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I'm attempting to profile some c++ code on my mac (os x Lion) and I haven't been able to find anything useful. I'm looking for a profiler that will tell me what functions are taking up my cpu time (similar to the matlab profiler).
Here is what I have tried
- gprof. This is what I use on my linux machine, but it just gives me empty output on my mac (apparently a known problem)
- Instruments. I can't for the life of me figure out how to profile anything within my compiled binary. Nor can I find any sort of useful tutorial.
- (other searching revealed Shark, which is no longer available and Valgrind which is for memory).
Really appreciate the help!
fogesfoges3 Answers
Instruments is the tool to use. A full explanation of Instruments is outside the scope of this answer, but here's a quick start guide:
- Open Instruments.1
- Select the 'Time Profiler' template.
- Select your application in the 'Target' dropdown menu.2
- Hit the red circle ('record') button to start your application running.
- If applicable, do some stuff in your application that you need to profile.
- Hit the record button again to stop recording.
- Use the tools in Instruments to analyze your results.
Of the tools available, the ones that will be most frequently useful are:
- Expanding the call tree using the disclosure arrows
- Clicking the circled arrow on a function name to focus it
- Double-clicking a function to view the associated source
- The 'Invert Call Tree' checkbox on the left-hand side
1 One easy way to open Instruments is to use Spotlight: Just click on the magnifying glass in the upper right corner of the taskbar (next to the clock) and type 'Instruments'.
2 Click 'Choose Target...' and navigate to the path of your executable.
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Instruments really is the right answer, but if you can't figure out how to use it then another option is the profiler in the built-in Activity Monitor application. In Activity Monitor you can get info on any running process and there's a button to sample its execution for a while. You'll have to start your program, switch to Activity Monitor, find the process, and then sample it.
Additionally you can do 'poor man's profiling' simply by running the program in a debugger and pausing it manually half a dozen times or so and noting the call stack at those times. It's very simple but it works surprisingly well as a first pass for a significant fraction of programs.
bames53bames53Instruments is the tool to use.To overcome the issue of the blank traces, make sure that you open Instruments from within XCode:
If you open Instruments from an old Instruments icon that you pinned to your dock before the last update to XCode, it will give you blank traces.
