In this article, we will explore the GNU profiling tool ‘gprof’. In this step, the gprof tool is run with the executable name and the above. What is gprof? Gprof is a profiling program which collects and arranges statistics on your programs. Write hate-mail to gnu (but don’t tell them I told you to). Table of Contents. 1. Introduction to Profiling · 2. Compiling a Program for Profiling · 3. Executing the Program · 4. gprof Command Summary · Output Options.

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It used a hybrid of instrumentation and sampling [1] and was created as an extended version of the older “prof” tool.

I think point 10 is exactly what I was getting at: There is also an estimate of how much time was spent in the subroutines of each function. Why would the profiling version hang up at the end of program execution like that? Just mentioning that because I see that complaint a lot.

Table of Contents

Bugs listed are irrelevant as again, just because something has a problem does not mean it gmu useless or never useful in any way shape or form. The man page, by the way, suggests this:. The man g;rof, by the way, suggests this: Also, I agree that recursion is not all that difficult.

Sorry for bad English and thank you very much for this article. As you would have already seen that gprof produces output with lot of verbose information so in case this information is not required then this can be achieved using the -b flag. Not to be confused with the perfect hash function generator gperf.


On the other hand, call graph focuses on each function like the functions through which a particular function was called, what all functions were called from within this particular function etc So this way one can get idea of the execution time spent in the sub-routines too.

It produced the gmon. Vivek Kumar December 30,9: I think it is better to make bigger time discrete in functions. Gproff Read Edit View history.

Gprof – Wikipedia

In other words, in the hands of an experienced programmer, it is a very valuable tool for exactly what you claim it isn’t good for. Responding to your revised third paragraph: The second part of the output is the textual call graph, which shows for each function who called it parent and who it called child subroutines.

Thanks and it is very simple. Mark Richter February 28,bprof I have followups enabled so if g;rof respond maybe I can help more. Okay, make that two questions three if you count the previous one as two: Also, if there is a requirement to print flat profile but excluding a particular function then this is also possible using -P flag by passing the function name to exclude along with it.

Sampling is done vprof probing the target program’s program counter at regular intervals using operating system interrupts programmed via profil 2 or setitimer glrof syscalls. The only reason I came here is I was trying to remember why gmon. The same goes the other way around too. Notify me of followup comments via e-mail. By using this site, you agree to the Terms of Use and Privacy Policy.


Oh no, the world is NOT perfect and only a fool would think otherwise or think that only perfection is valuable. Well your points are also valid. Anonymous July 30,6: Output is sorted by percentage, with hot spots at the top of the list. Glrof human eye can recognize similarities between state samples stack and data that no summarizing backend of any profiler has any hope of exposing to the user.

Function call counts are also reported.

A call to the monitor function ‘mcount’ is inserted before each function call. So we see that a flat profile containing information related to only function func1 is displayed.

GPROF Tutorial – How to use Linux GNU GCC Profiling Tool

The flat profile gives the total execution time spent in each function and its percentage of the total running time. In a large application like yours, Unlike prof, gprof is capable of limited call graph collecting and printing.

Mike Dunlavey February 28,7: