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266<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
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283<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
284<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
285<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
286<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
287<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
288<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
289<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
290<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
291<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
292<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
293<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
294<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
295<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
296<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
297<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
298<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
299<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
300<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
301<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
302<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
303<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
304<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
305</ul>
306</li>
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309<li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current">
310<li class="toctree-l2 current"><a class="current reference internal" href="#">Benchmarking Class</a></li>
311<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching Driver</a></li>
312<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
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317<li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li>
318<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
319<li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li>
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340</ul>
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344<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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348<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
349<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
350<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
351<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
352<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
353<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
354<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
355<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
356<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
357<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
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359</ul>
360</li>
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388
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413 <li>Benchmarking Class</li>
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424
425 <div class="section" id="benchmarking-class">
426<h1>Benchmarking Class<a class="headerlink" href="#benchmarking-class" title="Permalink to this headline"></a></h1>
427<p>CodeIgniter has a Benchmarking class that is always active, enabling the
428time difference between any two marked points to be calculated.</p>
429<div class="admonition note">
430<p class="first admonition-title">Note</p>
431<p class="last">This class is initialized automatically by the system so there
432is no need to do it manually.</p>
433</div>
434<p>In addition, the benchmark is always started the moment the framework is
435invoked, and ended by the output class right before sending the final
436view to the browser, enabling a very accurate timing of the entire
437system execution to be shown.</p>
438<div class="contents local topic" id="contents">
439<ul class="simple">
440<li><a class="reference internal" href="#using-the-benchmark-class" id="id1">Using the Benchmark Class</a><ul>
441<li><a class="reference internal" href="#profiling-your-benchmark-points" id="id2">Profiling Your Benchmark Points</a></li>
442<li><a class="reference internal" href="#displaying-total-execution-time" id="id3">Displaying Total Execution Time</a></li>
443<li><a class="reference internal" href="#displaying-memory-consumption" id="id4">Displaying Memory Consumption</a></li>
444</ul>
445</li>
446<li><a class="reference internal" href="#class-reference" id="id5">Class Reference</a></li>
447</ul>
448</div>
449<div class="custom-index container"></div><div class="section" id="using-the-benchmark-class">
450<h2><a class="toc-backref" href="#id1">Using the Benchmark Class</a><a class="headerlink" href="#using-the-benchmark-class" title="Permalink to this headline"></a></h2>
451<p>The Benchmark class can be used within your
452<a class="reference internal" href="../general/controllers.html"><span class="doc">controllers</span></a>,
453<a class="reference internal" href="../general/views.html"><span class="doc">views</span></a>, or your <a class="reference internal" href="../general/models.html"><span class="doc">models</span></a>.
454The process for usage is this:</p>
455<ol class="arabic simple">
456<li>Mark a start point</li>
457<li>Mark an end point</li>
458<li>Run the “elapsed time” function to view the results</li>
459</ol>
460<p>Here’s an example using real code:</p>
461<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;code_start&#39;</span><span class="p">);</span>
462
463<span class="c1">// Some code happens here</span>
464
465<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;code_end&#39;</span><span class="p">);</span>
466
467<span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">&#39;code_start&#39;</span><span class="p">,</span> <span class="s1">&#39;code_end&#39;</span><span class="p">);</span>
468</pre></div>
469</div>
470<div class="admonition note">
471<p class="first admonition-title">Note</p>
472<p>The words “code_start” and “code_end” are arbitrary. They
473are simply words used to set two markers. You can use any words you
474want, and you can set multiple sets of markers. Consider this example:</p>
475<div class="last highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;dog&#39;</span><span class="p">);</span>
476
477<span class="c1">// Some code happens here</span>
478
479<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;cat&#39;</span><span class="p">);</span>
480
481<span class="c1">// More code happens here</span>
482
483<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;bird&#39;</span><span class="p">);</span>
484
485<span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">&#39;dog&#39;</span><span class="p">,</span> <span class="s1">&#39;cat&#39;</span><span class="p">);</span>
486<span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">&#39;cat&#39;</span><span class="p">,</span> <span class="s1">&#39;bird&#39;</span><span class="p">);</span>
487<span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">&#39;dog&#39;</span><span class="p">,</span> <span class="s1">&#39;bird&#39;</span><span class="p">);</span>
488</pre></div>
489</div>
490</div>
491<div class="section" id="profiling-your-benchmark-points">
492<h3><a class="toc-backref" href="#id2">Profiling Your Benchmark Points</a><a class="headerlink" href="#profiling-your-benchmark-points" title="Permalink to this headline"></a></h3>
