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