Question

I wrote a daemon using the python-daemon library. And it uses about 20% of CPU all the time. Can I somehow check which part of the program uses all this CPU time cause well it actually just waits for userinput? Help is as always much appreciated!

My daemon is started:

python file1:

context = daemon.DaemonContext()
context.pidfile = PidFile(pidfile)
with context:
    module.run()

python file2:

def run():
    end = threading.Event()
    # Do something here then:
    try:
        while not end.isSet():
        # Do some more stuff

    except KeyboardInterrupt, SystemExit:
        pass
    # Except some more stuff 

** EDIT

Maybe you could help me again, now I ran a profiler but can’t really tell who the “baddie” is. Here is my profile results

Answer 1

You can attach a Python profiler to your software:

http://docs.python.org/library/profile.html

… and make the profiler start when the daemon is started. Then let the profiler collect profiling information a while and use a signal sent to process (e.g. SIGUSR1) to make your deamon to dump the profiling data to a file.

http://docs.python.org/library/signal.html

…or alternative write profiling log when the process exits at atexit handler.

Then you can read this file and see which function has most cumulative CPU usage.