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<img alt="Erlang logo" src="../erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="../pdf/otp-system-documentation-5.9.3.1.pdf">PDF</a><br><a href="../index.html">Top</a></small><p><strong>Efficiency Guide</strong><br><strong>User's Guide</strong><br><small>Version 5.9.3.1</small></p>
<br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Chapters</strong></small></p>
<ul class="flipMenu" imagepath="../js/flipmenu">
<li id="no" title="Introduction" expanded="false">Introduction<ul>
<li><a href="introduction.html">
Top of chapter
</a></li>
<li title="Purpose"><a href="introduction.html#id62954">Purpose</a></li>
<li title="Prerequisites"><a href="introduction.html#id65420">Prerequisites</a></li>
</ul>
</li>
<li id="no" title="The Eight Myths of Erlang Performance" expanded="false">The Eight Myths of Erlang Performance<ul>
<li><a href="myths.html">
Top of chapter
</a></li>
<li title="Myth: Funs are slow"><a href="myths.html#id64448">Myth: Funs are slow</a></li>
<li title="Myth: List comprehensions are slow"><a href="myths.html#id61406">Myth: List comprehensions are slow</a></li>
<li title="Myth: Tail-recursive functions are MUCH faster
than recursive functions"><a href="myths.html#id62291">Myth: Tail-recursive functions are MUCH faster
than recursive functions</a></li>
<li title="Myth: '++' is always bad"><a href="myths.html#id60058">Myth: '++' is always bad</a></li>
<li title="Myth: Strings are slow"><a href="myths.html#id62534">Myth: Strings are slow</a></li>
<li title="Myth: Repairing a Dets file is very slow"><a href="myths.html#id61135">Myth: Repairing a Dets file is very slow</a></li>
<li title="Myth: BEAM is a stack-based byte-code virtual machine (and therefore slow)"><a href="myths.html#id64006">Myth: BEAM is a stack-based byte-code virtual machine (and therefore slow)</a></li>
<li title="Myth: Use '_' to speed up your program when a variable is not used"><a href="myths.html#id64026">Myth: Use '_' to speed up your program when a variable is not used</a></li>
</ul>
</li>
<li id="no" title="Common Caveats" expanded="false">Common Caveats<ul>
<li><a href="commoncaveats.html">
Top of chapter
</a></li>
<li title="The timer module"><a href="commoncaveats.html#id62547">The timer module</a></li>
<li title="list_to_atom/1"><a href="commoncaveats.html#id61885">list_to_atom/1</a></li>
<li title="length/1"><a href="commoncaveats.html#id60806">length/1</a></li>
<li title="setelement/3"><a href="commoncaveats.html#id58300">setelement/3</a></li>
<li title="size/1"><a href="commoncaveats.html#id65402">size/1</a></li>
<li title="split_binary/2"><a href="commoncaveats.html#id60836">split_binary/2</a></li>
<li title="The '--' operator"><a href="commoncaveats.html#id61766">The '--' operator</a></li>
</ul>
</li>
<li id="no" title="Constructing and matching binaries" expanded="false">Constructing and matching binaries<ul>
<li><a href="binaryhandling.html">
Top of chapter
</a></li>
<li title="How binaries are implemented"><a href="binaryhandling.html#id62932">How binaries are implemented</a></li>
<li title="Constructing binaries"><a href="binaryhandling.html#id66066">Constructing binaries</a></li>
<li title="Matching binaries"><a href="binaryhandling.html#id63610">Matching binaries</a></li>
</ul>
</li>
<li id="no" title="List handling" expanded="false">List handling<ul>
<li><a href="listHandling.html">
Top of chapter
</a></li>
<li title="Creating a list"><a href="listHandling.html#id66709">Creating a list</a></li>
<li title="List comprehensions"><a href="listHandling.html#id66805">List comprehensions</a></li>
<li title="Deep and flat lists"><a href="listHandling.html#id66875">Deep and flat lists</a></li>
<li title="Why you should not worry about recursive lists functions"><a href="listHandling.html#id67017">Why you should not worry about recursive lists functions</a></li>
</ul>
</li>
<li id="no" title="Functions" expanded="false">Functions<ul>
<li><a href="functions.html">
Top of chapter
</a></li>
<li title="Pattern matching"><a href="functions.html#id67142">Pattern matching</a></li>
<li title="Function Calls "><a href="functions.html#id67362">Function Calls </a></li>
<li title="Memory usage in recursion"><a href="functions.html#id67506">Memory usage in recursion</a></li>
</ul>
</li>
<li id="no" title="Tables and databases" expanded="false">Tables and databases<ul>
<li><a href="tablesDatabases.html">
Top of chapter
</a></li>
<li title="Ets, Dets and Mnesia"><a href="tablesDatabases.html#id67596">Ets, Dets and Mnesia</a></li>
<li title="Ets specific"><a href="tablesDatabases.html#id67983">Ets specific</a></li>
<li title="Mnesia specific"><a href="tablesDatabases.html#id68087">Mnesia specific</a></li>
</ul>
</li>
<li id="no" title="Processes" expanded="false">Processes<ul>
<li><a href="processes.html">
Top of chapter
</a></li>
<li title="Creation of an Erlang process"><a href="processes.html#id68191">Creation of an Erlang process</a></li>
<li title="Process messages"><a href="processes.html#id68339">Process messages</a></li>
<li title="The SMP emulator"><a href="processes.html#id68531">The SMP emulator</a></li>
</ul>
</li>
<li id="no" title="Drivers" expanded="false">Drivers<ul>
<li><a href="drivers.html">
Top of chapter
</a></li>
<li title="Drivers and concurrency"><a href="drivers.html#id68634">Drivers and concurrency</a></li>
<li title="Avoiding copying of binaries when calling a driver"><a href="drivers.html#id68675">Avoiding copying of binaries when calling a driver</a></li>
<li title="Returning small binaries from a driver"><a href="drivers.html#id68743">Returning small binaries from a driver</a></li>
<li title="Returning big binaries without copying from a driver"><a href="drivers.html#id68777">Returning big binaries without copying from a driver</a></li>
</ul>
</li>
<li id="no" title="Advanced" expanded="false">Advanced<ul>
<li><a href="advanced.html">
Top of chapter
</a></li>
<li title="Memory"><a href="advanced.html#id68919">Memory</a></li>
<li title="System limits"><a href="advanced.html#id69276">System limits</a></li>
</ul>
</li>
<li id="no" title="Profiling" expanded="false">Profiling<ul>
<li><a href="profiling.html">
Top of chapter
</a></li>
<li title="Do not guess about performance - profile"><a href="profiling.html#id69579">Do not guess about performance - profile</a></li>
<li title="Big systems"><a href="profiling.html#id69661">Big systems</a></li>
<li title="What to look for"><a href="profiling.html#id69681">What to look for</a></li>
<li title="Tools"><a href="profiling.html#id69738">Tools</a></li>
<li title="Benchmarking"><a href="profiling.html#id70245">Benchmarking</a></li>
</ul>
</li>
</ul>
</div></div>
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<center><h1>Efficiency Guide User's Guide</h1></center>
<center><h4>Version 5.9.3.1</h4></center>
<center><h4>December 6 2012</h4></center>
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