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/*
* JGL@SAFARI
*/
/**
* @file app.c
* @brief Template for a Host Application Source File.
*
* The macros DPU_BINARY and NR_TASKLETS are directly
* used in the static functions, and are not passed as arguments of these functions.
*/
#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/common.h"
#include "../../support/timer.h"
// Pointer declaration
static T* A;
static unsigned int* histo_host;
typedef struct Params {
unsigned int input_size;
unsigned int bins;
int n_warmup;
int n_reps;
const char *file_name;
int exp;
int n_threads;
}Params;
/**
* @brief creates input arrays
* @param nr_elements how many elements in input arrays
*/
static void read_input(T* A, const Params p) {
char dctFileName[100];
FILE *File = NULL;
// Open input file
unsigned short temp;
sprintf(dctFileName, p.file_name);
if((File = fopen(dctFileName, "rb")) != NULL) {
for(unsigned int y = 0; y < p.input_size; y++) {
fread(&temp, sizeof(unsigned short), 1, File);
A[y] = (unsigned int)ByteSwap16(temp);
if(A[y] >= 4096)
A[y] = 4095;
}
fclose(File);
} else {
printf("%s does not exist\n", dctFileName);
exit(1);
}
}
/**
* @brief compute output in the host
*/
static void histogram_host(unsigned int* histo, T* A, unsigned int bins, unsigned int nr_elements, int exp, unsigned int nr_of_dpus, int t) {
omp_set_num_threads(t);
if(!exp){
#pragma omp parallel for
for (unsigned int i = 0; i < nr_of_dpus; i++) {
for (unsigned int j = 0; j < nr_elements; j++) {
T d = A[j];
histo[i * bins + ((d * bins) >> DEPTH)] += 1;
}
}
}
else{
#pragma omp parallel for
for (unsigned int j = 0; j < nr_elements; j++) {
T d = A[j];
#pragma omp atomic update
histo[(d * bins) >> DEPTH] += 1;
}
}
}
// Params ---------------------------------------------------------------------
void usage() {
fprintf(stderr,
"\nUsage: ./program [options]"
"\n"
"\nGeneral options:"
"\n -h help"
"\n -w <W> # of untimed warmup iterations (default=1)"
"\n -e <E> # of timed repetition iterations (default=3)"
"\n -t <T> # of threads (default=8)"
"\n -x <X> Weak (0) or strong (1) scaling (default=0)"
"\n"
"\nBenchmark-specific options:"
"\n -i <I> input size (default=1536*1024 elements)"
"\n -b <B> histogram size (default=256 bins)"
"\n -f <F> input image file (default=../input/image_VanHateren.iml)"
"\n");
}
struct Params input_params(int argc, char **argv) {
struct Params p;
p.input_size = 1536 * 1024;
p.bins = 256;
p.n_warmup = 1;
p.n_reps = 3;
p.n_threads = 8;
p.exp = 1;
p.file_name = "../../input/image_VanHateren.iml";
int opt;
while((opt = getopt(argc, argv, "hi:b:w:e:f:x:t:")) >= 0) {
switch(opt) {
case 'h':
usage();
exit(0);
break;
case 'i': p.input_size = atoi(optarg); break;
case 'b': p.bins = atoi(optarg); break;
case 'w': p.n_warmup = atoi(optarg); break;
case 'e': p.n_reps = atoi(optarg); break;
case 'f': p.file_name = 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);
uint32_t nr_of_dpus;
const unsigned int input_size = p.input_size; // Size of input image
if(!p.exp)
assert(input_size % p.n_threads == 0 && "Input size!");
else
assert(input_size % p.n_threads == 0 && "Input size!");
// Input/output allocation
A = malloc(input_size * sizeof(T));
T *bufferA = A;
if(!p.exp)
histo_host = malloc(nr_of_dpus * p.bins * sizeof(unsigned int));
else
histo_host = malloc(p.bins * sizeof(unsigned int));
// Create an input file with arbitrary data.
read_input(A, p);
Timer timer;
start(&timer, 0, 0);
if(!p.exp)
memset(histo_host, 0, nr_of_dpus * p.bins * sizeof(unsigned int));
else
memset(histo_host, 0, p.bins * sizeof(unsigned int));
histogram_host(histo_host, A, p.bins, input_size, p.exp, nr_of_dpus, p.n_threads);
stop(&timer, 0);
printf("Kernel ");
print(&timer, 0, 1);
printf("\n");
return 0;
}
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