493<p>If you want your benchmark data to be available to the
494<a class="reference internal" href="../general/profiling.html"><span class="doc">Profiler</span></a> all of your marked points must
495be set up in pairs, and each mark point name must end with _start and
496_end. Each pair of points must otherwise be named identically. Example:</p>
497<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;my_mark_start&#39;</span><span class="p">);</span>
498
499<span class="c1">// Some code happens here...</span>
500
501<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;my_mark_end&#39;</span><span class="p">);</span>
502
503<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;another_mark_start&#39;</span><span class="p">);</span>
504
505<span class="c1">// Some more code happens here...</span>
506
507<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;another_mark_end&#39;</span><span class="p">);</span>
508</pre></div>
509</div>
510<p>Please read the <a class="reference internal" href="../general/profiling.html"><span class="doc">Profiler page</span></a> for more
511information.</p>
512</div>
513<div class="section" id="displaying-total-execution-time">
514<h3><a class="toc-backref" href="#id3">Displaying Total Execution Time</a><a class="headerlink" href="#displaying-total-execution-time" title="Permalink to this headline"></a></h3>
515<p>If you would like to display the total elapsed time from the moment
516CodeIgniter starts to the moment the final output is sent to the
517browser, simply place this in one of your view templates:</p>
518<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">elapsed_time</span><span class="p">();</span><span class="cp">?&gt;</span>
519</pre></div>
520</div>
521<p>You’ll notice that it’s the same function used in the examples above to
522calculate the time between two point, except you are <strong>not</strong> using any
523parameters. When the parameters are absent, CodeIgniter does not stop
524the benchmark until right before the final output is sent to the
525browser. It doesn’t matter where you use the function call, the timer
526will continue to run until the very end.</p>
527<p>An alternate way to show your elapsed time in your view files is to use
528this pseudo-variable, if you prefer not to use the pure PHP:</p>
529<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="p">{</span><span class="nx">elapsed_time</span><span class="p">}</span>
530</pre></div>
531</div>
532<div class="admonition note">
533<p class="first admonition-title">Note</p>
534<p class="last">If you want to benchmark anything within your controller
535functions you must set your own start/end points.</p>
536</div>
537</div>
538<div class="section" id="displaying-memory-consumption">
539<h3><a class="toc-backref" href="#id4">Displaying Memory Consumption</a><a class="headerlink" href="#displaying-memory-consumption" title="Permalink to this headline"></a></h3>
540<p>If your PHP installation is configured with –enable-memory-limit, you
541can display the amount of memory consumed by the entire system using the
542following code in one of your view file:</p>
543<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">memory_usage</span><span class="p">();</span><span class="cp">?&gt;</span>
544</pre></div>
545</div>
546<div class="admonition note">
547<p class="first admonition-title">Note</p>
548<p class="last">This function can only be used in your view files. The consumption
549will reflect the total memory used by the entire app.</p>
550</div>
551<p>An alternate way to show your memory usage in your view files is to use
552this pseudo-variable, if you prefer not to use the pure PHP:</p>
553<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="p">{</span><span class="nx">memory_usage</span><span class="p">}</span>
554</pre></div>
555</div>
556</div>
557</div>
558<div class="section" id="class-reference">
559<h2><a class="toc-backref" href="#id5">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline"></a></h2>
560<dl class="class">
561<dt id="CI_Benchmark">
562<em class="property">class </em><code class="descname">CI_Benchmark</code><a class="headerlink" href="#CI_Benchmark" title="Permalink to this definition"></a></dt>
563<dd><dl class="method">
564<dt id="CI_Benchmark::mark">
565<code class="descname">mark</code><span class="sig-paren">(</span><em>$name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Benchmark::mark" title="Permalink to this definition"></a></dt>
566<dd><table class="docutils field-list" frame="void" rules="none">
567<col class="field-name" />
568<col class="field-body" />
569<tbody valign="top">
570<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
571<li><strong>$name</strong> (<em>string</em>) – the name you wish to assign to your marker</li>
572</ul>
573</td>
574</tr>
575<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
576</td>
577</tr>
578</tbody>
579</table>
580<p>Sets a benchmark marker.</p>
581</dd></dl>
582
583<dl class="method">
584<dt id="CI_Benchmark::elapsed_time">
585<code class="descname">elapsed_time</code><span class="sig-paren">(</span><span class="optional">[</span><em>$point1 = ''</em><span class="optional">[</span>, <em>$point2 = ''</em><span class="optional">[</span>, <em>$decimals = 4</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Benchmark::elapsed_time" title="Permalink to this definition"></a></dt>
586<dd><table class="docutils field-list" frame="void" rules="none">
587<col class="field-name" />
588<col class="field-body" />
589<tbody valign="top">
590<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
591<li><strong>$point1</strong> (<em>string</em>) – a particular marked point</li>
592<li><strong>$point2</strong> (<em>string</em>) – a particular marked point</li>
593<li><strong>$decimals</strong> (<em>int</em>) – number of decimal places for precision</li>
594</ul>
595</td>
596</tr>
597<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Elapsed time</p>
598</td>
599</tr>
600<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
601</td>
602</tr>
603</tbody>
604</table>
605<p>Calculates and returns the time difference between two marked points.</p>
606<p>If the first parameter is empty this function instead returns the
607<code class="docutils literal"><span class="pre">{elapsed_time}</span></code> pseudo-variable. This permits the full system
608execution time to be shown in a template. The output class will
609swap the real value for this variable.</p>
610</dd></dl>
611
612<dl class="method">
613<dt id="CI_Benchmark::memory_usage">
614<code class="descname">memory_usage</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Benchmark::memory_usage" title="Permalink to this definition"></a></dt>
615<dd><table class="docutils field-list" frame="void" rules="none">
616<col class="field-name" />
617<col class="field-body" />
618<tbody valign="top">
619<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Memory usage info</td>
620</tr>
621<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
622</tr>
623</tbody>
624</table>
625<p>Simply returns the <code class="docutils literal"><span class="pre">{memory_usage}</span></code> marker.</p>
626<p>This permits it to be put it anywhere in a template without the memory
627being calculated until the end. The <a class="reference internal" href="output.html"><span class="doc">Output Class</span></a> will
628swap the real value for this variable.</p>
629</dd></dl>
630
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