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128 lines
4.9 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<head>
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<title>DbEnv::set_mp_mtxcount()</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="memp.html" title="Chapter 9. The DbMpoolFile Handle" />
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<div xmlns="" class="navheader">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DbEnv::set_mp_mtxcount()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="envset_mp_mmapsize.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 9.
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The DbMpoolFile Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="envset_mp_pagesize.html">Next</a></td>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="envset_mp_mtxcount"></a>DbEnv::set_mp_mtxcount()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbEnv::set_mp_mtxcount(u_int32_t mtxcount);</pre>
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<p>
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The <code class="methodname">DbEnv::set_mp_mtxcount()</code> method
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overrides the default number of mutexes for the hash table in each
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memory pool cache. The defualt is one mutex per hash bucket.
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Setting it to a lower number decreases the number of mutexes used
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and the amount of memory needed to store them at the expense of
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concurrency in the memory pool. This can also improve startup
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time. Setting a number greater than the number size of the hash
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table will waste mutexes and space.
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</p>
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<p>
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You must call this method only before the environment is opened.
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3647130"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3647165"></a>mtxcount</h4>
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</div>
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</div>
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</div>
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<p>
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Specifies the number of mutexes allocated to the buffer
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pool hash table.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3647390"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>,
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<a class="link" href="memp.html" title="Chapter 9. The DbMpoolFile Handle">DbMpoolFile</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3647408"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>,
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<a class="xref" href="envget_mp_mtxcount.html" title="DbEnv::get_mp_mtxcount()">DbEnv::get_mp_mtxcount()</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<td width="40%" align="left"><a accesskey="p" href="envset_mp_mmapsize.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="memp.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="envset_mp_pagesize.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DbEnv::set_mp_mmapsize() </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> DbEnv::set_mp_pagesize()</td>
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