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- <a name="Executing"></a>
- <div class="header">
- <p>
- Next: <a href="Invoking.html#Invoking" accesskey="n" rel="next">Invoking</a>, Previous: <a href="Compiling.html#Compiling" accesskey="p" rel="prev">Compiling</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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- <a name="Executing-the-Program"></a>
- <h2 class="chapter">3 Executing the Program</h2>
-
- <p>Once the program is compiled for profiling, you must run it in order to
- generate the information that <code>gprof</code> needs. Simply run the program
- as usual, using the normal arguments, file names, etc. The program should
- run normally, producing the same output as usual. It will, however, run
- somewhat slower than normal because of the time spent collecting and
- writing the profile data.
- </p>
- <p>The way you run the program—the arguments and input that you give
- it—may have a dramatic effect on what the profile information shows. The
- profile data will describe the parts of the program that were activated for
- the particular input you use. For example, if the first command you give
- to your program is to quit, the profile data will show the time used in
- initialization and in cleanup, but not much else.
- </p>
- <p>Your program will write the profile data into a file called <samp>gmon.out</samp>
- just before exiting. If there is already a file called <samp>gmon.out</samp>,
- its contents are overwritten. There is currently no way to tell the
- program to write the profile data under a different name, but you can rename
- the file afterwards if you are concerned that it may be overwritten.
- </p>
- <p>In order to write the <samp>gmon.out</samp> file properly, your program must exit
- normally: by returning from <code>main</code> or by calling <code>exit</code>. Calling
- the low-level function <code>_exit</code> does not write the profile data, and
- neither does abnormal termination due to an unhandled signal.
- </p>
- <p>The <samp>gmon.out</samp> file is written in the program’s <em>current working
- directory</em> at the time it exits. This means that if your program calls
- <code>chdir</code>, the <samp>gmon.out</samp> file will be left in the last directory
- your program <code>chdir</code>’d to. If you don’t have permission to write in
- this directory, the file is not written, and you will get an error message.
- </p>
- <p>Older versions of the <small>GNU</small> profiling library may also write a file
- called <samp>bb.out</samp>. This file, if present, contains an human-readable
- listing of the basic-block execution counts. Unfortunately, the
- appearance of a human-readable <samp>bb.out</samp> means the basic-block
- counts didn’t get written into <samp>gmon.out</samp>.
- The Perl script <code>bbconv.pl</code>, included with the <code>gprof</code>
- source distribution, will convert a <samp>bb.out</samp> file into
- a format readable by <code>gprof</code>. Invoke it like this:
- </p>
- <div class="smallexample">
- <pre class="smallexample">bbconv.pl < bb.out > <var>bh-data</var>
- </pre></div>
-
- <p>This translates the information in <samp>bb.out</samp> into a form that
- <code>gprof</code> can understand. But you still need to tell <code>gprof</code>
- about the existence of this translated information. To do that, include
- <var>bb-data</var> on the <code>gprof</code> command line, <em>along with
- <samp>gmon.out</samp></em>, like this:
- </p>
- <div class="smallexample">
- <pre class="smallexample">gprof <var>options</var> <var>executable-file</var> gmon.out <var>bb-data</var> [<var>yet-more-profile-data-files</var>…] [> <var>outfile</var>]
- </pre></div>
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- <p>
- Next: <a href="Invoking.html#Invoking" accesskey="n" rel="next">Invoking</a>, Previous: <a href="Compiling.html#Compiling" accesskey="p" rel="prev">Compiling</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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