jmelesky
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<title>profile/cProfile as the module of the month</title>

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<div class='slide'>
<h1>profile/cProfile</h1>

<p>John Melesky
(PDX Python, May 2010)</p>

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<div class='slide'>
<h1>In the standard library</h1>

<ul>
<li>hotshot</li>
<li>timeit</li>
<li>profile/cprofile/pstats</li>
</ul>

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<h1>hotshot</h1>

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<h1>timeit</h1>

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<h1>profile/cProfile</h1>

<p>Instead of:</p>

<pre><code>if __name__ == '__main__':
    main()
</code></pre>

<p>Do:</p>

<pre><code>if __name__ == '__main__':
    import cProfile
    cProfile.run('main()')
</code></pre>

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<div class='slide'>
<h1>Questions?</h1>

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<div class='slide'>
<h1>Need more detail!</h1>

</div>


<div class='slide'>
<h1>Need more detail!</h1>

<p>Instead of:</p>

<pre><code>if __name__ == '__main__':
    import cProfile
    cProfile.run('main()')
</code></pre>

<p>Do:</p>

<pre><code>if __name__ == '__main__':
    import cProfile
    cProfile.run('main()', 'myinfo.prof')
</code></pre>

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<div class='slide'>
<h1>side note</h1>

<p>If you need to set up an environment, you can use <code>cProfile.runctx(command, globals, locals)</code>.</p>

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<div class='slide'>
<h1>Need more detail!</h1>

<p>Then:</p>

<pre><code>#!/usr/bin/env python

import pstats

p = pstats.Stats('myinfo.prof')
p.strip_dirs().sort_stats("time").print_stats(50)
</code></pre>

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<div class='slide'>
<h1>pstats</h1>

<ul>
<li><code>strip_dirs</code></li>
<li><code>sort_stats</code>: "calls", "cumulative", "pcalls", "time", etc</li>
<li><code>print_stats</code>: restrictable (number of rows, regular expression)</li>
</ul>

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<h1>pstats</h1>

<p>Also:</p>

<ul>
<li><code>print_callers</code></li>
<li><code>print_callees</code></li>
<li><code>reverse_order</code></li>
<li><code>dump_stats</code></li>
</ul>

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<div class='slide'>
<h1>pstats</h1>

<p>Finally:</p>

<ul>
<li><code>add</code></li>
</ul>

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<div class='slide'>
<h1>Whine whine whine</h1>

<p>It's only usable from the command line!</p>

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<h1>It's been wrapped</h1>

<p>See, for example, <a href="http://pypi.python.org/pypi/repoze.profile">repoze.profile</a>.</p>

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<div class='slide'>
<h1>Questions?</h1>

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<div class='slide'>
<p></p>

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<p></p>

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