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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>1.Introduction</title> <link rel="stylesheet" type="text/css" href="vg_basic.css"> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="Valgrind Documentation"> <link rel="up" href="manual.html" title="Valgrind User Manual"> <link rel="prev" href="manual.html" title="Valgrind User Manual"> <link rel="next" href="manual-core.html" title="2.Using and understanding the Valgrind core"> </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="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="manual-core.html"><img src="images/next.png" width="18" height="21" border="0" alt="Next"></a></td> </tr></table></div> <div class="chapter"> <div class="titlepage"><div><div><h1 class="title"> <a name="manual-intro"></a>1.Introduction</h1></div></div></div> <div class="toc"> <p><b>Table of Contents</b></p> <dl class="toc"> <dt><span class="sect1"><a href="manual-intro.html#manual-intro.overview">1.1. An Overview of Valgrind</a></span></dt> <dt><span class="sect1"><a href="manual-intro.html#manual-intro.navigation">1.2. How to navigate this manual</a></span></dt> </dl> </div> <div class="sect1"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="manual-intro.overview"></a>1.1.An Overview of Valgrind</h2></div></div></div> <p>Valgrind is an instrumentation framework for building dynamic analysis tools. It comes with a set of tools each of which performs some kind of debugging, profiling, or similar task that helps you improve your programs. Valgrind's architecture is modular, so new tools can be created easily and without disturbing the existing structure.</p> <p>A number of useful tools are supplied as standard.</p> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"><p><span class="command"><strong>Memcheck</strong></span> is a memory error detector. It helps you make your programs, particularly those written in C and C++, more correct.</p></li> <li class="listitem"><p><span class="command"><strong>Cachegrind</strong></span> is a cache and branch-prediction profiler. It helps you make your programs run faster.</p></li> <li class="listitem"><p><span class="command"><strong>Callgrind</strong></span> is a call-graph generating cache profiler. It has some overlap with Cachegrind, but also gathers some information that Cachegrind does not.</p></li> <li class="listitem"><p><span class="command"><strong>Helgrind</strong></span> is a thread error detector. It helps you make your multi-threaded programs more correct. </p></li> <li class="listitem"><p><span class="command"><strong>DRD</strong></span> is also a thread error detector. It is similar to Helgrind but uses different analysis techniques and so may find different problems.</p></li> <li class="listitem"><p><span class="command"><strong>Massif</strong></span> is a heap profiler. It helps you make your programs use less memory.</p></li> <li class="listitem"><p><span class="command"><strong>DHAT</strong></span> is a different kind of heap profiler. It helps you understand issues of block lifetimes, block utilisation, and layout inefficiencies.</p></li> <li class="listitem"><p><span class="command"><strong>SGcheck</strong></span> is an experimental tool that can detect overruns of stack and global arrays. Its functionality is complementary to that of Memcheck: SGcheck finds problems that Memcheck can't, and vice versa..</p></li> <li class="listitem"><p><span class="command"><strong>BBV</strong></span> is an experimental SimPoint basic block vector generator. It is useful to people doing computer architecture research and development.</p></li> </ol></div> <p>There are also a couple of minor tools that aren't useful to most users: <span class="command"><strong>Lackey</strong></span> is an example tool that illustrates some instrumentation basics; and <span class="command"><strong>Nulgrind</strong></span> is the minimal Valgrind tool that does no analysis or instrumentation, and is only useful for testing purposes.</p> <p>Valgrind is closely tied to details of the CPU and operating system, and to a lesser extent, the compiler and basic C libraries. Nonetheless, it supports a number of widely-used platforms, listed in full at <a class="ulink" href="http://www.valgrind.org/" target="_top">http://www.valgrind.org/</a>.</p> <p>Valgrind is built via the standard Unix <code class="computeroutput">./configure</code>, <code class="computeroutput">make</code>, <code class="computeroutput">make install</code> process; full details are given in the README file in the distribution.</p> <p>Valgrind is licensed under the <a class="xref" href="license.gpl.html" title="1.The GNU General Public License"> The GNU General Public License</a>, version 2. The <code class="computeroutput">valgrind/*.h</code> headers that you may wish to include in your code (eg. <code class="filename">valgrind.h</code>, <code class="filename">memcheck.h</code>, <code class="filename">helgrind.h</code>, etc.) are distributed under a BSD-style license, so you may include them in your code without worrying about license conflicts. Some of the PThreads test cases, <code class="filename">pth_*.c</code>, are taken from "Pthreads Programming" by Bradford Nichols, Dick Buttlar & Jacqueline Proulx Farrell, ISBN 1-56592-115-1, published by O'Reilly & Associates, Inc.</p> <p>If you contribute code to Valgrind, please ensure your contributions are licensed as "GPLv2, or (at your option) any later version." This is so as to allow the possibility of easily upgrading the license to GPLv3 in future. If you want to modify code in the VEX subdirectory, please also see the file VEX/HACKING.README in the distribution.</p> </div> <div class="sect1"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="manual-intro.navigation"></a>1.2.How to navigate this manual</h2></div></div></div> <p>This manual's structure reflects the structure of Valgrind itself. First, we describe the Valgrind core, how to use it, and the options it supports. Then, each tool has its own chapter in this manual. You only need to read the documentation for the core and for the tool(s) you actually use, although you may find it helpful to be at least a little bit familiar with what all tools do. If you're new to all this, you probably want to run the Memcheck tool and you might find the <a class="xref" href="quick-start.html" title="The Valgrind Quick Start Guide">The Valgrind Quick Start Guide</a> useful.</p> <p>Be aware that the core understands some command line options, and the tools have their own options which they know about. This means there is no central place describing all the options that are accepted -- you have to read the options documentation both for <a class="xref" href="manual-core.html" title="2.Using and understanding the Valgrind core">Valgrind's core</a> and for the tool you want to use.</p> </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="manual.html"><<Valgrind User Manual</a></td> <td width="20%" align="center"><a accesskey="u" href="manual.html">Up</a></td> <td rowspan="2" width="40%" align="right"><a accesskey="n" href="manual-core.html">2.Using and understanding the Valgrind core>></a> </td> </tr> <tr><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td></tr> </table> </div> </body> </html>
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