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C++小白实习日记——Day 1 怎么跑github上下载的程序

article 2024/11/23 1:39:10

研二，通信专业，实习，记录一下实习经历

在本地服务器跑github代码：

第一天老板给了一个github上的小项目链接让我看：

https://github.com/MengRao/tscns

用git clone 命令下载下来，文件夹下有这些：

我直接在clion中打开项目，设置添加配置为c/c++文件，源文件选择tscns_test.cc文件,运行tscns_test.cc,此时程序是在本地跑的，工具链默认为MinGW，可以看到本地跑是ok的

/*
MIT License

Copyright (c) 2022 Meng Rao <raomeng1@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include <iostream>
#include <iomanip>
#include <chrono>
#include <thread>
#include "tscns.h"

using namespace std;

TSCNS tn;

int main(int argc, char** argv) {
  tn.init();
  cout << std::setprecision(15) << "init tsc_ghz: " << tn.getTscGhz() << endl;

  double rdns_latency;
  {
    const int N = 1000;
    int64_t tmp = 0;
    int64_t t0 = tn.rdsysns();
    for (int i = 0; i < N; i++) {
      tmp += tn.rdsysns();
    }
    int64_t t1 = tn.rdsysns();
    for (int i = 0; i < N; i++) {
      tmp += tn.rdtsc();
    }
    int64_t t2 = tn.rdsysns();
    for (int i = 0; i < N; i++) {
      tmp += tn.rdns();
    }
    int64_t t3 = tn.rdsysns();
    // rdsys_latency is actually a low bound here as it's measured in a busy loop
    double rdsys_latency = (double)(t1 - t0) / (N + 1);
    double rdtsc_latency = (double)(t2 - t1 - rdsys_latency) / N;
    rdns_latency = (double)(t3 - t2 - rdsys_latency) / N;
    cout << "rdsys_latency: " << rdsys_latency << ", rdtsc_latency: " << rdtsc_latency
         << ", rdns_latency: " << rdns_latency << ", tmp: " << tmp << endl;
  }

  while (true) {
    int64_t a = tn.rdns();
    tn.calibrate();
    int64_t b = tn.rdns();
    int64_t c = tn.rdsysns();
    int64_t d = tn.rdns();
    int64_t b2c = c - b;
    int64_t c2d = d - c;
    int64_t err = 0;
    if (b2c < 0)
      err = -b2c;
    else if (c2d < 0)
      err = c2d;
    // calibrate_latency should not be a large value, especially not negative
    int64_t calibrate_latency = b - a - (int64_t)rdns_latency;
    int64_t rdsysns_latency = d - b - (int64_t)rdns_latency;
    cout << "calibrate_latency: " << calibrate_latency << ", tsc_ghz: " << tn.getTscGhz()
         << ", b2c: " << b2c << ", c2d: " << c2d << ", err: " << err
         << ", rdsysns_latency: " << rdsysns_latency << endl;
    auto expire = tn.rdns() + tn.NsPerSec / 2;
    while (tn.rdns() < expire) std::this_thread::yield();
  }

  return 0;
}