76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
//---------------------------------------------------------------------------//
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// Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#include <algorithm>
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#include <iostream>
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#include <numeric>
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#include <vector>
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#include <tbb/blocked_range.h>
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#include <tbb/parallel_reduce.h>
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#include "perf.hpp"
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int rand_int()
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{
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return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
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}
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template<class T>
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struct Sum {
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T value;
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Sum() : value(0) {}
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Sum( Sum& s, tbb::split ) {value = 0;}
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void operator()( const tbb::blocked_range<T*>& r ) {
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T temp = value;
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for( T* a=r.begin(); a!=r.end(); ++a ) {
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temp += *a;
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}
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value = temp;
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}
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void join( Sum& rhs ) {value += rhs.value;}
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};
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template<class T>
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T ParallelSum( T array[], size_t n ) {
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Sum<T> total;
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tbb::parallel_reduce( tbb::blocked_range<T*>( array, array+n ),
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total );
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return total.value;
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}
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int main(int argc, char *argv[])
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{
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perf_parse_args(argc, argv);
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std::cout << "size: " << PERF_N << std::endl;
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// create vector of random numbers on the host
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std::vector<int> host_vector(PERF_N);
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std::generate(host_vector.begin(), host_vector.end(), rand_int);
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int sum = 0;
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perf_timer t;
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for(size_t trial = 0; trial < PERF_TRIALS; trial++){
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t.start();
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sum = ParallelSum<int>(&host_vector[0], host_vector.size());
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t.stop();
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}
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std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
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std::cout << "sum: " << sum << std::endl;
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int host_sum = std::accumulate(host_vector.begin(), host_vector.end(), int(0));
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if(sum != host_sum){
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std::cerr << "ERROR: sum (" << sum << ") != (" << host_sum << ")" << std::endl;
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return -1;
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}
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return 0;
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}
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