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- <div class="section" id="benchmarking-class">
-<h1>Benchmarking Class<a class="headerlink" href="#benchmarking-class" title="Permalink to this headline">¶</a></h1>
-<p>CodeIgniter has a Benchmarking class that is always active, enabling the
-time difference between any two marked points to be calculated.</p>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">This class is initialized automatically by the system so there
-is no need to do it manually.</p>
-</div>
-<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>
-<div class="contents local topic" id="contents">
-<ul class="simple">
-<li><a class="reference internal" href="#using-the-benchmark-class" id="id1">Using the Benchmark Class</a><ul>
-<li><a class="reference internal" href="#profiling-your-benchmark-points" id="id2">Profiling Your Benchmark Points</a></li>
-<li><a class="reference internal" href="#displaying-total-execution-time" id="id3">Displaying Total Execution Time</a></li>
-<li><a class="reference internal" href="#displaying-memory-consumption" id="id4">Displaying Memory Consumption</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#class-reference" id="id5">Class Reference</a></li>
-</ul>
-</div>
-<div class="custom-index container"></div><div class="section" id="using-the-benchmark-class">
-<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>
-<p>The Benchmark class can be used within your
-<a class="reference internal" href="../general/controllers.html"><span class="doc">controllers</span></a>,
-<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>.
-The process for usage is this:</p>
-<ol class="arabic simple">
-<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>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;code_start&#39;</span><span class="p">);</span>
-
-<span class="c1">// Some code happens here</span>
-
-<span class="nv">$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_end&#39;</span><span class="p">);</span>
-
-<span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">&#39;code_start&#39;</span><span class="p">,</span> <span class="s1">&#39;code_end&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p>The words “code_start” and “code_end” are arbitrary. They
-are simply words used to set two markers. You can use any words you
-want, and you can set multiple sets of markers. Consider this example:</p>
-<div class="last highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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>
-
-<span class="c1">// Some code happens here</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;cat&#39;</span><span class="p">);</span>
-
-<span class="c1">// More code happens here</span>
-
-<span class="nv">$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;bird&#39;</span><span class="p">);</span>
-
-<span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">&#39;dog&#39;</span><span class="p">,</span> <span class="s1">&#39;cat&#39;</span><span class="p">);</span>
-<span class="k">echo</span> <span class="nv">$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="s1">&#39;cat&#39;</span><span class="p">,</span> <span class="s1">&#39;bird&#39;</span><span class="p">);</span>
-<span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">&#39;dog&#39;</span><span class="p">,</span> <span class="s1">&#39;bird&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="profiling-your-benchmark-points">
-<h3><a class="toc-backref" href="#id2">Profiling Your Benchmark Points</a><a class="headerlink" href="#profiling-your-benchmark-points" title="Permalink to this headline">¶</a></h3>
-<p>If you want your benchmark data to be available to the
-<a class="reference internal" href="../general/profiling.html"><span class="doc">Profiler</span></a> all of your marked points must
-be set up in pairs, and each mark point name must end with _start and
-_end. Each pair of points must otherwise be named identically. Example:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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>
-
-<span class="c1">// Some code happens here...</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;my_mark_end&#39;</span><span class="p">);</span>
-
-<span class="nv">$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;another_mark_start&#39;</span><span class="p">);</span>
-
-<span class="c1">// Some more code happens here...</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">mark</span><span class="p">(</span><span class="s1">&#39;another_mark_end&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Please read the <a class="reference internal" href="../general/profiling.html"><span class="doc">Profiler page</span></a> for more
-information.</p>
-</div>
-<div class="section" id="displaying-total-execution-time">
-<h3><a class="toc-backref" href="#id3">Displaying Total Execution Time</a><a class="headerlink" href="#displaying-total-execution-time" title="Permalink to this headline">¶</a></h3>
-<p>If you would like to display the total elapsed time from the moment
-CodeIgniter starts to the moment the final output is sent to the
-browser, simply place this in one of your view templates:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nv">$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>
-</pre></div>
-</div>
-<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>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="p">{</span><span class="nx">elapsed_time</span><span class="p">}</span>
-</pre></div>
-</div>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">If you want to benchmark anything within your controller
-functions you must set your own start/end points.</p>
-</div>
-</div>
-<div class="section" id="displaying-memory-consumption">
-<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>
-<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>
-<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">$this</span><span class="o">-&gt;</span><span class="na">benchmark</span><span class="o">-&gt;</span><span class="na">memory_usage</span><span class="p">();</span><span class="cp">?&gt;</span>
-</pre></div>
-</div>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">This function can only be used in your view files. The consumption
-will reflect the total memory used by the entire app.</p>
-</div>
-<p>An alternate way to show your memory usage in your view files is to use
-this pseudo-variable, if you prefer not to use the pure PHP:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="p">{</span><span class="nx">memory_usage</span><span class="p">}</span>
-</pre></div>
-</div>
-</div>
-</div>
-<div class="section" id="class-reference">
-<h2><a class="toc-backref" href="#id5">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
-<dl class="class">
-<dt id="CI_Benchmark">
-<em class="property">class </em><code class="descname">CI_Benchmark</code><a class="headerlink" href="#CI_Benchmark" title="Permalink to this definition">¶</a></dt>
-<dd><dl class="method">
-<dt id="CI_Benchmark::mark">
-<code class="descname">mark</code><span class="sig-paren">(</span><em>$name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Benchmark::mark" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$name</strong> (<em>string</em>) – the name you wish to assign to your marker</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Sets a benchmark marker.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Benchmark::elapsed_time">
-<code class="descname">elapsed_time</code><span class="sig-paren">(</span><span class="optional">[</span><em>$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>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$point1</strong> (<em>string</em>) – a particular marked point</li>
-<li><strong>$point2</strong> (<em>string</em>) – a particular marked point</li>
-<li><strong>$decimals</strong> (<em>int</em>) – number of decimal places for precision</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Elapsed time</p>
-</td>
-</tr>
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Calculates and returns the time difference between two marked points.</p>
-<p>If the first parameter is empty this function instead returns the
-<code class="docutils literal"><span class="pre">{elapsed_time}</span></code> pseudo-variable. This permits the full system
-execution time to be shown in a template. The output class will
-swap the real value for this variable.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Benchmark::memory_usage">
-<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>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Memory usage info</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
-</tr>
-</tbody>
-</table>
-<p>Simply returns the <code class="docutils literal"><span class="pre">{memory_usage}</span></code> marker.</p>
-<p>This permits it to be put it anywhere in a template without the memory
-being calculated until the end. The <a class="reference internal" href="output.html"><span class="doc">Output Class</span></a> will
-swap the real value for this variable.</p>
-</dd></dl>
-
-</dd></dl>
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