gperftools.md

    #include <algorithm>
    #include <random>
    #include <string>
    #include <vector>
    
    int main()
    {
      std::vector<std::string> vec;
      std::mt19937_64 gen(43);
    
      for (int count = 0; count < 3; ++count)
      {
        for (int i = 0; i < 10 * 1000 * 1000; ++i)
        {
          char buf[64];
          snprintf(buf, sizeof buf, "%016lx", gen());
          vec.push_back(buf);
        }
        std::sort(vec.begin(), vec.end());  // 如果用 tcmalloc 2.5，这行注释掉反而会变慢！
        vec.clear();
      }
    }

• Link your executable with -lprofiler

    g++ -std=c++11 -O2 -Wall -g -lprofiler main.cpp
  

• Run your executable with the CPUPROFILE environment var set:

   CPUPROFILE=/tmp/prof.out <path/to/binary> [binary args]
  

• Install gv

    sudo yum -y install gv graphviz
  

• Run pprof to analyze the CPU usage

   pprof <path/to/binary> /tmp/prof.out      # -pg-like text output
   pprof --gv <path/to/binary> /tmp/prof.out # really cool graphical output