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Profiling
=========
Using profilers
---------------
Bazaar has some built-in support for collecting and saving profiling
information. In the simpliest case, the ``--lsprof`` option can be used as
shown below::
bzr --lsprof ...
This will dump the profiling information to stdout before exiting.
Alternatively, the ``--lsprof-file`` 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:
* if the filename ends in ``.txt``, it will be dumped in a text format.
* if the filename either starts with ``callgrind.out`` or ends with
``.callgrind``, it will be converted to a format loadable by the
KCacheGrind visualization tool.
Note that KCacheGrind's Open Dialog has a default filter than only shows
files starting with ``callgrind.out`` so the longer filename is usually
preferable. Here is an example of how to use the ``--lsprof-file`` option
in combination with KCacheGrind to visualize what the ``status`` command
is doing::
bzr --lsprof-file callgrind.out.st001 status
kcachegrind callgrind.out.st001 &
.. Note:: bzr also has a ``--profile`` 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
http://docs.python.org/lib/node795.html.
Note that to use ``--lsprof`` you must install the lsprof module, which you
can get with::
svn co http://codespeak.net/svn/user/arigo/hack/misc/lsprof
Profiling locks
---------------
Bazaar can log when locks are taken or released, which can help in
identifying unnecessary lock traffic. This is activated by the ``-Dlock``
global option.
This writes messages into ``~/.bzr.log``.
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.)
Profiling HPSS Requests
-----------------------
When trying to improve network performance, it is often useful to know
what requests are being made, and how long they are taking. The ``-Dhpss``
global option will enable logging smart server requests, including the
time spent in each request.
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