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<h2 class="chapter">8 Incompatibilities with Unix <code>gprof</code></h2>
<p><span class="sc">gnu</span> <code>gprof</code> and Berkeley Unix <code>gprof</code> use the same data
file <samp><span class="file">gmon.out</span></samp>, and provide essentially the same information. But
there are a few differences.
<ul>
<li><span class="sc">gnu</span> <code>gprof</code> uses a new, generalized file format with support
for basic-block execution counts and non-realtime histograms. A magic
cookie and version number allows <code>gprof</code> to easily identify
new style files. Old BSD-style files can still be read.
See <a href="File-Format.html#File-Format">Profiling Data File Format</a>.
<li>For a recursive function, Unix <code>gprof</code> lists the function as a
parent and as a child, with a <code>calls</code> field that lists the number
of recursive calls. <span class="sc">gnu</span> <code>gprof</code> omits these lines and puts
the number of recursive calls in the primary line.
<li>When a function is suppressed from the call graph with ‘<samp><span class="samp">-e</span></samp>’, <span class="sc">gnu</span>
<code>gprof</code> still lists it as a subroutine of functions that call it.
<li><span class="sc">gnu</span> <code>gprof</code> accepts the ‘<samp><span class="samp">-k</span></samp>’ with its argument
in the form ‘<samp><span class="samp">from/to</span></samp>’, instead of ‘<samp><span class="samp">from to</span></samp>’.
<li>In the annotated source listing,
if there are multiple basic blocks on the same line,
<span class="sc">gnu</span> <code>gprof</code> prints all of their counts, separated by commas.
<li>The blurbs, field widths, and output formats are different. <span class="sc">gnu</span>
<code>gprof</code> prints blurbs after the tables, so that you can see the
tables without skipping the blurbs.
</ul>
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