test sleep precision

test_rate_limiter.cpp

// Copyright (c) 2018 spockwang.
//     All rights reserved.
//
// Author: wbbtiger@gmail.com
//

#include <chrono>
#include <iostream>
#include <thread>

using namespace std;

int main()
{
    int wait_micros = 100;
    int cnt = 10*10000000 / wait_micros;
    auto start_time = std::chrono::steady_clock::now();
    for (int i = 0; i < cnt; ++i) {
        std::this_thread::sleep_for(std::chrono::microseconds(wait_micros));
    }
    auto end_time = std::chrono::steady_clock::now();
    auto duration_micros = std::chrono::duration_cast<std::chrono::microseconds>(end_time-start_time).count();
    cout << "avg micros=" << (duration_micros/cnt) << endl;
    return 0;
}