Simon Willison's Weblog: wsgi

Quoting Using async and await in Flask 2.0

2021-05-12T17:59:51+00:00

Async functions require an event loop to run. Flask, as a WSGI application, uses one worker to handle one request/response cycle. When a request comes in to an async view, Flask will start an event loop in a thread, run the view function there, then return the result.

Each request still ties up one worker, even for async views. The upside is that you can run async code within a view, for example to make multiple concurrent database queries, HTTP requests to an external API, etc. However, the number of requests your application can handle at one time will remain the same.

— Using async and await in Flask 2.0

Tags: async, flask, python, wsgi

The First Few Weeks - ep.io

2011-01-13T04:25:00+00:00

The First Few Weeks - ep.io

Another take on managed Python Django/WSGI hosting, from Andrew Godwin and Ben Firshman.

Tags: andrew-godwin, ben-firshman, django, hosting, python, wsgi, recovered

The Web Server Benchmarking We Need

2010-03-17T10:05:35+00:00

The Web Server Benchmarking We Need

Ian Bicking asks for a WSGI benchmark which emphasises error handling over raw performance—can the server keep serving requests if some of them are CPU bound, I/O bound, wedged or cause a segfault?

Tags: benchmarks, ian-bicking, python, wsgi

Why toppcloud will not be agnostic

2010-02-12T09:21:32+00:00

Why toppcloud will not be agnostic

Ian Bicking’s toppcloud aims to offer deployment with the ease of use of AppEngine against a standard, open source Ubuntu + Python 2.6 + mod_wsgi + Varnish stack. Here he explains why he’s not going to vary the required components: keeping everything completely standardised means everyone gets the same bugs (and the same fixes).

Tags: deployment, django, google-app-engine, ian-bicking, modwsgi, python, toppcloud, ubuntu, varnish, wsgi

Fabric, Django, Git, Apache, mod_wsgi, virtualenv and pip deployment

2009-07-28T11:56:09+00:00

Fabric, Django, Git, Apache, mod_wsgi, virtualenv and pip deployment

I’m slowly working my way through this stack at the moment—next stop, fabric.

Tags: apache, deployment, django, fabric, gareth-rushgrove, git, modwsgi, pip, python, virtualenv, wsgi

Finding and fixing memory leaks in Python

2009-04-22T12:16:32+00:00

Finding and fixing memory leaks in Python

Using Dozer, a clever piece of WSGI middleware which displays sparklines of Python object counts and allows you to introspect them, using the gc module under the hood.

Tags: amir-salihefendic, debugging, memory, memoryleaks, middleware, python, wsgi

How to use Django with Apache and mod_wsgi

2009-04-01T00:24:04+00:00

How to use Django with Apache and mod_wsgi

My favourite deployment option is now included in the official Django docs, thanks to Alex Gaynor. I tend to run a stripped down Apache with mod_wsgi behind an nginx proxy, and have nginx serve static files directly. This avoids the need for a completely separate media server (although a separate media domain is still a good idea for better client-side performance).

Tags: alex-gaynor, deployment, django, modwsgi, nginx, proxies, python, wsgi

Future roadmap for mod_wsgi

2009-03-19T17:27:01+00:00

Future roadmap for mod_wsgi

mod_wsgi 3.0 isn’t too far off, and will include Python 3.0 support, WSGI application preloading and internal web server redirection (similar to nginx X-Accel-Redirect). Version 4.0 plans a major architectural change that will allow multiple versions of Python to be run from the same Apache.

Tags: apache, graham-dumpleton, modwsgi, nginx, python, wsgi

Load spikes and excessive memory usage in mod_python

2009-03-16T17:26:59+00:00

Load spikes and excessive memory usage in mod_python

“The final answer? Stop using mod_python, use mod_wsgi and run it with daemon mode instead. You will save yourself a lot of headaches by doing so.”

Tags: apache, graham-dumpleton, modpython, modwsgi, python, wsgi

Concurrence

2009-03-15T13:28:11+00:00

Concurrence

Exciting: a Python framework for “creating massively concurrent network applications” (the tutorial benchmarks a Hello World web server at over 8,000 requests a second). It’s implemented on top of libevent using pyrex, can run on either Stackless Python or Greenlets from the py library and ships with a WSGI server, an HTTP client and a DBAPI 2.0 compliant MySQL driver.

Tags: greenlets, http, libevent, mysql, pyrex, python, stacklesspython, wsgi

Ruby on Rails 2.3 Release Notes

2009-03-15T13:22:11+00:00

Ruby on Rails 2.3 Release Notes

I’m impressed with how thoroughly Rails has embraced Rack (Ruby’s standardised web framework API, inspired by Python’s WSGI).

Tags: python, rack, rails, ruby, wsgi

FAPWS3-0.2 (WSGI server based on libev)

2009-02-25T22:21:44+00:00

FAPWS3-0.2 (WSGI server based on libev)

Another strong contender for Python’s answer to Mongrel—3500 requests/s for static files, 43 for a simple dynamic (Django powered) pages and 4.8 for a heavy SQL query—all benchmarked with 300 concurrent requests.

Tags: django, fapws, mongrel, python, webservers, wsgi

modswgi: Debugging Techniques

2008-05-25T13:34:42+00:00

modswgi: Debugging Techniques

mod_wsgi is excellent software, and the documentation is equally superb. I used these instructions recently to run the Python debugger inside a running instance of Apache, which helped my track down some import errors that weren’t occurring with Django’s development server.

