mirror of
https://github.com/zeromq/libzmq.git
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132 lines
4.3 KiB
C++
132 lines
4.3 KiB
C++
/*
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Copyright (c) 2018 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if __cplusplus >= 201103L
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#include "radix_tree.hpp"
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#include "trie.hpp"
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#include <chrono>
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#include <cstddef>
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#include <cstdio>
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#include <random>
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#include <ratio>
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#include <vector>
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const std::size_t nkeys = 10000;
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const std::size_t nqueries = 1000000;
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const std::size_t warmup_runs = 10;
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const std::size_t samples = 10;
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const std::size_t key_length = 20;
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const char *chars = "abcdefghijklmnopqrstuvwxyz0123456789";
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const int chars_len = 36;
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template <class T>
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void benchmark_lookup (T &subscriptions_,
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std::vector<unsigned char *> &queries_)
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{
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using namespace std::chrono;
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std::vector<duration<long, std::nano> > samples_vec;
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samples_vec.reserve (samples);
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for (std::size_t run = 0; run < warmup_runs; ++run) {
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for (auto &query : queries_)
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subscriptions_.check (query, key_length);
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}
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for (std::size_t run = 0; run < samples; ++run) {
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duration<long, std::nano> interval (0);
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for (auto &query : queries_) {
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auto start = steady_clock::now ();
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subscriptions_.check (query, key_length);
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auto end = steady_clock::now ();
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interval += end - start;
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}
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samples_vec.push_back (interval / queries_.size ());
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}
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std::size_t sum = 0;
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for (const auto &sample : samples_vec)
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sum += sample.count ();
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std::printf ("Average lookup time = %.1lf ns\n",
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static_cast<double> (sum) / samples);
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}
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int main ()
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{
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// Generate input set.
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std::minstd_rand rng (123456789);
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std::vector<unsigned char *> input_set;
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std::vector<unsigned char *> queries;
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input_set.reserve (nkeys);
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queries.reserve (nqueries);
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for (std::size_t i = 0; i < nkeys; ++i) {
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unsigned char *key = new unsigned char[key_length];
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for (std::size_t j = 0; j < key_length; j++)
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key[j] = static_cast<unsigned char> (chars[rng () % chars_len]);
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input_set.emplace_back (key);
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}
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for (std::size_t i = 0; i < nqueries; ++i)
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queries.push_back (input_set[rng () % nkeys]);
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// Initialize both data structures.
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//
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// Keeping initialization out of the benchmarking function helps
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// heaptrack detect peak memory consumption of the radix tree.
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zmq::trie_t trie;
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zmq::radix_tree_t radix_tree;
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for (auto &key : input_set) {
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trie.add (key, key_length);
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radix_tree.add (key, key_length);
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}
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// Create a benchmark.
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std::printf ("keys = %llu, queries = %llu, key size = %llu\n",
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static_cast<unsigned long long> (nkeys),
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static_cast<unsigned long long> (nqueries),
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static_cast<unsigned long long> (key_length));
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std::puts ("[trie]");
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benchmark_lookup (trie, queries);
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std::puts ("[radix_tree]");
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benchmark_lookup (radix_tree, queries);
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for (auto &op : input_set)
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delete[] op;
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}
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#else
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int main ()
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{
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}
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#endif
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