1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
<!DOCTYPE html>
<html class="writer-html5" lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>12.7. Using Valgrind to Find Open MPI Application Errors — Open MPI 5.0.8 documentation</title>
<link rel="stylesheet" type="text/css" href="../_static/pygments.css" />
<link rel="stylesheet" type="text/css" href="../_static/css/theme.css" />
<!--[if lt IE 9]>
<script src="../_static/js/html5shiv.min.js"></script>
<![endif]-->
<script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script>
<script src="../_static/jquery.js"></script>
<script src="../_static/underscore.js"></script>
<script src="../_static/_sphinx_javascript_frameworks_compat.js"></script>
<script src="../_static/doctools.js"></script>
<script src="../_static/sphinx_highlight.js"></script>
<script src="../_static/js/theme.js"></script>
<link rel="index" title="Index" href="../genindex.html" />
<link rel="search" title="Search" href="../search.html" />
<link rel="next" title="12.8. Using MPIR-based tools with Open MPI" href="mpir-tools.html" />
<link rel="prev" title="12.6. Using Memchecker" href="memchecker.html" />
</head>
<body class="wy-body-for-nav">
<div class="wy-grid-for-nav">
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div class="wy-side-scroll">
<div class="wy-side-nav-search" >
<a href="../index.html" class="icon icon-home">
Open MPI
</a>
<div role="search">
<form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
<input type="text" name="q" placeholder="Search docs" aria-label="Search docs" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu">
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../quickstart.html">1. Quick start</a></li>
<li class="toctree-l1"><a class="reference internal" href="../getting-help.html">2. Getting help</a></li>
<li class="toctree-l1"><a class="reference internal" href="../release-notes/index.html">3. Release notes</a></li>
<li class="toctree-l1"><a class="reference internal" href="../installing-open-mpi/index.html">4. Building and installing Open MPI</a></li>
<li class="toctree-l1"><a class="reference internal" href="../features/index.html">5. Open MPI-specific features</a></li>
<li class="toctree-l1"><a class="reference internal" href="../validate.html">6. Validating your installation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../version-numbering.html">7. Version numbers and compatibility</a></li>
<li class="toctree-l1"><a class="reference internal" href="../mca.html">8. The Modular Component Architecture (MCA)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../building-apps/index.html">9. Building MPI applications</a></li>
<li class="toctree-l1"><a class="reference internal" href="../launching-apps/index.html">10. Launching MPI applications</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tuning-apps/index.html">11. Run-time operation and tuning MPI applications</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="index.html">12. Debugging Open MPI Parallel Applications</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="debug-tools.html">12.1. Parallel Debugging Tools</a></li>
<li class="toctree-l2"><a class="reference internal" href="debug-options.html">12.2. Open MPI Runtime Debugging Options</a></li>
<li class="toctree-l2"><a class="reference internal" href="serial-debug.html">12.3. Using Serial Debuggers to Debug Open MPI Applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="parallel-debug.html">12.4. Using Parallel Debuggers to Debug Open MPI Applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="lost-output.html">12.5. Application Output Lost with Abnormal Termination</a></li>
<li class="toctree-l2"><a class="reference internal" href="memchecker.html">12.6. Using Memchecker</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">12.7. Using Valgrind to Find Open MPI Application Errors</a></li>
<li class="toctree-l2"><a class="reference internal" href="mpir-tools.html">12.8. Using MPIR-based tools with Open MPI</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../developers/index.html">13. Developer’s guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="../contributing.html">14. Contributing to Open MPI</a></li>
<li class="toctree-l1"><a class="reference internal" href="../license/index.html">15. License</a></li>
<li class="toctree-l1"><a class="reference internal" href="../history.html">16. History of Open MPI</a></li>
<li class="toctree-l1"><a class="reference internal" href="../man-openmpi/index.html">17. Open MPI manual pages</a></li>
<li class="toctree-l1"><a class="reference internal" href="../man-openshmem/index.html">18. OpenSHMEM manual pages</a></li>
</ul>
</div>
</div>
</nav>
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" >
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
<a href="../index.html">Open MPI</a>
</nav>
<div class="wy-nav-content">
<div class="rst-content">
<div role="navigation" aria-label="Page navigation">
<ul class="wy-breadcrumbs">
<li><a href="../index.html" class="icon icon-home" aria-label="Home"></a></li>
<li class="breadcrumb-item"><a href="index.html"><span class="section-number">12. </span>Debugging Open MPI Parallel Applications</a></li>
<li class="breadcrumb-item active"><span class="section-number">12.7. </span>Using Valgrind to Find Open MPI Application Errors</li>
<li class="wy-breadcrumbs-aside">
<a href="../_sources/app-debug/valgrind.rst.txt" rel="nofollow"> View page source</a>
</li>
</ul>
<hr/>
</div>
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
<div itemprop="articleBody">
<style>
.wy-table-responsive table td,.wy-table-responsive table th{white-space:normal}
</style><div class="section" id="using-valgrind-to-find-open-mpi-application-errors">
<h1><span class="section-number">12.7. </span>Using Valgrind to Find Open MPI Application Errors<a class="headerlink" href="#using-valgrind-to-find-open-mpi-application-errors" title="Permalink to this heading"></a></h1>
<p>The <a class="reference external" href="https://valgrind.org/">Valgrind</a> utilities may be useful in identifying application
logic errors. However, there are many situations where Open MPI purposefully does
not initialize and subsequently communicate memory, e.g., by calling <code class="docutils literal notranslate"><span class="pre">writev(2)</span></code>.
Furthermore, several cases are known where memory is not properly freed when
MPI is finalized.</p>
<p>This certainly does not help distinguishing real errors from false positives.
Valgrind provides functionality to suppress errors and warnings from certain
function contexts.</p>
<p>In an attempt to ease debugging using Valgrind, Open MPI provides a
Valgrind suppression file, that can be passed on the command
line:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>mpirun<span class="w"> </span>-n<span class="w"> </span><span class="m">2</span><span class="w"> </span>valgrind<span class="w"> </span>--suppressions<span class="o">=</span><span class="nv">$PREFIX</span>/share/openmpi/openmpi-valgrind.supp
</pre></div>
</div>
<p>More information on suppression files and how to generate them can be
found in <a class="reference external" href="https://valgrind.org/docs/manual/manual-core.html#manual-core.suppress">Valgrind’s documentation</a>.</p>
</div>
</div>
</div>
<footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer">
<a href="memchecker.html" class="btn btn-neutral float-left" title="12.6. Using Memchecker" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a>
<a href="mpir-tools.html" class="btn btn-neutral float-right" title="12.8. Using MPIR-based tools with Open MPI" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
</div>
<hr/>
<div role="contentinfo">
<p>© Copyright 2003-2025, The Open MPI Community.
<span class="lastupdated">Last updated on 2025-05-30 16:41:43 UTC.
</span></p>
</div>
Built with <a href="https://www.sphinx-doc.org/">Sphinx</a> using a
<a href="https://github.com/readthedocs/sphinx_rtd_theme">theme</a>
provided by <a href="https://readthedocs.org">Read the Docs</a>.
</footer>
</div>
</div>
</section>
</div>
<script>
jQuery(function () {
SphinxRtdTheme.Navigation.enable(true);
});
</script>
</body>
</html>
|
