703 lines
47 KiB
HTML
Executable File
703 lines
47 KiB
HTML
Executable File
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<title>Benchmarking Class — CodeIgniter 3.1.11 documentation</title>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current">
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<li class="toctree-l2 current"><a class="current reference internal" href="#">Benchmarking Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching Driver</a></li>
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<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="config.html">Config Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="encrypt.html">Encrypt Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="trackback.html">Trackback Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
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</ul>
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</li>
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</ul>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">Benchmarking Class</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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<div role="main" class="document">
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<div class="section" id="benchmarking-class">
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<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>
|
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</li>
|
||
<li><a class="reference internal" href="#class-reference" id="id5">Class Reference</a></li>
|
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</ul>
|
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</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">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">mark</span><span class="p">(</span><span class="s1">'code_start'</span><span class="p">);</span>
|
||
|
||
<span class="c1">// Some code happens here</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">mark</span><span class="p">(</span><span class="s1">'code_end'</span><span class="p">);</span>
|
||
|
||
<span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">'code_start'</span><span class="p">,</span> <span class="s1">'code_end'</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="first admonition-title">Note</p>
|
||
<p>The words “code_start” and “code_end” are arbitrary. They
|
||
are simply words used to set two markers. You can use any words you
|
||
want, and you can set multiple sets of markers. Consider this example:</p>
|
||
<div class="last highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">mark</span><span class="p">(</span><span class="s1">'dog'</span><span class="p">);</span>
|
||
|
||
<span class="c1">// Some code happens here</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">mark</span><span class="p">(</span><span class="s1">'cat'</span><span class="p">);</span>
|
||
|
||
<span class="c1">// More code happens here</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">mark</span><span class="p">(</span><span class="s1">'bird'</span><span class="p">);</span>
|
||
|
||
<span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">'dog'</span><span class="p">,</span> <span class="s1">'cat'</span><span class="p">);</span>
|
||
<span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">'cat'</span><span class="p">,</span> <span class="s1">'bird'</span><span class="p">);</span>
|
||
<span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">elapsed_time</span><span class="p">(</span><span class="s1">'dog'</span><span class="p">,</span> <span class="s1">'bird'</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="profiling-your-benchmark-points">
|
||
<h3><a class="toc-backref" href="#id2">Profiling Your Benchmark Points</a><a class="headerlink" href="#profiling-your-benchmark-points" title="Permalink to this headline">¶</a></h3>
|
||
<p>If you want your benchmark data to be available to the
|
||
<a class="reference internal" href="../general/profiling.html"><span class="doc">Profiler</span></a> all of your marked points must
|
||
be set up in pairs, and each mark point name must end with _start and
|
||
_end. Each pair of points must otherwise be named identically. Example:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">mark</span><span class="p">(</span><span class="s1">'my_mark_start'</span><span class="p">);</span>
|
||
|
||
<span class="c1">// Some code happens here...</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">mark</span><span class="p">(</span><span class="s1">'my_mark_end'</span><span class="p">);</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">mark</span><span class="p">(</span><span class="s1">'another_mark_start'</span><span class="p">);</span>
|
||
|
||
<span class="c1">// Some more code happens here...</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">mark</span><span class="p">(</span><span class="s1">'another_mark_end'</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Please read the <a class="reference internal" href="../general/profiling.html"><span class="doc">Profiler page</span></a> for more
|
||
information.</p>
|
||
</div>
|
||
<div class="section" id="displaying-total-execution-time">
|
||
<h3><a class="toc-backref" href="#id3">Displaying Total Execution Time</a><a class="headerlink" href="#displaying-total-execution-time" title="Permalink to this headline">¶</a></h3>
|
||
<p>If you would like to display the total elapsed time from the moment
|
||
CodeIgniter starts to the moment the final output is sent to the
|
||
browser, simply place this in one of your view templates:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">elapsed_time</span><span class="p">();</span><span class="cp">?></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"><?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">benchmark</span><span class="o">-></span><span class="na">memory_usage</span><span class="p">();</span><span class="cp">?></span>
|
||
</pre></div>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="first admonition-title">Note</p>
|
||
<p class="last">This function can only be used in your view files. The consumption
|
||
will reflect the total memory used by the entire app.</p>
|
||
</div>
|
||
<p>An alternate way to show your memory usage in your view files is to use
|
||
this pseudo-variable, if you prefer not to use the pure PHP:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="p">{</span><span class="nx">memory_usage</span><span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="class-reference">
|
||
<h2><a class="toc-backref" href="#id5">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
|
||
<dl class="class">
|
||
<dt id="CI_Benchmark">
|
||
<em class="property">class </em><code class="descname">CI_Benchmark</code><a class="headerlink" href="#CI_Benchmark" title="Permalink to this definition">¶</a></dt>
|
||
<dd><dl class="method">
|
||
<dt id="CI_Benchmark::mark">
|
||
<code class="descname">mark</code><span class="sig-paren">(</span><em>$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>
|
||
</div>
|
||
|
||
|
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|
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|
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|
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<p>
|
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© Copyright 2014 - 2019, British Columbia Institute of Technology.
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Last updated on Sep 19, 2019.
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