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  <div class="section" id="profiling-your-application">
<h1>Profiling Your Application<a class="headerlink" href="#profiling-your-application" title="Permalink to this headline">¶</a></h1>
<p>The Profiler Class will display benchmark results, queries you have run,
and <tt class="docutils literal"><span class="pre">$_POST</span></tt> data at the bottom of your pages. This information can be
useful during development in order to help with debugging and
optimization.</p>
<div class="section" id="initializing-the-class">
<h2>Initializing the Class<a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h2>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">This class does NOT need to be initialized. It is loaded
automatically by the <a class="reference internal" href="../libraries/output.html"><em>Output Library</em></a>
if profiling is enabled as shown below.</p>
</div>
</div>
<div class="section" id="enabling-the-profiler">
<h2>Enabling the Profiler<a class="headerlink" href="#enabling-the-profiler" title="Permalink to this headline">¶</a></h2>
<p>To enable the profiler place the following line anywhere within your
<a class="reference internal" href="controllers.html"><em>Controller</em></a> methods:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">output</span><span class="o">-&gt;</span><span class="na">enable_profiler</span><span class="p">(</span><span class="k">TRUE</span><span class="p">);</span>
</pre></div>
</div>
<p>When enabled a report will be generated and inserted at the bottom of
your pages.</p>
<p>To disable the profiler you will use:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">output</span><span class="o">-&gt;</span><span class="na">enable_profiler</span><span class="p">(</span><span class="k">FALSE</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="setting-benchmark-points">
<h2>Setting Benchmark Points<a class="headerlink" href="#setting-benchmark-points" title="Permalink to this headline">¶</a></h2>
<p>In order for the Profiler to compile and display your benchmark data you
must name your mark points using specific syntax.</p>
<p>Please read the information on setting Benchmark points in the
<a class="reference internal" href="../libraries/benchmark.html"><em>Benchmark Library</em></a> page.</p>
</div>
<div class="section" id="enabling-and-disabling-profiler-sections">
<h2>Enabling and Disabling Profiler Sections<a class="headerlink" href="#enabling-and-disabling-profiler-sections" title="Permalink to this headline">¶</a></h2>
<p>Each section of Profiler data can be enabled or disabled by setting a
corresponding config variable to TRUE or FALSE. This can be done one of
two ways. First, you can set application wide defaults with the
<em>application/config/profiler.php</em> config file.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;config&#39;</span><span class="p">]</span>          <span class="o">=</span> <span class="k">FALSE</span><span class="p">;</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;queries&#39;</span><span class="p">]</span>         <span class="o">=</span> <span class="k">FALSE</span><span class="p">;</span>
</pre></div>
</div>
<p>In your controllers, you can override the defaults and config file
values by calling the <tt class="docutils literal"><span class="pre">set_profiler_sections()</span></tt> method of the
<a class="reference internal" href="../libraries/output.html"><em>Output Library</em></a>:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$sections</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
        <span class="s1">&#39;config&#39;</span>  <span class="o">=&gt;</span> <span class="k">TRUE</span><span class="p">,</span>
        <span class="s1">&#39;queries&#39;</span> <span class="o">=&gt;</span> <span class="k">TRUE</span>
<span class="p">);</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">output</span><span class="o">-&gt;</span><span class="na">set_profiler_sections</span><span class="p">(</span><span class="nv">$sections</span><span class="p">);</span>
</pre></div>
</div>
<p>Available sections and the array key used to access them are described
in the table below.</p>
<table border="1" class="docutils">
<colgroup>
<col width="23%" />
<col width="68%" />
<col width="8%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Key</th>
<th class="head">Description</th>
<th class="head">Default</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td><strong>benchmarks</strong></td>
<td>Elapsed time of Benchmark points and total execution time</td>
<td>TRUE</td>
</tr>
<tr class="row-odd"><td><strong>config</strong></td>
<td>CodeIgniter Config variables</td>
<td>TRUE</td>
</tr>
<tr class="row-even"><td><strong>controller_info</strong></td>
<td>The Controller class and method requested</td>
<td>TRUE</td>
</tr>
<tr class="row-odd"><td><strong>get</strong></td>
<td>Any GET data passed in the request</td>
<td>TRUE</td>
</tr>
<tr class="row-even"><td><strong>http_headers</strong></td>
<td>The HTTP headers for the current request</td>
<td>TRUE</td>
</tr>
<tr class="row-odd"><td><strong>memory_usage</strong></td>
<td>Amount of memory consumed by the current request, in bytes</td>
<td>TRUE</td>
</tr>
<tr class="row-even"><td><strong>post</strong></td>
<td>Any POST data passed in the request</td>
<td>TRUE</td>
</tr>
<tr class="row-odd"><td><strong>queries</strong></td>
<td>Listing of all database queries executed, including execution time</td>
<td>TRUE</td>
</tr>
<tr class="row-even"><td><strong>uri_string</strong></td>
<td>The URI of the current request</td>
<td>TRUE</td>
</tr>
<tr class="row-odd"><td><strong>session_data</strong></td>
<td>Data stored in the current session</td>
<td>TRUE</td>
</tr>
<tr class="row-even"><td><strong>query_toggle_count</strong></td>
<td>The number of queries after which the query block will default to
hidden.</td>
<td>25</td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Disabling the <a class="reference internal" href="../database/configuration.html"><em>save_queries</em></a> setting in
your database configuration will also effectively disable profiling for
database queries and render the &#8216;queries&#8217; setting above useless. You can
optionally override this setting with <tt class="docutils literal"><span class="pre">$this-&gt;db-&gt;save_queries</span> <span class="pre">=</span> <span class="pre">TRUE;</span></tt>.
Without this setting you won&#8217;t be able to view the queries or the
<cite>last_query &lt;database/helpers&gt;</cite>.</p>
</div>
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