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/*
* JGL@SAFARI
*/
/**
* GPU code with Thrust
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <assert.h>
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <math.h>
#include <sys/time.h>
#include <vector>
#include <thrust/device_vector.h>
#include <thrust/host_vector.h>
#include <thrust/scan.h>
#include <thrust/copy.h>
#include "../../support/common.h"
#include "../../support/timer.h"
#define ANSI_COLOR_RED "\x1b[31m"
#define ANSI_COLOR_GREEN "\x1b[32m"
#define ANSI_COLOR_RESET "\x1b[0m"
// Pointer declaration
static T* A;
static T* C;
static T* C2;
/**
* @brief creates input arrays
* @param nr_elements how many elements in input arrays
*/
static void read_input(T* A, unsigned int nr_elements) {
//srand(0);
printf("nr_elements\t%u\t", nr_elements);
for (unsigned int i = 0; i < nr_elements; i++) {
//A[i] = (T) (rand()) % 2;
A[i] = i;
}
}
/**
* @brief compute output in the host
*/
static void scan_host(T* C, T* A, unsigned int nr_elements) {
C[0] = A[0];
for (unsigned int i = 1; i < nr_elements; i++) {
C[i] = C[i - 1] + A[i - 1];
}
}
// Params ---------------------------------------------------------------------
typedef struct Params {
unsigned 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 -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 -t <T> # of threads (default=8)"
"\n"
"\nBenchmark-specific options:"
"\n -i <I> input size (default=640 * 3932160 elements)"
"\n");
}
struct Params input_params(int argc, char **argv) {
struct Params p;
p.input_size = 1258291200;
p.n_warmup = 1;
p.n_reps = 3;
p.exp = 0;
p.n_threads = 8;
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 threads!");
return p;
}
/**
* @brief Main of the Host Application.
*/
int main(int argc, char **argv) {
cudaDeviceProp device_properties;
cudaGetDeviceProperties(&device_properties, 0);
cudaSetDevice(0);
struct Params p = input_params(argc, argv);
unsigned int nr_of_dpus = 1;
unsigned int i = 0;
const unsigned int input_size = p.exp == 0 ? p.input_size * nr_of_dpus : p.input_size;
// Input/output allocation
A = (T*)malloc(input_size * sizeof(T));
C = (T*)malloc(input_size * sizeof(T));
C2 = (T*)malloc(input_size * sizeof(T));
T *bufferA = A;
T *bufferC = C2;
// Create an input file with arbitrary data.
read_input(A, input_size);
// Timer declaration
Timer timer;
float time_gpu = 0;
thrust::host_vector<T> h_output(input_size);
// Loop over main kernel
for(int rep = 0; rep < p.n_warmup + p.n_reps; rep++) {
// Compute output on CPU (performance comparison and verification purposes)
if(rep >= p.n_warmup)
start(&timer, 0, rep - p.n_warmup);
scan_host(C, A, input_size);
if(rep >= p.n_warmup)
stop(&timer, 0);
// Event creation
cudaEvent_t start, stop;
cudaEventCreate(&start);
cudaEventCreate(&stop);
float time1 = 0;
thrust::device_vector<T> d_input(input_size);
cudaMemcpy(thrust::raw_pointer_cast(&d_input[0]), A, input_size * sizeof(T), cudaMemcpyHostToDevice);
// Start timer
cudaEventRecord( start, 0 );
thrust::exclusive_scan(d_input.begin(),d_input.end(),d_input.begin());
// End timer
cudaEventRecord( stop, 0 );
cudaEventSynchronize( stop );
cudaEventElapsedTime( &time1, start, stop );
time_gpu += time1;
h_output = d_input;
cudaEventDestroy(start);
cudaEventDestroy(stop);
}
// Print timing results
printf("CPU ");
print(&timer, 0, p.n_reps);
printf("Kernel (ms):");
printf("%f\n", time_gpu / p.n_reps);
// Check output
bool status = true;
for (i = 0; i < input_size; i++) {
if(C[i] != h_output[i]){
status = false;
printf("%d: %lu -- %lu\n", i, C[i], h_output[i]);
}
}
if (status) {
printf("[" ANSI_COLOR_GREEN "OK" ANSI_COLOR_RESET "] Outputs are equal\n");
} else {
printf("[" ANSI_COLOR_RED "ERROR" ANSI_COLOR_RESET "] Outputs differ!\n");
}
// Deallocation
free(A);
free(C);
free(C2);
return 0;
}
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