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- //---------------------------------------------------------------------------//
- // Copyright (c) 2015 Jakub Szuppe <j.szuppe@gmail.com>
- //
- // Distributed under the Boost Software License, Version 1.0
- // See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt
- //
- // See http://boostorg.github.com/compute for more information.
- //---------------------------------------------------------------------------//
- #include <algorithm>
- #include <iostream>
- #include <vector>
- #include <thrust/find.h>
- #include <thrust/host_vector.h>
- #include <thrust/device_vector.h>
- #include "perf.hpp"
- // Max integer that can be generated by rand_int() function.
- int rand_int_max = 25;
- int rand_int()
- {
- return static_cast<int>((rand() / double(RAND_MAX)) * rand_int_max);
- }
- int main(int argc, char *argv[])
- {
- perf_parse_args(argc, argv);
- std::cout << "size: " << PERF_N << std::endl;
- // create vector of random numbers on the host
- thrust::host_vector<int> host_vector(PERF_N);
- thrust::generate(host_vector.begin(), host_vector.end(), rand_int);
- thrust::device_vector<int> v = host_vector;
- // trying to find element that isn't in vector (worst-case scenario)
- int wanted = rand_int_max + 1;
-
- // result
- thrust::device_vector<int>::iterator device_result_it;
-
- perf_timer t;
- for(size_t trial = 0; trial < PERF_TRIALS; trial++){
- t.start();
- device_result_it = thrust::find(v.begin(), v.end(), wanted);
- cudaDeviceSynchronize();
- t.stop();
- }
- std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
- // verify
- if(device_result_it != v.end()){
- std::cout << "ERROR: "
- << "device_result_iterator != "
- << "v.end()"
- << std::endl;
- return -1;
- }
-
- return 0;
- }
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