1 //---------------------------------------------------------------------------//
2 // Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
3 //
4 // Distributed under the Boost Software License, Version 1.0
5 // See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt
7 //
8 // See http://boostorg.github.com/compute for more information.
9 //---------------------------------------------------------------------------//
10
11 #include <algorithm>
12 #include <iostream>
13 #include <vector>
14
15 #include "perf.hpp"
16
rand_float()17 float rand_float()
18 {
19 return (float(rand()) / float(RAND_MAX)) * 1000.f;
20 }
21
22 // y <- alpha * x + y
serial_saxpy(size_t n,float alpha,const float * x,float * y)23 void serial_saxpy(size_t n, float alpha, const float *x, float *y)
24 {
25 for(size_t i = 0; i < n; i++){
26 y[i] = alpha * x[i] + y[i];
27 }
28 }
29
main(int argc,char * argv[])30 int main(int argc, char *argv[])
31 {
32 perf_parse_args(argc, argv);
33
34 std::cout << "size: " << PERF_N << std::endl;
35
36 float alpha = 2.5f;
37
38 std::vector<float> host_x(PERF_N);
39 std::vector<float> host_y(PERF_N);
40 std::generate(host_x.begin(), host_x.end(), rand_float);
41 std::generate(host_y.begin(), host_y.end(), rand_float);
42
43 perf_timer t;
44 for(size_t trial = 0; trial < PERF_TRIALS; trial++){
45 t.start();
46 serial_saxpy(PERF_N, alpha, &host_x[0], &host_y[0]);
47 t.stop();
48 }
49 std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
50
51 return 0;
52 }
53