Gprof is a performance analysis tool for Unix applications. It used a hybrid of instrumentation Another implementation was written as part of the GNU project for GNU GPROF output consists of two parts: the flat profile and the call graph. Gprof is a profiling program which collects and arranges statistics on your lly, it looks Write hate-mail to gnu (but don’t tell them I told you to). If you are a programmer, who writes code in C, Pascal, or Fortran77 programming language and uses Linux as the development platform, youll be glad to.

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Armed with this information, now you’ll be in a better position to understand the data present in your profiling output file profile-data.

How to install and use profiling tool Gprof on Linux

Gprof is a performance analysis tool for Unix applications. The other columns in the output provide information on the total number of function calls made, and the time spent in each function. Else you can install it using the following command:. Your name or email address: So, we’ll start off with a C language program, which we’ll be profiling through Gprof. Unlike prof, gprof is capable of limited call graph collecting and printing.

Comprehensive, affordable, and easy-to-use APM and infrastructure monitoring. Download and Install Gprof Gprof Usage. The amount of error is usually more than one sampling period.

Mutual recursion and non-trivial cycles are not resolvable by the gprof approach context-insensitive call graphbecause it only records arc traversal, not full call chains.

GNU gprof – Table of Contents

Log in or Sign up. If a value is n times the sampling period, the expected error in the value is the square root of n sampling periods.

But since we’ve to profile the code using Gprof, Proofiler have to use the -pg command line option provided by the gcc compiler.


First check whether or not the tool is already installed on your system. 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. So, what exactly is Gprof? GPROF output consists of two parts: By using this site, you agree to the Terms of Use and Privacy Policy. Consequently efforts to decrease the run-time of the program should concentrate on the former. If the program consists of more than one source file then the -pg option should be used when compiling each source file, and used again when linking the object files to create the final executable as shown above.

Here’s what the man page of Gprof says about information under these two sections:. It can be analyzed with gprof by giving the name of the executable as an argument:. Yes, my password is: At run-time, timing values are obtained by statistical sampling. Here’s the flat profile in my case:. From Wikipedia, the free encyclopedia.

Sampling data is saved in ‘gmon. If broken down to the last bit, performance testing effectively tests how much time a particular piece of code – say a function – is consuming. This page was last edited gprkf 21 Decemberat However, whatever we’ve covered here should be enough to get you started.

In profi,er tutorial, we’ll be discussing the details of how you can download, install, and use this tool.

There’s no doubt that testing is an integral and one of the most important aspects of the software development process. Needless to say, the best way to understand a tool like Gprof is through a practical example. The flat profile gives the total execution time spent in each function and its percentage of the total running time. In case you already use Gprof, and want to share something related to the tool with everyone here, just drop in a comment below.


Webarchive template wayback links. Retrieved from ” https: Not to be confused with the perfect hash function generator gperf. We will use gprof to examine the performance of a small numerical program which computes the lengths of sequences occurring in the unsolved Collatz conjecture in mathematics.

This creates an instrumented executable which contains additional instructions that record the time spent in each function.

Note that ideally I would have compiled the above code using the following command:. So, if through performance testing, we can enhance the performance of these functions in code, the overall performance of the software becomes better. It is this file which contains all the information that the Gprof tool requires to produce a human-readable profiling data. Function call counts are also reported.

From GProf to DTrace “2. To use profiling, the program must be compiled and linked with the -pg profiling option:. Now, moving on, the next step is to compile this code using thd.

And by testing, we don’t mean just testing the code for bugs – of course, bug detection is important as nobody would want their software to be buggy – performance of the code also equally matters these days. To do this, just run the following command in a terminal.

The source file ‘collatz. So, now use the Gprof tool in the proffiler way:. Once the command is executed, you’ll see that a file named gmon. Do you already have an account?

It used a hybrid of instrumentation and sampling [1] and was created as an extended version of the older “prof” tool. Additional output breaking down profileer run-time further is also produced by gprof but not shown here.