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/**
* @file app.c
* @brief Template for a Host Application Source File.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <assert.h>
#include <stdint.h>
#include <omp.h>
#include "../../support/timer.h"
#define XSTR(x) STR(x)
#define STR(x) #x
#ifndef T
#define T int32_t
#endif
static T *A;
static T *B;
static T *C;
static T *C2;
/**
* @brief creates a "test file" by filling a buffer of 64MB with pseudo-random values
* @param nr_elements how many 32-bit elements we want the file to be
* @return the buffer address
*/
void *create_test_file(unsigned int nr_elements) {
srand(0);
A = (T*) malloc(nr_elements * sizeof(T));
B = (T*) malloc(nr_elements * sizeof(T));
C = (T*) malloc(nr_elements * sizeof(T));
for (int i = 0; i < nr_elements; i++) {
A[i] = (T) (rand());
B[i] = (T) (rand());
}
}
/**
* @brief compute output in the host
*/
static void vector_addition_host(unsigned int nr_elements, int t) {
omp_set_num_threads(t);
#pragma omp parallel for
for (int i = 0; i < nr_elements; i++) {
C[i] = A[i] + B[i];
}
}
// Params ---------------------------------------------------------------------
typedef struct Params {
int input_size;
int n_warmup;
int n_reps;
int exp;
int n_threads;
}Params;
void usage() {
fprintf(stderr,
"\nUsage: ./program [options]"
"\n"
"\nGeneral options:"
"\n -h help"
"\n -t <T> # of threads (default=8)"
"\n -w <W> # of untimed warmup iterations (default=1)"
"\n -e <E> # of timed repetition iterations (default=3)"
"\n -x <X> Weak (0) or strong (1) scaling (default=0)"
"\n"
"\nBenchmark-specific options:"
"\n -i <I> input size (default=8M elements)"
"\n");
}
struct Params input_params(int argc, char **argv) {
struct Params p;
p.input_size = 16777216;
p.n_warmup = 1;
p.n_reps = 3;
p.exp = 0;
p.n_threads = 5;
int opt;
while((opt = getopt(argc, argv, "hi:w:e:x:t:")) >= 0) {
switch(opt) {
case 'h':
usage();
exit(0);
break;
case 'i': p.input_size = atoi(optarg); break;
case 'w': p.n_warmup = atoi(optarg); break;
case 'e': p.n_reps = atoi(optarg); break;
case 'x': p.exp = atoi(optarg); break;
case 't': p.n_threads = atoi(optarg); break;
default:
fprintf(stderr, "\nUnrecognized option!\n");
usage();
exit(0);
}
}
assert(p.n_threads > 0 && "Invalid # of ranks!");
return p;
}
/**
* @brief Main of the Host Application.
*/
int main(int argc, char **argv) {
struct Params p = input_params(argc, argv);
const unsigned int file_size = p.exp == 0 ? p.input_size * p.n_threads : p.input_size;
// Create an input file with arbitrary data.
create_test_file(file_size);
Timer timer;
for(int rep = 0; rep < p.n_warmup + p.n_reps; rep++) {
start(&timer, 0, 0);
vector_addition_host(file_size, p.n_threads);
stop(&timer, 0);
unsigned int nr_threads = 0;
#pragma omp parallel
#pragma omp atomic
nr_threads++;
if (rep >= p.n_warmup) {
printf("[::] n_threads=%d e_type=%s n_elements=%d "
"| throughput_cpu_MBps=%f\n",
nr_threads, XSTR(T), file_size,
file_size * 3 * sizeof(T) / timer.time[0]);
printf("[::] n_threads=%d e_type=%s n_elements=%d "
"| throughput_cpu_MOpps=%f\n",
nr_threads, XSTR(T), file_size,
file_size / timer.time[0]);
printf("[::] n_threads=%d e_type=%s n_elements=%d |",
nr_threads, XSTR(T), file_size);
printall(&timer, 0);
}
}
free(A);
free(B);
free(C);
return 0;
}
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