Re: [linux-audio-user] profiling

On Wed, Dec 07, 2005 at 07:13:30 -0800, Noah Roberts wrote: IIRC gprof works by sampling program activity at some interval. My experience with realtime code is that it doesnt spend long enough doing anything in particular to get meaningful results. I think you will get better results by using cachegrind et al and running in freewheel mode so it doesn't get kicked off. Failing that you can write your own profiling code reasonably easily, just use gettimeofday before and after ciritcal sections, and sum the results from each run. The (ugly and scrappy, but largely automatic) code I use is here: http://cvs.sourceforge.net/viewcvs.py/*checkout*/threestore/threestore-v3/s… http://cvs.sourceforge.net/viewcvs.py/*checkout*/threestore/threestore-v3/s… Just uncomment the #define TIMING line to enable it, call TIME(NULL) to initialise or reset, and TIME("label") at each checkpoint. At the end of your run call TIME(TS_TIMING_REPORT) and it will print the total time spent in each section, and some stats. Don't rely on it for anything critically important though, the code is pretty unsafe, and can have a heisenberg effect if cache utility is important to your code and you call TIME too often. - Steve