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<div class="section" id="profiling">
<h1>Profiling<a class="headerlink" href="#profiling" title="Permalink to this headline">¶</a></h1>
<div class="section" id="using-profilers">
<h2>Using profilers<a class="headerlink" href="#using-profilers" title="Permalink to this headline">¶</a></h2>
<p>Bazaar has some built-in support for collecting and saving profiling
information. In the simpliest case, the <tt class="docutils literal"><span class="pre">--lsprof</span></tt> option can be used as
shown below:</p>
<div class="highlight-python"><div class="highlight"><pre>bzr --lsprof ...
</pre></div>
</div>
<p>This will dump the profiling information to stdout before exiting.
Alternatively, the <tt class="docutils literal"><span class="pre">--lsprof-file</span></tt> option can be used to specify a filename
to save the profiling data into to. By default, profiling data saved to a
file is a pickled Python object making it possible to reload the data and
do with it what you will. For convenience though:</p>
<ul class="simple">
<li>if the filename ends in <tt class="docutils literal"><span class="pre">.txt</span></tt>, it will be dumped in a text format.</li>
<li>if the filename either starts with <tt class="docutils literal"><span class="pre">callgrind.out</span></tt> or ends with
<tt class="docutils literal"><span class="pre">.callgrind</span></tt>, it will be converted to a format loadable by the
KCacheGrind visualization tool.</li>
</ul>
<p>Note that KCacheGrind’s Open Dialog has a default filter than only shows
files starting with <tt class="docutils literal"><span class="pre">callgrind.out</span></tt> so the longer filename is usually
preferable. Here is an example of how to use the <tt class="docutils literal"><span class="pre">--lsprof-file</span></tt> option
in combination with KCacheGrind to visualize what the <tt class="docutils literal"><span class="pre">status</span></tt> command
is doing:</p>
<div class="highlight-python"><div class="highlight"><pre>bzr --lsprof-file callgrind.out.st001 status
kcachegrind callgrind.out.st001 &
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">bzr also has a <tt class="docutils literal"><span class="pre">--profile</span></tt> option that uses the hotshot profiler
instead of the lsprof profiler. The hotshot profiler can be useful
though the lsprof one is generally recommended. See
<a class="reference external" href="http://docs.python.org/lib/node795.html">http://docs.python.org/lib/node795.html</a>.</p>
</div>
<p>Note that to use <tt class="docutils literal"><span class="pre">--lsprof</span></tt> you must install the lsprof module, which you
can get with:</p>
<div class="highlight-python"><div class="highlight"><pre>svn co http://codespeak.net/svn/user/arigo/hack/misc/lsprof
</pre></div>
</div>
</div>
<div class="section" id="profiling-locks">
<h2>Profiling locks<a class="headerlink" href="#profiling-locks" title="Permalink to this headline">¶</a></h2>
<p>Bazaar can log when locks are taken or released, which can help in
identifying unnecessary lock traffic. This is activated by the <tt class="docutils literal"><span class="pre">-Dlock</span></tt>
global option.</p>
<p>This writes messages into <tt class="docutils literal"><span class="pre">~/.bzr.log</span></tt>.
At present this only logs actions relating to the on-disk lockdir. It
doesn’t describe actions on in-memory lock counters, or OS locks (which
are used for dirstate.)</p>
</div>
<div class="section" id="profiling-hpss-requests">
<h2>Profiling HPSS Requests<a class="headerlink" href="#profiling-hpss-requests" title="Permalink to this headline">¶</a></h2>
<p>When trying to improve network performance, it is often useful to know
what requests are being made, and how long they are taking. The <tt class="docutils literal"><span class="pre">-Dhpss</span></tt>
global option will enable logging smart server requests, including the
time spent in each request.</p>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Profiling</a><ul>
<li><a class="reference internal" href="#using-profilers">Using profilers</a></li>
<li><a class="reference internal" href="#profiling-locks">Profiling locks</a></li>
<li><a class="reference internal" href="#profiling-hpss-requests">Profiling HPSS Requests</a></li>
</ul>
</li>
</ul>
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title="next chapter">Tracking Bugs in Bazaar</a></p>
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