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<chapter id="nl-manual" xreflabel="Nulgrind">

<title>Nulgrind: the minimal Valgrind tool</title>

<para>To use this tool, you must specify
<option>--tool=none</option> on the Valgrind
command line.</para>

<sect1 id="nl-manual.overview" xreflabel="Overview">
<title>Overview</title>

<para>Nulgrind is the simplest possible Valgrind tool.  It performs no
instrumentation or analysis of a program, just runs it normally.  It is
mainly of use for Valgrind's developers for debugging and regression
testing.</para>

<para>Nonetheless you can run programs with Nulgrind.  They will run
roughly 5 times more slowly than normal, for no useful effect.  Note
that you need to use the option <option>--tool=none</option> to run
Nulgrind (ie. not <option>--tool=nulgrind</option>).</para>

</sect1>

</chapter>

