Mutex speed tests

Shared mutex speed test

Code

// clang++-4.0 -o main main.cpp -O3 -std=c++14 -lboost_system -lboost_thread -lpthread && ./main

#include <mutex>
#include <shared_mutex>
#include <chrono>
#include <iostream>
#include <thread>
#include <boost/thread/shared_mutex.hpp>

void escape(void* p) {
  asm volatile("" : : "g"(p) : "memory");
}


template <typename F>
void test(F &&fun) {
auto start = std::chrono::steady_clock::now();
	for (int i = 0; i < 10000000; i++) {
		fun();
	}
	auto end = std::chrono::steady_clock::now();
	auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count();
	std::cout << ms << '\n';
}


int main() {
	std::cout << "BOOST shared mutex\n";
	std::cout << "lock shared\n";
	boost::shared_mutex shared_mtx;
	test([&shared_mtx]{
		shared_mtx.lock_shared();
		shared_mtx.unlock_shared();

	});


	std::cout << "lock\n";
	test([&shared_mtx]{
		shared_mtx.lock();
		shared_mtx.unlock();

	});



	std::cout << "STD mutex\n";
	std::cout << "lock\n";
	std::mutex mtx;
	test([&mtx]{
		mtx.lock();
		mtx.unlock();

	});

	std::cout << "STD shared_timed_mutex\n";
	std::cout << "lock\n";
	std::shared_timed_mutex st_mtx;
	test([&st_mtx]{
		st_mtx.lock();
		st_mtx.unlock();

	});

	std::cout << "lock shared\n";
	test([&st_mtx]{
		st_mtx.lock_shared();
		st_mtx.unlock_shared();

	});
}

Results

Object type	Operation	Time
std::mutex	lock() + unlock()	296
std::shared_timed_mutex	lock() + unlock()	447
boost::shared_mutex	lock() + unlock()	1556
std::shared_timed_mutex	lock_shared() + unlock_shared()	491
boost::shared_mutex	lock_shared() + unlock_shared()	1587