title: What is the most efficient thread-safe C++ logger?
body: <p>I am working on a performance critical multi-threaded application. I looked at rlog, Ace and Boost logging. I chose rlog because I read it was the fastest (when logging is disabled, it has the least overhead).</p>
  
  <p>The problem I have is it shows the file name, line number etc. even in release mode. If you can tell me how to shut that information off, my problem might be solved. In any case what is the most efficient logger in C++ for my situation?</p>