage();
}
}
if (optind == argc) {
min_bytes = 0;
} else if ((min_bytes = str2size(argv[optind++])) < 0) {
usage();
}
if (optind == argc) {
max_bytes = min_bytes;
} else if ((max_bytes = str2size(argv[optind++])) < min_bytes) {
usage();
}
if (optind == argc) {
inc_bytes = 0;
} else if ((inc_bytes = str2size(argv[optind++])) < 0) {
usage();
}
if (nproc == 1) {
exit(EXIT_SUCCESS);
}
#if MPI_ALLOC_MEM
if(alloc_mem) {
MPI_Alloc_mem(max_bytes ? max_bytes: 8, MPI_INFO_NULL, &rbuf);
MPI_Alloc_mem(max_bytes ? max_bytes: 8, MPI_INFO_NULL, &tbuf);
}
else {
#endif
if ((rbuf = (unsigned char *) malloc(max_bytes ? max_bytes : 8)) == NULL) {
perror("malloc");
exit(EXIT_FAILURE);
}
if ((tbuf = (unsigned char *) malloc(max_bytes ? max_bytes : 8)) == NULL) {
perror("malloc");
exit(EXIT_FAILURE);
}
#if MPI_ALLOC_MEM
}
#endif
if (check) {
for (i = 0; i < max_bytes; i++) {
tbuf[i] = i & 255;
rbuf[i] = 0;
}
}
if (proc == 0) {
if (overlap) {
printf("mpi-ping: overlapping ping-pong\n");
} else if (blocking) {
printf("mpi-ping: ping-pong (using blocking send/recv)\n");
} else {
printf("mpi-ping: ping-pong\n");
}
if (check) {
printf("data checking enabled\n");
}
printf("nprocs=%d, reps=%d, min bytes=%d, max bytes=%d inc bytes=%d\n",
nproc, reps, min_bytes, max_bytes, inc_bytes);
fflush(stdout);
}
MPI_Barrier(MPI_COMM_WORLD);
peer = proc ^ 1;
if ((peer < nproc) && (peer & 1)) {
printf("%d pings %d\n", proc, peer);
fflush(stdout);
}
MPI_Barrier(MPI_COMM_WORLD);
if (warmup) {
if (proc == 0) {
puts("warm-up phase");
fflush(stdout);
}
for (r = 0; r < reps; r++) {
if (peer >= nproc) {
break;
}
MPI_Irecv(rbuf, max_bytes, MPI_BYTE, peer, tag, MPI_COMM_WORLD,
&recv_request);
MPI_Isend(tbuf, max_bytes, MPI_BYTE, peer, tag, MPI_COMM_WORLD,
&send_request);
MPI_Wait(&send_request, &status);
MPI_Wait(&recv_request, &status);
}
if (proc == 0) {
puts("warm-up phase done");
fflush(stdout);
}
}
MPI_Barrier(MPI_COMM_WORLD);
/*
* Main loop
*/
for (bytes = min_bytes; bytes <= max_bytes;
bytes = inc_bytes ? bytes + inc_bytes : bytes ? 2 * bytes : 1) {
double t = 0.0;
double tv[2];
r = reps;
MPI_Barrier(MPI_COMM_WORLD);
if (peer < nproc) {
if (overlap) {
/*
* MPI_Isend / MPI_Irecv overlapping ping-pong
*/
tv[0] = MPI_Wtime();
for (r = 0; r < reps; r++) {
MPI_Irecv(rbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD, &recv_request);
MPI_Isend(tbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD, &send_request);
MPI_Wait(&send_request, &status);
MPI_Wait(&recv_request, &status);
if (check) {
for (i = 0; i < bytes; i++) {
if (rbuf[i] != (unsigned char)(i & 255)) {
fprintf(stderr, "Error: index=%d sent %d received %d\n",
i, ((unsigned char)i)&255, (unsigned char)rbuf[i]);
}
rbuf[i] = 0;
}
}
}
tv[1] = MPI_Wtime();
} else if (blocking) {
/*
* MPI_Send / MPI_Recv ping-pong
*/
tv[0] = MPI_Wtime();
if (peer < nproc) {
if (proc & 1) {
r--;
MPI_Recv(rbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD, &status);
if (check) {
for (i = 0; i < bytes; i++) {
if (rbuf[i] != (unsigned char)(i & 255)) {
fprintf(stderr, "Error: index=%d sent %d received %d\n",
i, ((unsigned char)i)&255, (unsigned char)rbuf[i]);
}
rbuf[i] = 0;
}
}
}
while (r-- > 0) {
MPI_Send(tbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD);
MPI_Recv(rbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD, &status);
if (check) {
for (i = 0; i < bytes; i++) {
if (rbuf[i] != (unsigned char)(i & 255)) {
fprintf(stderr, "Error: index=%d sent %d received %d\n",
i, ((unsigned char)i)&255, (unsigned char)rbuf[i]);
}
rbuf[i] = 0;
}
}
}
if (proc & 1) {
MPI_Send(tbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD);
}
}
tv[1] = MPI_Wtime();
} else {
/*
* MPI_Isend / MPI_Irecv ping-pong
*/
tv[0] = MPI_Wtime();
if (peer < nproc) {
if (proc & 1) {
r--;
MPI_Irecv(rbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD, &recv_request);
MPI_Wait(&recv_request, &status);
if (check) {
for (i = 0; i < bytes; i++) {
if (rbuf[i] != (unsigned char)(i & 255)) {
fprintf(stderr, "Error: index=%d sent %d received %d\n",
i, ((unsigned char)i)&255, (unsigned char)rbuf[i]);
}
rbuf[i] = 0;
}
}
}
while (r-- > 0) {
MPI_Isend(tbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD, &send_request);
MPI_Wait(&send_request, &status);
MPI_Irecv(rbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD, &recv_request);
MPI_Wait(&recv_request, &status);
if (check) {
for (i = 0; i < bytes; i++) {
if (rbuf[i] != (unsigned char)(i & 255)) {
fprintf(stderr, "Error: index=%d sent %d received %d\n",
i, ((unsigned char)i)&255, (unsigned char)rbuf[i]);
}
rbuf[i] = 0;
}
}
}
if (proc & 1) {
MPI_Isend(tbuf, bytes, MPI_BYTE, peer, tag,
MPI_COMM_WORLD, &send_request);
MPI_Wait(&send_request, &status);
}
}
tv[1] = MPI_Wtime();
}
/*
* Calculate time interval in useconds (half round trip)
*/
t = (tv[1] - tv[0]) * 1000000.0 / (2 * reps);
}
MPI_Barrier(MPI_COMM_WORLD);
if ((peer < nproc) && (peer & 1)) {
printf("%3d pinged %3d: %8d bytes %9.2f uSec %8.2f MB/s\n",
proc, peer, bytes, t, bytes / (t));
fflush(stdout);
}
}
MPI_Barrier(MPI_COMM_WORLD);
MPI_Finalize();
return EXIT_SUCCESS;
}