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<![endif]--><script type="text/javascript" src="common/browserDetect.js"></script><script type="text/javascript" src="common/jquery/jquery-1.7.2.min.js"></script><script type="text/javascript" src="common/jquery/jquery.ui.all.js"></script><script type="text/javascript" src="common/jquery/jquery.cookie.js"></script><script type="text/javascript" src="common/jquery/treeview/jquery.treeview.min.js"></script><script type="text/javascript" src="common/jquery/layout/jquery.layout.js"></script><script type="text/javascript" src="search/l10n.js"></script><script type="text/javascript" src="search/htmlFileInfoList.js"></script><script type="text/javascript" src="search/nwSearchFnt.js"></script><script type="text/javascript" src="search/stemmers/en_stemmer.js"><!--//make this scalable to other languages as well.--></script><script type="text/javascript" src="search/index-1.js"></script><script type="text/javascript" src="search/index-2.js"></script><script type="text/javascript" src="search/index-3.js"></script></head><body><noscript><div id="noscript">JavaScript is disabled on your browser. Please enable JavaScript to enjoy all the features of this site.</div></noscript><div id="header"><a href="index.html"><img style="margin-right: 2px; height: 59px; padding-right: 25px; padding-top: 8px" align="right" src="common/images/logo.png" alt=" Documentation"></img></a><h1>Recoll user manual<br></br>The main configuration file, recoll.conf</h1><div id="navheader"><table class="navLinks"><tr><td><a id="showHideButton" href="#" onclick="myLayout.toggle('west')" class="pointLeft" tabindex="5" title="Hide TOC tree">Sidebar
</a></td><td><a accesskey="p" class="navLinkPrevious" tabindex="5" href="RCL.INSTALL.CONFIG.RECOLLCONF.STORAGE.html">Prev</a>
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<a accesskey="n" class="navLinkNext" tabindex="5" href="RCL.INSTALL.CONFIG.RECOLLCONF.MISC.html">Next</a></td></tr></table></div></div><div id="content"><div class="sect3"><div class="titlepage"><div><div><h4 class="title"><a id="RCL.INSTALL.CONFIG.RECOLLCONF.IDXTHREADS"></a>Parameters affecting multithread processing</h4></div></div></div><p>The <span class="application">Recoll</span> indexing process
<span class="command"><strong>recollindex</strong></span> can use multiple threads to
speed up indexing on multiprocessor systems. The work done
to index files is divided in several stages and some of the
stages can be executed by multiple threads. The stages are:
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">File system walking: this is always performed by
the main thread.</li><li class="listitem">File conversion and data extraction.</li><li class="listitem">Text processing (splitting, stemming,
etc.)</li><li class="listitem"><span class="application">Xapian</span> index update.</li></ol></div><p>
</p><p>You can also read a
<a class="ulink" href="http://www.recoll.org/idxthreads/threadingRecoll.html" target="_top">
longer document</a> about the transformation of
<span class="application">Recoll</span> indexing to multithreading.</p><p>The threads configuration is controlled by two
configuration file parameters.</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="varname">thrQSizes</code></span></dt><dd><p>This variable defines the job input queues
configuration. There are three possible queues for
stages 2, 3 and 4, and this parameter should give the
queue depth for each stage (three integer values). If
a value of -1 is used for a given stage, no queue is
used, and the thread will go on performing the next
stage. In practise, deep queues have not been shown to
increase performance. A value of 0 for the first queue
tells <span class="application">Recoll</span> to perform autoconfiguration (no need for
the two other values in this case) - this is the
default configuration.</p></dd><dt><span class="term"><code class="varname">thrTCounts</code></span></dt><dd><p>This defines the number of threads used
for each stage. If a value of -1 is used for one of
the queue depths, the corresponding thread count is
ignored. It makes no sense to use a value other than 1
for the last stage because updating the <span class="application">Xapian</span> index is
necessarily single-threaded (and protected by a
mutex).</p></dd></dl></div><p>The following example would use three queues (of depth 2),
and 4 threads for converting source documents, 2 for
processing their text, and one to update the index. This was
tested to be the best configuration on the test system
(quadri-processor with multiple disks).
</p><pre class="programlisting">
thrQSizes = 2 2 2
thrTCounts = 4 2 1
</pre><p>
</p><p>The following example would use a single queue, and the
complete processing for each document would be performed by
a single thread (several documents will still be processed
in parallel in most cases). The threads will use mutual
exclusion when entering the index update stage. In practise
the performance would be close to the precedent case in
general, but worse in certain cases (e.g. a Zip archive
would be performed purely sequentially), so the previous
approach is preferred. YMMV... The 2 last values for
thrTCounts are ignored.
</p><pre class="programlisting">
thrQSizes = 2 -1 -1
thrTCounts = 6 1 1
</pre><p>
</p><p>The following example would disable
multithreading. Indexing will be performed by a single
thread.
</p><pre class="programlisting">
thrQSizes = -1 -1 -1
</pre><p>
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