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<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td>
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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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<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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<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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<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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<p>Here's an example using real code:</p>
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<code>$this->benchmark->mark('code_start');<br />
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// Some code happens here<br />
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$this->benchmark->mark('code_end');<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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// Some code happens here<br />
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$this->benchmark->mark('cat');<br />
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// More code happens here<br />
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$this->benchmark->mark('bird');<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 $this->benchmark->elapsed_time('dog', 'bird');</code>
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<a name="profiler"></a>
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<h2>Profiling Your Benchmark Points</h2>
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<p>If you want your benchmark data to be available to the
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<a href="../general/profiling.html">Profiler</a> all of your marked points must be set up in pairs, and
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each mark point name must end with <kbd>_start</kbd> and <kbd>_end</kbd>.
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Each pair of points must otherwise be named identically. Example:</p>
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$this->benchmark->mark('my_mark<kbd>_start</kbd>');<br />
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// Some code happens here...<br />
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$this->benchmark->mark('my_mark<kbd>_end</kbd>');
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$this->benchmark->mark('another_mark<kbd>_start</kbd>');<br />
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// Some more code happens here...<br />
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$this->benchmark->mark('another_mark<kbd>_end</kbd>');
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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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