logging

NOTE

You need a compiler which support C++17 (at least C++11).

For those who has C++11 support, here's a trick to simualte inline variable of C++17. You need modifiy the source for example:

template<typename T = void>
class Logger
{
  private:
    thread_local static StreamBuffer ss_;
};

template<typename T> thread_local StreamBuffer Logger<T>::ss_{};

#define LOG_INFO nm::Logger<>(__FILE__, __LINE__, nullptr, nm::Logger<>::INFO)

and you have to create a logging instance using nm::Logger<>::create_sync().

benchmark

bench.cc

5400RPM HDD + i5 6300HQ

$ g++ bench.cc -pthread -O3
$ ./a.out
0.376758861s
$ du -h *.log
92M xx.log

speed ≈ 244 M/s

TODO

如果glibc足够新的话，可以使用固定大小的mpsc队列来去除内存分配的开销(主要是看glibc的memcpy是否能启用指令加速)