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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-5.7.5.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 5.7.5</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#id2258668">Purpose</a></li>
<li title="Prerequisites"><a href="introduction.html#id2259835">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#id2252829">Myth: Funs are slow</a></li>
<li title="Myth: List comprehensions are slow"><a href="myths.html#id2255920">Myth: List comprehensions are slow</a></li>
<li title="Myth: Tail-recursive functions are MUCH faster
than recursive functions"><a href="myths.html#id2251841">Myth: Tail-recursive functions are MUCH faster
than recursive functions</a></li>
<li title="Myth: '++' is always bad"><a href="myths.html#id2253656">Myth: '++' is always bad</a></li>
<li title="Myth: Strings are slow"><a href="myths.html#id2259534">Myth: Strings are slow</a></li>
<li title="Myth: Repairing a Dets file is very slow"><a href="myths.html#id2252646">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#id2252903">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#id2254092">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 regexp module"><a href="commoncaveats.html#id2254130">The regexp module</a></li>
<li title="The timer module"><a href="commoncaveats.html#id2252598">The timer module</a></li>
<li title="list_to_atom/1"><a href="commoncaveats.html#id2255906">list_to_atom/1</a></li>
<li title="length/1"><a href="commoncaveats.html#id2252967">length/1</a></li>
<li title="setelement/3"><a href="commoncaveats.html#id2262040">setelement/3</a></li>
<li title="size/1"><a href="commoncaveats.html#id2253013">size/1</a></li>
<li title="split_binary/2"><a href="commoncaveats.html#id2259425">split_binary/2</a></li>
<li title="The '--' operator"><a href="commoncaveats.html#id2259471">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#id2257812">How binaries are implemented</a></li>
<li title="Constructing binaries"><a href="binaryhandling.html#id2251922">Constructing binaries</a></li>
<li title="Matching binaries"><a href="binaryhandling.html#id2264031">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#id2260919">Creating a list</a></li>
<li title="List comprehensions"><a href="listHandling.html#id2261027">List comprehensions</a></li>
<li title="Deep and flat lists"><a href="listHandling.html#id2261105">Deep and flat lists</a></li>
<li title="Why you should not worry about recursive lists functions"><a href="listHandling.html#id2261258">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#id2261398">Pattern matching</a></li>
<li title="Function Calls "><a href="functions.html#id2261646">Function Calls </a></li>
<li title="Memory usage in recursion"><a href="functions.html#id2261797">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#id2261897">Ets, Dets and Mnesia</a></li>
<li title="Ets specific"><a href="tablesDatabases.html#id2264895">Ets specific</a></li>
<li title="Mnesia specific"><a href="tablesDatabases.html#id2265012">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#id2265135">Creation of an Erlang process</a></li>
<li title="Process messages"><a href="processes.html#id2265309">Process messages</a></li>
<li title="The SMP emulator"><a href="processes.html#id2265527">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#id2265646">Drivers and concurrency</a></li>
<li title="Avoiding copying of binaries when calling a driver"><a href="drivers.html#id2265697">Avoiding copying of binaries when calling a driver</a></li>
<li title="Returning small binaries from a driver"><a href="drivers.html#id2265773">Returning small binaries from a driver</a></li>
<li title="Returning big binaries without copying from a driver"><a href="drivers.html#id2265814">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#id2265969">Memory</a></li>
<li title="System limits"><a href="advanced.html#id2266338">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#id2266674">Do not guess about performance - profile</a></li>
<li title="Big systems"><a href="profiling.html#id2266757">Big systems</a></li>
<li title="What to look for"><a href="profiling.html#id2266782">What to look for</a></li>
<li title="Tools"><a href="profiling.html#id2266849">Tools</a></li>
<li title="Benchmarking"><a href="profiling.html#id2267343">Benchmarking</a></li>
</ul>
</li>
</ul>
</div></div>
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<div class="frontpage"></div>
<center><h1>Efficiency Guide User's Guide</h1></center>
<center><h4>Version 5.7.5</h4></center>
<center><h4>February 22 2010</h4></center>
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