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  <div class="section" id="benchmarking">
<h1>Benchmarking<a class="headerlink" href="#benchmarking" title="Permalink to this headline">¶</a></h1>
<p>CodeIgniter provides two separate tools to help you benchmark your code and test different options:
the Timer and the Iterator. The Timer allows you to easily calculate the time between two points in the
execution of your script. The Iterator allows you to set up several variations and runs those tests, recording
performance and memory statistics to help you decide which version is the best.</p>
<p>The Timer class is always active, being started from the moment the framework is invoked until right before
sending the output to the user, enabling a very accurate timing of the entire system execution.</p>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#using-the-timer" id="id1">Using the Timer</a><ul>
<li><a class="reference internal" href="#viewing-your-benchmark-points" id="id2">Viewing Your Benchmark Points</a></li>
<li><a class="reference internal" href="#displaying-execution-time" id="id3">Displaying Execution Time</a></li>
</ul>
</li>
<li><a class="reference internal" href="#using-the-iterator" id="id4">Using the Iterator</a><ul>
<li><a class="reference internal" href="#creating-tasks-to-run" id="id5">Creating Tasks To Run</a></li>
<li><a class="reference internal" href="#running-the-tasks" id="id6">Running the Tasks</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="using-the-timer">
<h2><a class="toc-backref" href="#id1">Using the Timer</a><a class="headerlink" href="#using-the-timer" title="Permalink to this headline">¶</a></h2>
<p>With the Timer, you can measure the time between two moments in the execution of your application. This makes
it simple to measure the performance of different aspects of your application. All measurement is done using
the <code class="docutils literal notranslate"><span class="pre">start()</span></code> and <code class="docutils literal notranslate"><span class="pre">stop()</span></code> methods.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">start()</span></code> methods takes a single parameter: the name of this timer. You can use any string as the name
of the timer. It is only used for you to reference later to know which measurement is which:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$benchmark</span> <span class="o">=</span> <span class="nx">\Config\Services</span><span class="o">::</span><span class="na">timer</span><span class="p">();</span>
<span class="nv">$benchmark</span><span class="o">-&gt;</span><span class="na">start</span><span class="p">(</span><span class="s1">&#39;render view&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">stop()</span></code> method takes the name of the timer that you want to stop as the only parameter, also:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$benchmark</span><span class="o">-&gt;</span><span class="na">stop</span><span class="p">(</span><span class="s1">&#39;render view&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>The name is not case-sensitive, but otherwise must match the name you gave it when you started the timer.</p>
<p>Alternatively, you can use the <a class="reference internal" href="../general/common_functions.html"><span class="doc">global function</span></a> <code class="docutils literal notranslate"><span class="pre">timer()</span></code> to start
and stop timers:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="c1">// Start the timer</span>
<span class="nx">timer</span><span class="p">(</span><span class="s1">&#39;render view&#39;</span><span class="p">);</span>
<span class="c1">// Stop a running timer,</span>
<span class="c1">// if one of this name has been started</span>
<span class="nx">timer</span><span class="p">(</span><span class="s1">&#39;render view&#39;</span><span class="p">);</span>
</pre></div>
</div>
<div class="section" id="viewing-your-benchmark-points">
<h3><a class="toc-backref" href="#id2">Viewing Your Benchmark Points</a><a class="headerlink" href="#viewing-your-benchmark-points" title="Permalink to this headline">¶</a></h3>
<p>When your application runs, all of the timers that you have set are collected by the Timer class. It does
not automatically display them, though. You can retrieve all of your timers by calling the <code class="docutils literal notranslate"><span class="pre">getTimers()</span></code> method.
This returns an array of benchmark information, including start, end, and duration:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$timers</span> <span class="o">=</span> <span class="nv">$benchmark</span><span class="o">-&gt;</span><span class="na">getTimers</span><span class="p">();</span>

