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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mpi.h>
#include "comex.h"
static int me;
static int nproc;
static int size[] = {2,4,8,16,32,64,128,256,512,1024,1024*1024,1024*1024*8,0}; /* 0 is sentinal */
#define PUT_FORWARD 0
#define PUT_BACKWARD 1
#define GET_FORWARD 2
#define GET_BACKWARD 3
#define ACC_FORWARD 4
#define ACC_BACKWARD 5
static void fill_array(double *arr, int count, int which);
static void shift(size_t buffer_size, int op);
int main(int argc, char **argv)
{
int i;
comex_init_args(&argc, &argv);
comex_group_rank(COMEX_GROUP_WORLD, &me);
comex_group_size(COMEX_GROUP_WORLD, &nproc);
if (0 == me) {
printf("msg size (bytes) avg time (milliseconds) avg b/w (bytes/sec)\n");
}
if (0 == me) {
printf("shifting acc forward\n");
}
for (i=0; size[i]!=0; ++i) {
shift(size[i], ACC_FORWARD);
}
if (0 == me) {
printf("shifting acc backward\n");
}
for (i=0; size[i]!=0; ++i) {
shift(size[i], ACC_BACKWARD);
}
if (0 == me) {
printf("shifting put forward\n");
}
for (i=0; size[i]!=0; ++i) {
shift(size[i], PUT_FORWARD);
}
if (0 == me) {
printf("shifting put backward\n");
}
for (i=0; size[i]!=0; ++i) {
shift(size[i], PUT_BACKWARD);
}
if (0 == me) {
printf("shifting get forward\n");
}
for (i=0; size[i]!=0; ++i) {
shift(size[i], GET_FORWARD);
}
if (0 == me) {
printf("shifting get backward\n");
}
for (i=0; size[i]!=0; ++i) {
shift(size[i], GET_BACKWARD);
}
comex_finalize();
MPI_Finalize();
return 0;
}
static void fill_array(double *arr, int count, int which)
{
int i;
for (i = 0; i < count; i++) {
arr[i] = i * 8.23 + which * 2.89;
}
}
static void shift(size_t buffer_size, int op)
{
void **dst_ptr;
void **put_buf;
void **get_buf;
double scale = 2.0;
int i=0;
double *times;
double *result;
double total_time=0;
MPI_Comm comm = MPI_COMM_NULL;
comex_group_comm(COMEX_GROUP_WORLD, &comm);
dst_ptr = (void*)malloc(nproc * sizeof(void*));
put_buf = (void*)malloc(nproc * sizeof(void*));
get_buf = (void*)malloc(nproc * sizeof(void*));
times = (double*)malloc(nproc * sizeof(double));
result = (double*)malloc(nproc * sizeof(double));
comex_malloc(dst_ptr, buffer_size, COMEX_GROUP_WORLD);
comex_malloc(put_buf, buffer_size, COMEX_GROUP_WORLD);
comex_malloc(get_buf, buffer_size, COMEX_GROUP_WORLD);
/* initialize what we're putting */
fill_array((double*)put_buf[me], buffer_size/sizeof(double), me);
/* initialize time keepers */
(void)memset(times, 0, nproc*sizeof(double));
(void)memset(result, 0, nproc*sizeof(double));
times[me] = MPI_Wtime()*1.0e6;
/* the shift */
switch (op) {
case ACC_FORWARD:
for (i=1; i<nproc; ++i) {
int dst = (me+i)%nproc;
comex_acc(COMEX_ACC_DBL, &scale, put_buf[me], dst_ptr[dst], buffer_size, dst, COMEX_GROUP_WORLD);
comex_barrier(COMEX_GROUP_WORLD);
}
break;
case ACC_BACKWARD:
for (i=1; i<nproc; ++i) {
int dst = me<i ? me-i+nproc : me-i;
comex_acc(COMEX_ACC_DBL, &scale, put_buf[me], dst_ptr[dst], buffer_size, dst, COMEX_GROUP_WORLD);
comex_barrier(COMEX_GROUP_WORLD);
}
break;
case PUT_FORWARD:
for (i=1; i<nproc; ++i) {
int dst = (me+i)%nproc;
comex_put(put_buf[me], dst_ptr[dst], buffer_size, dst, COMEX_GROUP_WORLD);
comex_barrier(COMEX_GROUP_WORLD);
}
break;
case PUT_BACKWARD:
for (i=1; i<nproc; ++i) {
int dst = me<i ? me-i+nproc : me-i;
comex_put(put_buf[me], dst_ptr[dst], buffer_size, dst, COMEX_GROUP_WORLD);
comex_barrier(COMEX_GROUP_WORLD);
}
break;
case GET_FORWARD:
for (i=1; i<nproc; ++i) {
int dst = (me+i)%nproc;
comex_get(dst_ptr[dst], get_buf[me], buffer_size, dst, COMEX_GROUP_WORLD);
comex_barrier(COMEX_GROUP_WORLD);
}
break;
case GET_BACKWARD:
for (i=1; i<nproc; ++i) {
int dst = me<i ? me-i+nproc : me-i;
comex_get(dst_ptr[dst], get_buf[me], buffer_size, dst, COMEX_GROUP_WORLD);
comex_barrier(COMEX_GROUP_WORLD);
}
break;
default:
comex_error("oops", 1);
}
/* calculate total time and average time */
times[me] = MPI_Wtime()*1.0e6 - times[me];
MPI_Allreduce(times, result, nproc, MPI_DOUBLE, MPI_SUM, comm);
for (i=0; i<nproc; ++i) {
total_time += times[i];
}
if (0 == me) {
printf("%zu\t%f\t%f\n",
buffer_size,
total_time/nproc*1000,
buffer_size*(nproc-1)/total_time);
}
comex_free(dst_ptr[me], COMEX_GROUP_WORLD);
comex_free(put_buf[me], COMEX_GROUP_WORLD);
comex_free(get_buf[me], COMEX_GROUP_WORLD);
free(dst_ptr);
free(put_buf);
free(get_buf);
free(times);
}
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