wangsaitao
/
guotianyun-sp-yh


			
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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>

</div>
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