[Freeswitch-users] Profiling FreeSwitch?

Are there any tools already in use for profiling FreeSwitch? That is, getting statistics on how often various procedures are called, and how much processor time they take, etc. Being a linux noob, I spent hours looking at "gprof", and when I finally got it working, I learned that it doesn't handle multi-threaded apps like FS. Is there a recommended tool that people are already using? Or should I just add my own logging code and recompile?