Goma Wiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.

=====計算時間=====

自分のコードが遅い場合にプログラムの処理のどの部分が遅いかを確認する方法\\
いくつもあるが，chrono を使ったものを紹介しておく．

<code cpp TestChrono.cpp>
#include <iostream>
#include <chrono>

int main ( int argc, char* argv[] ) {

  auto time1 = std::chrono::system_clock::now();

  // 処理1

  auto time2 = std::chrono::system_clock::now();

  // 処理2
  
  auto time3 = std::chrono::system_clock::now();
  
  std::cout << "処理1" << std::endl;
  std::cout << std::chrono::duration_cast<std::chrono::nanoseconds>(time2 - time1).count() << std::endl;
  std::cout << "処理2" << std::endl;
  std::cout << std::chrono::duration_cast<std::chrono::nanoseconds>(time3 - time2).count() << std::endl;
  
  std::exit(0);

}
</code>

Goma Wiki

User Tools

Site Tools

Page Tools