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- // Benchmark for integer sorting speed across parallel threads.
- //
- // Copyright Steven Ross 2014
- //
- // 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://www.boost.org/libs/sort for library home page.
- #include <boost/random/mersenne_twister.hpp>
- #include <boost/random/uniform_int_distribution.hpp>
- #include <boost/sort/spreadsort/spreadsort.hpp>
- #include <boost/thread.hpp>
- #include <time.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <algorithm>
- #include <vector>
- #include <iostream>
- #include <fstream>
- #include <string>
- using std::string;
- using namespace boost::sort::spreadsort;
- #define DATA_TYPE string
- static bool is_sorted(const std::vector<DATA_TYPE> &array) {
- for (unsigned u = 0; u + 1 < array.size(); ++u) {
- if (array[u] > array[u + 1]) {
- return false;
- }
- }
- return true;
- }
- static void sort_core(std::vector<DATA_TYPE> &array, bool stdSort,
- unsigned loopCount) {
- if (stdSort)
- std::sort(array.begin(), array.end());
- else
- boost::sort::spreadsort::spreadsort(array.begin(), array.end());
- if (!is_sorted(array)) {
- fprintf(stderr, "sort failed!\n");
- exit(1);
- }
- }
- static void sort_loop(const std::vector<DATA_TYPE> &base_array, bool stdSort,
- unsigned loopCount) {
- std::vector<DATA_TYPE> array(base_array);
- for (unsigned u = 0; u < loopCount; ++u) {
- for (unsigned v = 0; v < base_array.size(); ++v) {
- array[v] = base_array[v];
- }
- sort_core(array, stdSort, loopCount);
- }
- }
- //Pass in an argument to test std::sort
- int main(int argc, const char ** argv) {
- std::ifstream indata;
- std::ofstream outfile;
- bool stdSort = false;
- int constant_to_random_ratio = -1;
- int threadCount = -1;
- unsigned loopCount = 0;
- for (int u = 1; u < argc; ++u) {
- if (std::string(argv[u]) == "-std")
- stdSort = true;
- else if(threadCount < 0)
- threadCount = atoi(argv[u]);
- else if (!loopCount)
- loopCount = atoi(argv[u]);
- else
- constant_to_random_ratio = atoi(argv[u]);
- }
- if (!loopCount) {
- loopCount = 1;
- }
- printf("threads: %d loops: %d\n", threadCount, loopCount);
- std::vector<DATA_TYPE> base_array;
- if (constant_to_random_ratio >= 0) {
- //Test for random data with gaps of identical data.
- random::mt19937 generator;
- random::uniform_int_distribution<int> distribution(0,255);
- const int constant_to_random_count = 1000000;
- const int string_length = 1000;
- for (int i = 0; i < constant_to_random_count; ++i) {
- DATA_TYPE temp(string_length, 'x'); // fill with default character.
- for (int j = constant_to_random_ratio; j < string_length;) {
- int val = distribution(generator);
- temp[j] = val;
- j += (val * constant_to_random_ratio)/128 + 1;
- }
- base_array.push_back(temp);
- }
- } else {
- indata.open("input.txt", std::ios_base::in | std::ios_base::binary);
- if (indata.bad()) {
- printf("input.txt could not be opened\n");
- return 1;
- }
- DATA_TYPE inval;
- while (!indata.eof() ) {
- indata >> inval;
- base_array.push_back(inval);
- }
- }
- // Sort the input
- clock_t start, end;
- double elapsed;
- std::vector<boost::thread *> workers;
- start = clock();
- if (threadCount == 0) {
- if (loopCount > 1) {
- sort_loop(base_array, stdSort, loopCount);
- } else {
- sort_core(base_array, stdSort, loopCount);
- }
- threadCount = 1;
- } else {
- for (int i = 0; i < threadCount; ++i) {
- workers.push_back(new boost::thread(sort_loop, base_array, stdSort,
- loopCount));
- }
- for (int i = 0; i < threadCount; ++i) {
- workers[i]->join();
- delete workers[i];
- }
- }
- end = clock();
- elapsed = static_cast<double>(end - start) ;
- printf("for %lu strings\n", base_array.size());
- if (stdSort)
- printf("std::sort clock time %lf\n", elapsed/CLOCKS_PER_SEC/threadCount);
- else
- printf("spreadsort clock time %lf\n", elapsed/CLOCKS_PER_SEC/threadCount);
- return 0;
- }
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