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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The amount of error gprf usually more than one sampling period. Thank you very much, keep up the good work! Thanks and it is very simple. Sameer March 11,1: Mark Richter February 28,5: Rasna October 17, The mcount function may not be thread-safe in some implementations, so multi-threaded application profiles can be incorrect typically it only profiles the main thread of application.

Anonymous July 30,6: Mike Dunlavey February 14, glrof, 6: Responding to your revised third paragraph: I have followups enabled so if you respond maybe I can help more. Ehsan March 16,7: The flat profile is mainly about self time, which in a large program is usually irrelevant because the real problems are mid-stack.


Table of Contents

Not to be confused with the perfect hash function generator gperf. What about cases where i need to know the time spent by each routine in nano seconds precession? In flat profile we expect that func1 works longer than func2.

In a large application like yours, Hi Is it possible to set the gmon. Mike Dunlavey February 28,8: Sorry for bad English and thank you very much for this article. I could go into greater detail on any of these if necessary.

One final note is that it is almost always not a system library bug when you see something hanging or crashing in a system library e. It produced the gmon. From GProf to DTrace “2.

Retrieved from ” https: Mike Dunlavey February 28,7: Say for gprpf performance applications. Vivek Kumar December 30,9: GPROF is not very good for what you need.

I take it that no one knows why a -pg program just hangs at the end of execution? A Selection, Kathryn S. Use this Contact Form to get in touch me with your comments, questions or suggestions about this site.


Gprof – Wikipedia

A call to the monitor function ‘mcount’ is inserted before each function call. You can think the software is as fast as possible, when in fact it could be much faster. All rights reserved Terms of Service. This produces an analysis file which contains all the desired profiling information.

GPROF Tutorial – How to use Linux GNU GCC Profiling Tool

The second part of the output is the textual call graph, which shows gproff each function who called it parent and who it called child subroutines. GPROF output consists of two parts: Bugs listed are irrelevant as again, just because something has a problem does not mean it is useless or never useful in any way shape or form.

Sampling is done by probing the target program’s program counter at regular intervals using operating system interrupts programmed via profil 2 or setitimer 2 syscalls. Also, I agree that recursion is not all that difficult.