111 lines
5.9 KiB
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111 lines
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<title>Analysis Options - GNU gprof</title>
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<link rel="prev" href="Output-Options.html#Output-Options" title="Output Options">
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This file documents the gprof profiler of the GNU system.
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<p>
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<a name="Analysis-Options"></a>Next: <a rel="next" accesskey="n" href="Miscellaneous-Options.html#Miscellaneous-Options">Miscellaneous Options</a>,
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Previous: <a rel="previous" accesskey="p" href="Output-Options.html#Output-Options">Output Options</a>,
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Up: <a rel="up" accesskey="u" href="Invoking.html#Invoking">Invoking</a>
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<hr><br>
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</div>
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<h3 class="section">4.2 Analysis Options</h3>
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<dl>
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<dt><code>-a</code><dt><code>--no-static</code><dd>The <span class="samp">-a</span> option causes <code>gprof</code> to suppress the printing of
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statically declared (private) functions. (These are functions whose
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names are not listed as global, and which are not visible outside the
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file/function/block where they were defined.) Time spent in these
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functions, calls to/from them, etc., will all be attributed to the
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function that was loaded directly before it in the executable file.
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<!-- This is compatible with Unix @code{gprof}, but a bad idea. -->
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This option affects both the flat profile and the call graph.
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<br><dt><code>-c</code><dt><code>--static-call-graph</code><dd>The <span class="samp">-c</span> option causes the call graph of the program to be
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augmented by a heuristic which examines the text space of the object
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file and identifies function calls in the binary machine code.
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Since normal call graph records are only generated when functions are
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entered, this option identifies children that could have been called,
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but never were. Calls to functions that were not compiled with
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profiling enabled are also identified, but only if symbol table
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entries are present for them.
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Calls to dynamic library routines are typically <em>not</em> found
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by this option.
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Parents or children identified via this heuristic
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are indicated in the call graph with call counts of <span class="samp">0</span>.
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<br><dt><code>-D</code><dt><code>--ignore-non-functions</code><dd>The <span class="samp">-D</span> option causes <code>gprof</code> to ignore symbols which
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are not known to be functions. This option will give more accurate
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profile data on systems where it is supported (Solaris and HPUX for
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example).
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<br><dt><code>-k </code><var>from</var><code>/</code><var>to</var><dd>The <span class="samp">-k</span> option allows you to delete from the call graph any arcs from
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symbols matching symspec <var>from</var> to those matching symspec <var>to</var>.
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<br><dt><code>-l</code><dt><code>--line</code><dd>The <span class="samp">-l</span> option enables line-by-line profiling, which causes
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histogram hits to be charged to individual source code lines,
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instead of functions. This feature only works with programs compiled
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by older versions of the <code>gcc</code> compiler. Newer versions of
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<code>gcc</code> are designed to work with the <code>gcov</code> tool instead.
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<p>If the program was compiled with basic-block counting enabled,
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this option will also identify how many times each line of
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code was executed.
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While line-by-line profiling can help isolate where in a large function
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a program is spending its time, it also significantly increases
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the running time of <code>gprof</code>, and magnifies statistical
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inaccuracies.
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See <a href="Sampling-Error.html#Sampling-Error">Statistical Sampling Error</a>.
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<br><dt><code>-m </code><var>num</var><dt><code>--min-count=</code><var>num</var><dd>This option affects execution count output only.
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Symbols that are executed less than <var>num</var> times are suppressed.
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<br><dt><code>-n</code><var>symspec</var><dt><code>--time=</code><var>symspec</var><dd>The <span class="samp">-n</span> option causes <code>gprof</code>, in its call graph analysis,
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to only propagate times for symbols matching <var>symspec</var>.
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<br><dt><code>-N</code><var>symspec</var><dt><code>--no-time=</code><var>symspec</var><dd>The <span class="samp">-n</span> option causes <code>gprof</code>, in its call graph analysis,
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not to propagate times for symbols matching <var>symspec</var>.
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<br><dt><code>-z</code><dt><code>--display-unused-functions</code><dd>If you give the <span class="samp">-z</span> option, <code>gprof</code> will mention all
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functions in the flat profile, even those that were never called, and
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that had no time spent in them. This is useful in conjunction with the
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<span class="samp">-c</span> option for discovering which routines were never called.
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</dl>
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</body></html>
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