Tags: debugging, django, modwsgi, pdb, python, wsgi

Google App Engine

2008-04-08T07:25:35+00:00

Google App Engine

Write applications in Python using a WSGI compatible application framework, then host them on Google’s highly scalable infrastructure. The most exciting part is probably the Datastore API, which provides external developers with access to Bigtable for the first time.

Tags: bigtable, google, google-app-engine, python, scaling, virtualisation, wsgi

Setup mod_wsgi for Django and Shared Hosting

2008-03-26T14:42:02+00:00

Setup mod_wsgi for Django and Shared Hosting

Tutorial by David Cramer; attached are useful comments from mod_wsgi author Graham Dumpleton.

Tags: david-cramer, django, graham-dumpleton, hosting, modwsgi, python, wsgi

Version 2.0 of mod_wsgi is now available

2008-03-21T13:23:11+00:00

Version 2.0 of mod_wsgi is now available

Includes features that should make Python (and Django) on shared hosting much easier: a non-root user can touch their WSGI script file to restart just their application’s daemon processes when they make changes and Python virtual environments are supported to allow different versions of packages without interference.

Tags: django, hosting, modwsgi, python, sharedhosting, wsgi

django-evserver

2008-01-19T12:15:15+00:00

django-evserver

Marek Majkowski got Comet working with Django using a custom WSGI server that wraps libevent using ctypes.

Tags: comet, ctypes, django, djangoevserver, libevent, marekmajkowski, python, wsgi

mod_wsgi 1.0 Release Candiate Available

2007-07-26T20:21:11+00:00

mod_wsgi 1.0 Release Candiate Available

mod_wsgi is shaping up to be an excellent alternative to mod_python.

Tags: django, modpython, modwsgi, python, wsgi

Web hosting landscape and mod_wsgi

2007-07-02T15:47:59+00:00

Web hosting landscape and mod_wsgi

Graham Dumpleton explains how mod_wsgi’s daemon mode should provide secure Python deployment for commodity hosting providers.

Tags: graham-dumpleton, hosting, modwsgi, python, wsgi

Wait For It

2007-06-09T16:53:14+00:00

Wait For It

Neat WSGI middleware from Ian Bicking that launches a thread for every incoming request and watches for slow responses; if something is taking too long it returns a “please wait” page to the user and polls for completion.

Via Ian Bicking

Tags: ian-bicking, middleware, python, wsgi

modwsgi

2007-04-14T09:48:58+00:00

modwsgi

Apache module (written in C) for hosting Python WSGI applications, no mod_python required. Includes Django integration instructions. Has anyone tried this out?

Tags: apache, django, python, wsgi

Rack

2007-03-04T20:49:01+00:00

Rack

“Rack provides an minimal interface between webservers supporting Ruby and Ruby frameworks”. Ruby’s equivalent of WSGI has just hit v0.1.

Tags: rack, ruby, wsgi

WSGI Wiki: url_vars specification

2006-11-01T12:15:23+00:00

WSGI Wiki: url_vars specification

Another neat piece of the WSGI puzzle, has the potential to play nicely with Django.

Tags: wsgi

Introducing WSGI: Python's Secret Web Weapon

2006-09-28T14:24:43+00:00

Introducing WSGI: Python's Secret Web Weapon

Every Python web developer should understand WSGI.

Tags: python, wsgi

WPHP

2006-07-27T23:01:09+00:00

WPHP

Run PHP under your Python WSGI app. Not nearly as crazy as it sounds.

Tags: php, python, wsgi

selector - WSGI Delegation

2006-04-17T12:13:27+00:00

selector - WSGI Delegation

Neat URL dispatching system, similar to Django’s.

Tags: wsgi

Exciting developments with Django

2005-08-03T16:56:34+00:00

The amount of activity surrounding the Django web framework since its not-quite release a few weeks ago is amazing. Adrian, Jacob and Wilson have been working over-time, with 395 check-ins to source control since the 13th of July. They've added WSGI support, a development web server, unit-tests, a ton of documentation, SQLite support, database introspection and dozens of other feature tweaks and bug fixes. Check out the project Timeline for an idea of just how frenetic things have been.

The emerging Django community has been kicking in as well. There's a significant community-led initiative to get internationalisation and localisation going, and a wide number of unofficial tutorials have emerged to complement the one on the site.

Here's where things get really interesting: changes at the Journal-World have kick-started the Django job market. Rob Curley, formally in charge of the World Company's web activities, recently took up a new position at the Naples Daily News in Florida. Rob just hired Eric Moritz, a regular on the #django IRC channel, to work on Django-powered projects there.

Meanwhile, Adrian Holovaty has taken a new job at the Washington Post as "Editor, Editorial Innovations" - a role that is sure to involve some very innovative use of Django (Adrian built chicagocrime.org). Adrian's departure means that the Journal-World are looking for a new developer - here's why you should apply.

One thing's for certain: we're going to see some very exciting Django-powered sites in the next few months.

Tags: adrian-holovaty, django, sqlite, wsgi

Latest WSGI Draft

2004-08-26T00:13:28+00:00

Latest WSGI Draft

The Python Web-SIG are working on a PEP.

Tags: wsgi