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<html xmlns:cf="http://docbook.sourceforge.net/xmlns/chunkfast/1.0"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>9.燣ackey: a simple profiler and memory tracer</title><link rel="stylesheet" href="vg_basic.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.69.0"><link rel="start" href="index.html" title="Valgrind Documentation"><link rel="up" href="manual.html" title="Valgrind User Manual"><link rel="prev" href="nl-manual.html" title='8.燦ulgrind: the "null" tool'><link rel="next" href="FAQ.html" title="Valgrind FAQ"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div><table class="nav" width="100%" cellspacing="3" cellpadding="3" border="0" summary="Navigation header"><tr><td width="22px" align="center" valign="middle"><a accesskey="p" href="nl-manual.html"><img src="images/prev.png" width="18" height="21" border="0" alt="Prev"></a></td><td width="25px" align="center" valign="middle"><a accesskey="u" href="manual.html"><img src="images/up.png" width="21" height="18" border="0" alt="Up"></a></td><td width="31px" align="center" valign="middle"><a accesskey="h" href="index.html"><img src="images/home.png" width="27" height="20" border="0" alt="Up"></a></td><th align="center" valign="middle">Valgrind User Manual</th><td width="22px" align="center" valign="middle"><a accesskey="n" href="FAQ.html"><img src="images/next.png" width="18" height="21" border="0" alt="Next"></a></td></tr></table></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="lk-manual"></a>9.燣ackey: a simple profiler and memory tracer</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="lk-manual.html#lk-manual.overview">9.1. Overview</a></span></dt><dt><span class="sect1"><a href="lk-manual.html#lk-manual.options">9.2. Lackey Options</a></span></dt></dl></div><p>To use this tool, you must specify<code class="computeroutput">--tool=lackey</code> on the Valgrindcommand line.</p><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="lk-manual.overview"></a>9.1.燨verview</h2></div></div></div><p>Lackey is a simple valgrind tool that does some basic programmeasurement. It adds quite a lot of simple instrumentation to theprogram's code. It is primarily intended to be of use as an exampletool.</p><p>It measures and reports various things.</p><div class="orderedlist"><ol type="1"><li><p>When command line option <code class="computeroutput">--basic-counts=yes</code> is specified, it prints the following statistics and information about the execution of the client program:</p><div class="orderedlist"><ol type="a"><li><p>The number of calls to <code class="computeroutput">_dl_runtime_resolve()</code>, the function in glibc's dynamic linker that resolves function references to shared objects.</p><p>You can change the name of the function tracekd with command line option <code class="computeroutput">--fnname=<name></code>.</p></li><li><p>The number of conditional branches encountered and the number and proportion of those taken.</p></li><li><p>The number of basic blocks entered and completed by the program. Note that due to optimisations done by the JIT, this is not really an accurate value.</p></li><li><p>The number of guest (x86, amd64, ppc, etc.) instructions and IR statements executed. IR is Valgrind's RISC-like intermediate representation via which all instrumentation is done. </p></li><li><p>Ratios between some of these counts.</p></li><li><p>The exit code of the client program.</p></li></ol></div></li><li><p>When command line option <code class="computeroutput">--detailed-counts=yes</code> is specified, a table is printed with counts of loads, stores and ALU operations for various types of operands.</p><p>The types are identified by their IR name ("I1" ... "I128", "F32", "F64", and "V128").</p></li><li><p>When command line option <code class="computeroutput">--trace-mem=yes</code> is specified, it prints out the size and address of almost every load and store made by the program. See the comments at the top of the file <code class="computeroutput">lackey/lk_main.c</code> for details about the output format, how it works, and inaccuracies in the address trace. </p></li></ol></div><p>Note that Lackey runs quite slowly, especially when<code class="computeroutput">--detailed-counts=yes</code> is specified.It could be made to run a lot faster by doing a slightly moresophisticated job of the instrumentation, but that would undermineits role as a simple example tool. Hence we have chosen not to doso.</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="lk-manual.options"></a>9.2.燣ackey Options</h2></div></div></div><p>Lackey-specific options are:</p><div class="variablelist"><a name="lk.opts.list"></a><dl><dt><a name="opt.fnname"></a><span class="term"> <code class="option">--fnname=<name> [default: _dl_runtime_resolve()] </code> </span></dt><dd><p>Count calls to <name>.</p></dd><dt><a name="opt.detailed-counts"></a><span class="term"> <code class="option">--detailed-counts=<no|yes> [default: no] </code> </span></dt><dd><p>Count loads, stores and alu ops.</p></dd></dl></div></div></div><div><br><table class="nav" width="100%" cellspacing="3" cellpadding="2" border="0" summary="Navigation footer"><tr><td rowspan="2" width="40%" align="left"><a accesskey="p" href="nl-manual.html"><<⌨️ 快捷键说明
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