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 flat profile gives the total execution time spent in each function and its percentage of the total running time.
GPROF Tutorial – How to use Linux GNU GCC Profiling Tool
The mcount function may not be thread-safe in some implementations, so multi-threaded application profiles can be incorrect typically it only profiles tnu main thread of application. Support Us Support this blog by purchasing one of my ebooks. Rewording 3rd from last paragraph: Andreas August 25,2: Notify me of followup comments via e-mail.
Table of Contents
This never happens when the non-profiling version is run. Read more about Ramesh Natarajan and the blog. In this first step, we need to make sure that the profiling is enabled when the compilation of the code is done. Thanks and it is very gpeof. Do you have any idea why? Several gmon files can be combined with ‘gprof -s’ to accumulate data from several runs of a program. Function call counts are also reported. Cody February 27,7: Antoha Bikineev October 30, The 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.
I take it that no one knows why a -pg program just hangs gprfo the end of execution? So you need it to exit from program termination normal termination. That invocation counting is useful as opposed to getting inclusive time percent. Sampling data is saved in ‘gmon.
Use this Contact Form to get in touch me with your comments, questions or suggestions about this site. Just mentioning that because I see that complaint a lot.
It used a hybrid of instrumentation and sampling  and was created as an extended version of the older “prof” tool.
Will B June 2,1: Unlike prof, gprof is capable of limited call graph collecting and printing. 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 for this great article!
There is also an estimate of how much time was spent in the subroutines of each function. Generate extra code to write profile information suitable for the analysis program gprof.
GNU gprof – Table of Contents
While flat profile gives an overview of the timing information of the functions like time consumption for the execution of a particular function, how many times it was called etc. In flat profile we expect that func1 works longer than func2.
Anyway, as for why it would hang, a question and a suggestion on figuring out where its having issues:.