Logging from multiple threads using glog

glog-performance-test.cpp

#include <glog/logging.h>
#include <boost/thread.hpp>
#include <boost/chrono.hpp>
#include <iostream>

void logger()
{
  int num = 1000000;
  auto tid = boost::this_thread::get_id();
  auto before = boost::chrono::system_clock::now();
  for(int i = 0; i < num; i++)
    LOG(INFO) << "Logged " << i << "-th time from " << tid;
  auto now = boost::chrono::system_clock::now();
  auto duration =
        boost::chrono::duration_cast<boost::chrono::milliseconds>(now - before);
  std::cout << "Time taken to log 1 million lines is " << duration.count() << " milliseconds by thread " << tid << std::endl;
  LOG(INFO) << "Time taken to log 1 million lines is " << duration.count() << " milliseconds by thread " << tid;
}

int main(int argc, char* argv[]) {
  // Initialize Google's logging library.
  //FLAGS_log_dir = "/var/tmp/test/logs"; // Sets log destination
  google::SetLogDestination(google::INFO, "/var/tmp/test/logs/file.log"); // Sets log destination and filename
  google::InitGoogleLogging(argv[0]);

  boost::thread t1{logger};
  boost::thread t2{logger};
  boost::thread t3{logger};
  t1.join();
  t2.join();
  t3.join();
}

Build: g++ -std=c++11 glog-performance-test.cpp -lglog -lboost_system -lboost_chrono -lboost_thread -lpthread -o glog-performance-test