1 //---------------------------------------------------------------------------//
2 // Copyright (c) 2015 Jakub Szuppe <j.szuppe@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 <thrust/find.h>
16 #include <thrust/host_vector.h>
17 #include <thrust/device_vector.h>
18 
19 #include "perf.hpp"
20 
21 // Max integer that can be generated by rand_int() function.
22 int rand_int_max = 25;
23 
rand_int()24 int rand_int()
25 {
26     return static_cast<int>((rand() / double(RAND_MAX)) * rand_int_max);
27 }
28 
main(int argc,char * argv[])29 int main(int argc, char *argv[])
30 {
31     perf_parse_args(argc, argv);
32     std::cout << "size: " << PERF_N << std::endl;
33 
34     // create vector of random numbers on the host
35     thrust::host_vector<int> host_vector(PERF_N);
36     thrust::generate(host_vector.begin(), host_vector.end(), rand_int);
37 
38     thrust::device_vector<int> v = host_vector;
39 
40     // trying to find element that isn't in vector (worst-case scenario)
41     int wanted = rand_int_max + 1;
42 
43     // result
44     thrust::device_vector<int>::iterator device_result_it;
45 
46     perf_timer t;
47     for(size_t trial = 0; trial < PERF_TRIALS; trial++){
48         t.start();
49         device_result_it = thrust::find(v.begin(), v.end(), wanted);
50         cudaDeviceSynchronize();
51         t.stop();
52     }
53     std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
54 
55     // verify
56     if(device_result_it != v.end()){
57         std::cout << "ERROR: "
58                   << "device_result_iterator != "
59                   << "v.end()"
60                   << std::endl;
61         return -1;
62     }
63 
64     return 0;
65 }
66