Drop python2 support
This mostly consists in removing the dependency on "six" and updating
the code to use only Python3 idioms.
Notice that we previously used TemporaryDirectory from
cubicweb.devtools.testlib for compatibility with Python2. We now
directly import it from tempfile.
.. _profiling:
Profiling
=========
Profiling of requests by the pyramid debug toolbar can be a little restrictive
when a specific url needs thin profiling that includes the whole pyramid
dispatch.
Pyramid CubicWeb provides facilities to profile requests as a
:func:`wsgi middleware <cubicweb.pyramid.profile.wsgi_profile>`, and a few
views that facilitate profiling of basic features.
The views and the wsgi middleware are activated when the 'profile' option is
given. This can be done on the command line
(:option:`cubicweb-ctl pyramid --profile`) or in the :ref:`pyramid_settings`.
Views
-----
The following routes and corresponding views are provided when profiling is on:
- ``/_profile/ping``: Reply 'ping' without doing anything else. See also
:func:`cubicweb.pyramid.profile.ping`.
- ``/_profile/cnx``: Reply 'ping' after getting a cnx. See also
:func:`cubicweb.pyramid.profile.cnx`.
Typical Usage
-------------
Let's say we want to measure the cost of having a ``cnx``.
- Start the application with profile enabled:
.. code-block:: console
$ cubicweb-ctl pyramid --no-daemon --profile --profile-dump-every 100
- Use 'ab' or any other http benchmark tool to throw a lot of requests:
.. code-block:: console
$ ab -c 1 -n 100 http://localhost:8080/_profile/cnx
- Analyse the results. I personnaly fancy SnakeViz_:
.. code-block:: console
$ snakeviz program.prof
.. _SnakeViz: http://jiffyclub.github.io/snakeviz/