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#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 T int64_t
static int pos;
static T *A;
static T *B;
static T *C;
static T *C2;
// Create a "test file"
static T *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));
printf("nr_elements\t%u\t", nr_elements);
for (int i = 0; i < nr_elements; i++) {
//A[i] = (unsigned int) (rand());
//A[i] = i+1;
//A[i] = i%2==0?i+1:i;
A[i] = i%2==0?i:i+1;
B[i] = 0;
}
return A;
}
// Compute output in the host
static int unique_host(int size, int t) {
pos = 0;
C[pos] = A[pos];
omp_set_num_threads(t);
#pragma omp parallel for
for(int my = 1; my < size; my++) {
if(A[my] != A[my-1]) {
int p;
#pragma omp atomic update
pos++;
p = pos;
C[p] = A[my];
}
}
return pos;
}
// Params
typedef struct Params {
int input_size;
int n_warmup;
int n_reps;
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"
"\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 = 16 << 20;
p.n_warmup = 1;
p.n_reps = 3;
p.n_threads = 8;
int opt;
while((opt = getopt(argc, argv, "hd:i:w:e: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 '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;
}
// Main
int main(int argc, char **argv) {
struct Params p = input_params(argc, argv);
const unsigned int file_size = p.input_size;
uint32_t accum = 0;
int total_count;
// Create an input file with arbitrary data
create_test_file(file_size);
Timer timer;
start(&timer, 0, 0);
total_count = unique_host(file_size, p.n_threads);
stop(&timer, 0);
printf("Total count = %d\t", total_count);
printf("Kernel ");
print(&timer, 0, 1);
printf("\n");
free(A);
free(B);
free(C);
return 0;
}
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