unix% gprof program-name [ data-file ] [ > output-file ] Following the gprof command with “> output-file” causes the output of gprof to be saved to output-file so. Gprof is a profiling program which collects and arranges statistics on your lly, it looks into each of your functions and inserts code at the head. Gprof is a performance analysis tool used to profile applications to determine where time is spent . Searching the Web will turn up Gprof tutorials and more.

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EECS gprof Quick-Start Guide

This is useful if you intend to print out the output, g;rof are tired of seeing the blurbs. Here’s how I launched the binary in my case: That self time matters as opposed to inclusive time, which includes self time. The next step is to launch that executable.

The -I option specifies a list of search directories in which to find source files. The -A option causes gprof to print annotated source code.

Also, I agree that recursion is not all that difficult. Specifying any of these options overrides the default -p -qwhich prints a flat profile and call graph analysis for all functions. Anyway, as for why it would hang, a question and a suggestion on figuring out tutorixl its having issues: Read more about Ramesh Natarajan and the blog.

Here’s the flat profile in my case:. Well your points are also valid. The -t option causes the num most active source lines in each source file to be listed when source annotation is enabled. So, now use the Gprof thtorial in the following way:.


Thank you very much, keep up the good work!

Thanks for this great article! This produces an analysis file which contains all the desired profiling information. If broken gorof to the last bit, performance testing effectively tests how much time a particular piece of code – say a function – is consuming. The -i option causes gprof to display summary information about the profile data file s and then exit.

Anything else that is different should be kept in mind too including — just saying and not suggesting this is it — system load. You can think the software is as fast as possible, when in fact it could be much faster.

But since we’ve to profile the code tuorial Gprof, I’ll have to use the -pg command line option provided by the gcc compiler. The only reason I came here is I was trying to remember why gmon. Also, your program needs to have sufficient permissions for gmon.

What Gprof basically does is, it calculates the amount of time spent in each routine or function. Log in or Sign up.

GPROF Tutorial – How to use Linux GNU GCC Profiling Tool

If all this sounds a bit confusing at this point especially the part in quotesdon’t worry, as we’ll make things clear through an example. 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. Kiranjp September 3,1: The -C option causes gprof to print a tally of functions and the number of times each was called.


It is easy to use,clearly and instructive. The -J option causes gprof not to print annotated source code. Following test code will be used throughout the article:. The -p option causes gprof to print a flat profile. The -T option causes gprof to print its output in traditional BSD style.

Rasna October 17, There is also an estimate of how much time was spent in the subroutines of each function.

Contact Us Email Me: If symspec is specified, print output only for matching symbols. This option suggests an ordering which may improve paging, tlb and cache behavior for the program on systems which do not support arbitrary ordering of functions in an executable.

gprof – Unix, Linux Command

Okay, make that two questions tjtorial if you count the previous one as two: By default, only the lines at the beginning of a basic-block are annotated. The -s option causes gprof to summarize the information in the profile data files it read in, and write out a profile data file called gmon. The individual columns for the flat profile as well as call graph are very well explained in the output itself.

That accuracy of measurement is important tutlrial opposed to accuracy of identifying speedup opportunities.