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/*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include "mpi.h"
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 size;
int dest, src;
int tag0=41; /* MPI message tag */
int inject;
int report;
int iterations;
int n_bytes;
unsigned char* send_buff;
unsigned char* recv_buff;
char* tmp;
int i, j, count;
float fraction, randval;
struct timeval tp;
if (1 < argc) {
if (0 == strncmp(argv[1], "-h", 2) ||
0 == strncmp(argv[1], "--h", 3)) {
printf("Usage: mpirun --options-- ./sendrecv_blaster <options> where options are:\n"
"\tpattern=[self | pair | ring] where\n"
"\t\tself => sendrecv with self\n"
"\t\tpair => sendrecv with a complementary partner [0 <-> N-1, 1 <-> N-2...]\n"
"\t\tring [default] => sendrecv around a ring [0 recvs from N-1 and sends to 1]\n"
"\tsize=[value < 0 => max message size in kbytes, value > 0 => max message size in Mbytes (default=1MByte)]\n"
"\tinject=[value = #iterations before injecting MPI_Sendrecv to self (default: never)]\n"
"\treport=[value = #iterations/reporting point (default: 1000)\n"
"\titerations=[value = #iterations before stopping (default: 1000000)\n");
return 0;
}
}
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);
}
mpierr = MPI_Comm_size(MPI_COMM_WORLD, &size);
if (mpierr != MPI_SUCCESS || size < 0)
{
fprintf(stderr, "MPI Error %d (MPI_Comm_size)\n",mpierr);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
/* setup defaults in lieu of args */
n_bytes = 1024*1024;
inject = -1;
report = 1000;
iterations = 1000000;
/* do a ring */
src = rank - 1;
if (src < 0) {
src = size - 1;
}
dest = rank + 1;
if (dest > size-1) {
dest = 0;
}
for (i=1; i < argc; i++) {
fprintf(stderr, "got %s\n", argv[i]);
if (0 == strncmp(argv[i], "pattern", strlen("pattern"))) {
tmp = strchr(argv[i], '=');
tmp++;
if (0 == strcmp(tmp, "self")) {
/* just do it with myself */
src = rank;
dest = rank;
} else if (0 == strcmp(tmp, "pair")) {
/* do it pair-wise */
src = (size-1) - rank;
dest = src;
} else {
/* do a ring */
src = rank - 1;
if (src < 0) {
src = size - 1;
}
dest = rank + 1;
if (dest > size-1) {
dest = 0;
}
}
} else if (0 == strncmp(argv[i], "size", strlen("size"))) {
tmp = strchr(argv[i], '=');
tmp++;
n_bytes = atoi(tmp);
if (n_bytes < 0) {
n_bytes = -1 * n_bytes * 1024;
} else {
n_bytes = n_bytes * 1024*1024;
}
} else if (0 == strncmp(argv[i], "inject", strlen("inject"))) {
tmp = strchr(argv[i], '=');
tmp++;
inject = atoi(tmp);
} else if (0 == strncmp(argv[i], "report", strlen("report"))) {
tmp = strchr(argv[i], '=');
tmp++;
report = atoi(tmp);
} else if (0 == strncmp(argv[i], "iter", strlen("iter"))) {
tmp = strchr(argv[i], '=');
tmp++;
iterations = atoi(tmp);
}
}
send_buff = (unsigned char *) valloc(n_bytes);
recv_buff = (unsigned char *) valloc(n_bytes);
/* seed the random number generator */
gettimeofday (&tp, NULL);
srand (tp.tv_usec);
for ( i=0; i<n_bytes; i++ )
{
send_buff[i] = i%128;
}
fprintf(stderr, "Rank %d: recving from src %d sending to dest %d with max buff size %dKbytes\n",
rank, src, dest, n_bytes/1024);
i=0;
while (i < iterations)
{
randval = rand();
fraction = randval/RAND_MAX;
count = fraction * n_bytes;
mpierr = MPI_Sendrecv(send_buff, count, MPI_CHAR, dest, tag0,
recv_buff, n_bytes, MPI_CHAR, src, tag0, MPI_COMM_WORLD, &status);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Sendrecv) [%d,%d] at iteration %d\n",mpierr,src,dest,i);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
}
i++;
if (0 == (i % report)) {
fprintf(stderr, "Rank %d has completed %dk iterations\n", rank, i/1000);
}
if (0 < inject && 0 == (i % inject)) {
mpierr = MPI_Sendrecv(send_buff, count, MPI_CHAR, rank, tag0,
recv_buff, n_bytes, MPI_CHAR, rank, tag0, MPI_COMM_WORLD, &status);
if (mpierr != MPI_SUCCESS)
{
fprintf(stderr,"MPI Error %d (MPI_Sendrecv) [%d,%d] at iteration %d\n",mpierr,rank,rank,i);
fflush(stderr);
MPI_Abort(MPI_COMM_WORLD, -1);
} else {
fprintf(stderr, "Rank %d has completed MPI_Sendrecv with myself\n", rank);
}
}
}
fprintf(stderr, "Rank %d completed test\n", rank);
MPI_Finalize();
}
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