Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Intelligent Profiling for Python WSGI Applications
Python JavaScript
Branch: master
Failed to load latest commit information.
docs Bumping version to v0.3.1 and releasing to PyPI
examples Adding screenshots of new session listing
linesman Merge pull request #25 from GertBurger/add_delete_many
.gitignore
COPYING Adding GPL license and moving to the standard COPYING location.
ChangeLog Updating changelog and moving this to the Sphinx docs
MANIFEST.in Setuptools was not including README.rst correctly; adding MANIFEST.in…
README.rst Added link to changelog to documentation.
ez_setup.py
setup.cfg Setuptools was not including README.rst correctly; adding MANIFEST.in…
setup.py Bumping version to v0.3.1 and releasing to PyPI

README.rst

linesman is a much needed profiler-for-WSGI applications. It installs as middleware, can be configured entirely from any paster config, and aims to be a jack-of-all-trades when it comes to profiling WSGI apps.

Since a picture is worth a thousand words, here are a few screenshots of the interface:

The changelog can always be viewed from the source, or on PyPi. Keep in mind, PyPi is only updated with each release, and does not include development documentation.

Reasoning behind this library

One of my team's stories at work was to investigate existing Python profiling tools for use with some of our new web stacks (all in Pylons). I looked at a few--repoze.profile, kea.profile, and even dozer (still in 0.2alpha)--but couldn't find any that suited our use case. We wanted to...

  • visualize the flow of our code
  • identify bottlenecks quickly and easily
  • have the ability to strip out extraneous calls

Many of the tools simply outputted the pstats object from cProfile, which can be difficult to parse, and even more difficult to identify the call order. Considering that cProfile provided all the information needed, I figured it would be just as easy to write our own middleware.

linesman is a name given to people who inspect electrical Pylons, and was a meek attempt at having a relevant library name.

Setting up middleware

Now, you'll need to tell your WSGI application how to use Linesman. Assuming you're using Paster, you can do this very easily in your development.ini (or similar) config file. Add a new filter section:

[filter:linesman]
use = egg:linesman#profiler

Then, find the section for your specific application. Typically, it will have a section header that looks like [app:main]. Add the following config option somewhere within this section:

filter-with = linesman

Wallah! Once you start your paster server, you'll be all set. Verify that all is working correctly by accessing pages on your server. This will also create profile entries for the next step.

Accessing the profiles

This will assume that your application is mounted at the root directory, /, and that your server is running on localhost at port 5000. If not, make sure you adjust your URLs accordingly.

Access the URL at http://127.0.0.1:5000/__profiler__, which should present you with a list of profiles and times, with a link to the stats page. If you can see this (and view the profiles), then you're all set!

Happy profiling!

Something went wrong with that request. Please try again.