<span class="c1">// Timers =</span>
<span class="p">[</span>
    <span class="s1">&#39;render view&#39;</span>  <span class="o">=&gt;</span> <span class="p">[</span>
        <span class="s1">&#39;start&#39;</span>    <span class="o">=&gt;</span> <span class="mi">1234567890</span><span class="p">,</span>
        <span class="s1">&#39;end&#39;</span>      <span class="o">=&gt;</span> <span class="mi">1345678920</span><span class="p">,</span>
        <span class="s1">&#39;duration&#39;</span> <span class="o">=&gt;</span> <span class="mf">15.4315</span>      <span class="c1">// number of seconds</span>
    <span class="p">]</span>
<span class="p">]</span>
</pre></div>
</div>
<p>You can change the precision of the calculated duration by passing in the number of decimal places you want to be shown as
the only parameter. The default value is 4 numbers behind the decimal point:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$timers</span> <span class="o">=</span> <span class="nv">$benchmark</span><span class="o">-&gt;</span><span class="na">getTimers</span><span class="p">(</span><span class="mi">6</span><span class="p">);</span>
</pre></div>
</div>
<p>The timers are automatically displayed in the <a class="reference internal" href="debugging.html"><span class="doc">Debub Toolbar</span></a>.</p>
</div>
<div class="section" id="displaying-execution-time">
<h3><a class="toc-backref" href="#id3">Displaying Execution Time</a><a class="headerlink" href="#displaying-execution-time" title="Permalink to this headline">¶</a></h3>
<p>While the <code class="docutils literal notranslate"><span class="pre">getTimers()</span></code> method will give you the raw data for all of the timers in your project, you can retrieve
the duration of a single timer, in seconds, with the <cite>getElapsedTime()</cite> method. The first parameter is the name of
the timer to display. The second is the number of decimal places to display. This defaults to 4:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nx">timer</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">getElapsedTime</span><span class="p">(</span><span class="s1">&#39;render view&#39;</span><span class="p">);</span>
<span class="c1">// Displays: 0.0234</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="using-the-iterator">
<h2><a class="toc-backref" href="#id4">Using the Iterator</a><a class="headerlink" href="#using-the-iterator" title="Permalink to this headline">¶</a></h2>
<p>The Iterator is a simple tool that is designed to allow you to try out multiple variations on a solution to
see the speed differences and different memory usage patterns. You can add any number of “tasks” for it to
run and the class will run the task hundreds or thousands of times to get a clearer picture of performance.
The results can then be retrieved and used by your script, or displayed as an HTML table.</p>
<div class="section" id="creating-tasks-to-run">
<h3><a class="toc-backref" href="#id5">Creating Tasks To Run</a><a class="headerlink" href="#creating-tasks-to-run" title="Permalink to this headline">¶</a></h3>
<p>Tasks are defined within Closures. Any output the task creates will be discarded automatically. They are
added to the Iterator class through the <cite>add()</cite> method. The first parameter is a name you want to refer to
this test by. The second parameter is the Closure, itself:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$iterator</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">\CodeIgniter\Benchmark\Iterator</span><span class="p">();</span>

<span class="c1">// Add a new task</span>
<span class="nv">$iterator</span><span class="o">-&gt;</span><span class="na">add</span><span class="p">(</span><span class="s1">&#39;single_concat&#39;</span><span class="p">,</span> <span class="k">function</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="nv">$str</span> <span class="o">=</span> <span class="s1">&#39;Some basic&#39;</span><span class="o">.</span><span class="s1">&#39;little&#39;</span><span class="o">.</span><span class="s1">&#39;string concatenation test.&#39;</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">);</span>

<span class="c1">// Add another task</span>
<span class="nv">$iterator</span><span class="o">-&gt;</span><span class="na">add</span><span class="p">(</span><span class="s1">&#39;double&#39;</span><span class="p">,</span> <span class="k">function</span><span class="p">(</span><span class="nv">$a</span><span class="o">=</span><span class="s1">&#39;little&#39;</span><span class="p">)</span>
    <span class="p">{</span>
        <span class="nv">$str</span> <span class="o">=</span> <span class="s2">&quot;Some basic </span><span class="si">{</span><span class="nv">$little</span><span class="si">}</span><span class="s2"> string test.&quot;</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="running-the-tasks">
<h3><a class="toc-backref" href="#id6">Running the Tasks</a><a class="headerlink" href="#running-the-tasks" title="Permalink to this headline">¶</a></h3>
<p>Once you’ve added the tasks to run, you can use the <code class="docutils literal notranslate"><span class="pre">run()</span></code> method to loop over the tasks many times.
By default, it will run each task 1000 times. This is probably sufficient for most simple tests. If you need
to run the tests more times than that, you can pass the number as the first parameter:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="c1">// Run the tests 3000 times.</span>
<span class="nv">$iterator</span><span class="o">-&gt;</span><span class="na">run</span><span class="p">(</span><span class="mi">3000</span><span class="p">);</span>
</pre></div>
</div>
<p>Once it has run, it will return an HTML table with the results of the test. If you don’t want the results
displayed, you can pass in <cite>false</cite> as the second parameter:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="c1">// Don&#39;t display the results.</span>
<span class="nv">$iterator</span><span class="o">-&gt;</span><span class="na">run</span><span class="p">(</span><span class="mi">1000</span><span class="p">,</span> <span class="k">false</span><span class="p">);</span>
</pre></div>
</div>
</div>
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