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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. |
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