March 11, 2019 posted by

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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Mike Dunlavey October 2,1: There are various flags available to customize the output of the gprof tool. That recursion is a tricky confusing issue it only is a problem when trying to construct an annotated call graph. Support Us Support this blog by purchasing one of my ebooks.

My focus is to write articles that will either teach you or help you resolve a problem. Antoha Bikineev October 30, Just mentioning that because I see that complaint a lot. Anyway, as for why it would hang, a question and a suggestion on figuring out where its having issues:. Cody February 27,7: Notify me of followup comments via e-mail. From GProf to DTrace “2. Andreas August 25,2: Thanks and it is very simple. Rewording 3rd from last paragraph: Also, I agree that recursion is not all that difficult.


Anything else that is different should be kept in mind too including — just saying and not suggesting this is it — system load.

I take it that no one knows why a -pg program just hangs at the end of execution? Thank you very much, keep up the good work! At run-time, timing values are obtained by statistical sampling. Webarchive template wayback links.

Will B June 2,1: 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.

Do you have any idea why? Function call counts are also reported.

Table of Contents

Views Read Edit View history. The same goes the other way around too. Mark Richter February 13,gmu This helps make your program execution faster which is always desired.

The individual columns for the flat profile as well as call graph are very well explained in the output itself. Mutual recursion and non-trivial cycles gprlf not resolvable by the gprof approach context-insensitive call graphbecause it only records arc traversal, not full call chains. The call graph shows, for each function, which functions called it, which other functions it called, and how many times.

In the second step, the binary file produced as a result of step-1 above is executed so gprif profiling information can be generated. You can also simply drop me a line to say hello!.


GNU gprof – Table of Contents

Why would the profiling version hang up at the end of program execution like that? Hi Cody, You raise a lot of valid points, but let me itemize my objections to gprof.

This produces an analysis file which contains all the desired profiling information. The man page, by the way, suggests this: Lets try and understand the three steps listed above through a practical example. All rights reserved Terms of Service.

This file contains a couple of tables flat profile and call graph in gprfo to some other information. In a large application like yours, The resulting data is not exact, rather a statistical approximation.

GPROF Tutorial – How to use Linux GNU GCC Profiling Tool

The only reason I came here is I was trying to remember why gmon. Well, I ran the proram again, and this time it produced the gmon. Hopefully that clears up any points from my end you did indeed clear up your points and I — besides being surprised you grpof to me responding from your response from — appreciate it.