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- //---------------------------------------------------------------------------//
- // Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@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 <numeric>
- #include <vector>
- #include <tbb/blocked_range.h>
- #include <tbb/parallel_reduce.h>
- #include "perf.hpp"
- int rand_int()
- {
- return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
- }
- template<class T>
- struct Sum {
- T value;
- Sum() : value(0) {}
- Sum( Sum& s, tbb::split ) {value = 0;}
- void operator()( const tbb::blocked_range<T*>& r ) {
- T temp = value;
- for( T* a=r.begin(); a!=r.end(); ++a ) {
- temp += *a;
- }
- value = temp;
- }
- void join( Sum& rhs ) {value += rhs.value;}
- };
- template<class T>
- T ParallelSum( T array[], size_t n ) {
- Sum<T> total;
- tbb::parallel_reduce( tbb::blocked_range<T*>( array, array+n ),
- total );
- return total.value;
- }
- 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
- std::vector<int> host_vector(PERF_N);
- std::generate(host_vector.begin(), host_vector.end(), rand_int);
- int sum = 0;
- perf_timer t;
- for(size_t trial = 0; trial < PERF_TRIALS; trial++){
- t.start();
- sum = ParallelSum<int>(&host_vector[0], host_vector.size());
- t.stop();
- }
- std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
- std::cout << "sum: " << sum << std::endl;
- int host_sum = std::accumulate(host_vector.begin(), host_vector.end(), int(0));
- if(sum != host_sum){
- std::cerr << "ERROR: sum (" << sum << ") != (" << host_sum << ")" << std::endl;
- return -1;
- }
- return 0;
- }
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