198 lines
7.6 KiB
HTML
198 lines
7.6 KiB
HTML
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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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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Benchmarking Class : CodeIgniter User Guide</title>
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<style type='text/css' media='all'>@import url('../userguide.css');</style>
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<meta name='author' content='ExpressionEngine Dev Team' />
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<meta name='description' content='CodeIgniter User Guide' />
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<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
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<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td><h1>CodeIgniter User Guide Version 2.1.4</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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<tr>
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<td id="breadcrumb">
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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Benchmarking Class
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</td>
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<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="ellislab.com/codeigniter/user-guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
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</table>
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<br clear="all" />
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<!-- START CONTENT -->
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<div id="content">
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<h1>Benchmarking Class</h1>
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<p>CodeIgniter has a Benchmarking class that is always active, enabling the time difference between any
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two marked points to be calculated.</p>
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<p class="important"><strong>Note:</strong> This class is initialized automatically by the system so there is no need to do it manually.</p>
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<p>In addition, the benchmark is always started the moment the framework is
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invoked, and ended by the output class right before sending the final view to the browser, enabling a very accurate
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timing of the entire system execution to be shown.</p>
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<h3>Table of Contents</h3>
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<ul>
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<li><a href="#using">Using the Benchmark Class</a></li>
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<li><a href="#profiler">Profiling Your Benchmark Points</a></li>
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<li><a href="#execution">Displaying Total Execution Time</a></li>
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<li><a href="#memory">Displaying Memory Consumption</a></li>
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</ul>
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<a name="using"></a>
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<h2>Using the Benchmark Class</h2>
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<p>The Benchmark class can be used within your <a href="../general/controllers.html">controllers</a>, <a href="../general/views.html">views</a>, or your <a href="../general/models.html">models</a>. The process for usage is this:</p>
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<ol>
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<li>Mark a start point</li>
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<li>Mark an end point</li>
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<li>Run the "elapsed time" function to view the results</li>
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</ol>
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<p>Here's an example using real code:</p>
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<code>$this->benchmark->mark('code_start');<br />
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<br />
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// Some code happens here<br />
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<br />
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$this->benchmark->mark('code_end');<br />
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<br />
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echo $this->benchmark->elapsed_time('code_start', 'code_end');</code>
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<p class="important"><strong>Note:</strong> The words "code_start" and "code_end" are arbitrary. They are simply words used to set two markers. You can
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use any words you want, and you can set multiple sets of markers. Consider this example:</p>
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<code>$this->benchmark->mark('dog');<br />
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<br />
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// Some code happens here<br />
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<br />
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$this->benchmark->mark('cat');<br />
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<br />
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// More code happens here<br />
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<br />
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$this->benchmark->mark('bird');<br />
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<br />
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echo $this->benchmark->elapsed_time('dog', 'cat');<br />
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echo $this->benchmark->elapsed_time('cat', 'bird');<br />
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echo $this->benchmark->elapsed_time('dog', 'bird');</code>
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<a name="profiler"></a>
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<h2>Profiling Your Benchmark Points</h2>
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<p>If you want your benchmark data to be available to the
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<a href="../general/profiling.html">Profiler</a> all of your marked points must be set up in pairs, and
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each mark point name must end with <kbd>_start</kbd> and <kbd>_end</kbd>.
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Each pair of points must otherwise be named identically. Example:</p>
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<code>
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$this->benchmark->mark('my_mark<kbd>_start</kbd>');<br />
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<br />
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// Some code happens here...<br />
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<br />
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$this->benchmark->mark('my_mark<kbd>_end</kbd>');
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<br /><br />
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$this->benchmark->mark('another_mark<kbd>_start</kbd>');<br />
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<br />
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// Some more code happens here...<br />
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<br />
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$this->benchmark->mark('another_mark<kbd>_end</kbd>');
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</code>
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<p>Please read the <a href="../general/profiling.html">Profiler page</a> for more information.</p>
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<a name="execution"></a>
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<h2>Displaying Total Execution Time</h2>
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<p>If you would like to display the total elapsed time from the moment CodeIgniter starts to the moment the final output
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is sent to the browser, simply place this in one of your view templates:</p>
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<code><?php echo $this->benchmark->elapsed_time();?></code>
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<p>You'll notice that it's the same function used in the examples above to calculate the time between two point, except you are
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<strong>not</strong> using any parameters. When the parameters are absent, CodeIgniter does not stop the benchmark until right before the final
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output is sent to the browser. It doesn't matter where you use the function call, the timer will continue to run until the very end.</p>
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<p>An alternate way to show your elapsed time in your view files is to use this pseudo-variable, if you prefer not to use the pure PHP:</p>
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<code>{elapsed_time}</code>
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<p class="important"><strong>Note:</strong> If you want to benchmark anything within your controller
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functions you must set your own start/end points.</p>
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<a name="memory"></a>
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<h2>Displaying Memory Consumption</h2>
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<p>If your PHP installation is configured with --enable-memory-limit, you can display the amount of memory consumed by the entire
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system using the following code in one of your view file:</p>
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<code><?php echo $this->benchmark->memory_usage();?></code>
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<p>Note: This function can only be used in your view files. The consumption will reflect the total memory used by the entire app.</p>
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<p>An alternate way to show your memory usage in your view files is to use this pseudo-variable, if you prefer not to use the pure PHP:</p>
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<code>{memory_usage}</code>
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</div>
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<!-- END CONTENT -->
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<div id="footer">
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<p>
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Previous Topic: <a href="../doc_style/index.html">Writing Documentaion</a>
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·
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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Next Topic: <a href="calendar.html">Calendar Class</a>
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2012 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
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</body>
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</html>
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