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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 |
| two marked points to be calculated.</p> |
| |
| <p class="important"><strong>Note:</strong> This class is initialized automatically by the system so there is no need to do it manually.</p> |
| |
| |
| <p>In addition, the benchmark is always started the moment the framework is |
| invoked, and ended by the output class right before sending the final view to the browser, enabling a very accurate |
| timing of the entire system execution to be shown.</p> |
| |
| |
| <h3>Table of Contents</h3> |
| |
| <ul> |
| <li><a href="#using">Using the Benchmark Class</a></li> |
| <li><a href="#profiler">Profiling Your Benchmark Points</a></li> |
| <li><a href="#execution">Displaying Total Execution Time</a></li> |
| <li><a href="#memory">Displaying Memory Consumption</a></li> |
| </ul> |
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| <a name="using"></a> |
| <h2>Using the Benchmark Class</h2> |
| |
| <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> |
| |
| <ol> |
| <li>Mark a start point</li> |
| <li>Mark an end point</li> |
| <li>Run the "elapsed time" function to view the results</li> |
| </ol> |
| |
| <p>Here's an example using real code:</p> |
| |
| <code>$this->benchmark->mark('code_start');<br /> |
| <br /> |
| // Some code happens here<br /> |
| <br /> |
| $this->benchmark->mark('code_end');<br /> |
| <br /> |
| echo $this->benchmark->elapsed_time('code_start', 'code_end');</code> |
| |
| <p class="important"><strong>Note:</strong> The words "code_start" and "code_end" are arbitrary. They are simply words used to set two markers. You can |
| use any words you want, and you can set multiple sets of markers. Consider this example:</p> |
| |
| <code>$this->benchmark->mark('dog');<br /> |
| <br /> |
| // Some code happens here<br /> |
| <br /> |
| $this->benchmark->mark('cat');<br /> |
| <br /> |
| // More code happens here<br /> |
| <br /> |
| $this->benchmark->mark('bird');<br /> |
| <br /> |
| echo $this->benchmark->elapsed_time('dog', 'cat');<br /> |
| echo $this->benchmark->elapsed_time('cat', 'bird');<br /> |
| echo $this->benchmark->elapsed_time('dog', 'bird');</code> |
| |
| |
| <a name="profiler"></a> |
| <h2>Profiling Your Benchmark Points</h2> |
| |
| <p>If you want your benchmark data to be available to the |
| <a href="../general/profiling.html">Profiler</a> all of your marked points must be set up in pairs, and |
| each mark point name must end with <kbd>_start</kbd> and <kbd>_end</kbd>. |
| Each pair of points must otherwise be named identically. Example:</p> |
| |
| <code> |
| $this->benchmark->mark('my_mark<kbd>_start</kbd>');<br /> |
| <br /> |
| // Some code happens here...<br /> |
| <br /> |
| $this->benchmark->mark('my_mark<kbd>_end</kbd>'); |
| <br /><br /> |
| |
| $this->benchmark->mark('another_mark<kbd>_start</kbd>');<br /> |
| <br /> |
| // Some more code happens here...<br /> |
| <br /> |
| $this->benchmark->mark('another_mark<kbd>_end</kbd>'); |
| </code> |
| |
| <p>Please read the <a href="../general/profiling.html">Profiler page</a> for more information.</p> |
| |
| |
| <a name="execution"></a> |
| <h2>Displaying Total Execution Time</h2> |
| |
| <p>If you would like to display the total elapsed time from the moment CodeIgniter starts to the moment the final output |
| is sent to the browser, simply place this in one of your view templates:</p> |
| |
| <code><?php echo $this->benchmark->elapsed_time();?></code> |
| |
| <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 |
| <strong>not</strong> using any parameters. When the parameters are absent, CodeIgniter does not stop the benchmark until right before the final |
| 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> |
| |
| <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> |
| <code>{elapsed_time}</code> |
| |
| <p class="important"><strong>Note:</strong> If you want to benchmark anything within your controller |
| functions you must set your own start/end points.</p> |
| |
| <a name="memory"></a> |
| <h2>Displaying Memory Consumption</h2> |
| |
| <p>If your PHP installation is configured with --enable-memory-limit, you can display the amount of memory consumed by the entire |
| system using the following code in one of your view file:</p> |
| |
| <code><?php echo $this->benchmark->memory_usage();?></code> |
| <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> |
| |
| <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> |
| <code>{memory_usage}</code> |
| |
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