[Twisted-web] A twisted wsgi success

[Gelin Yan]

On Thu, May 21, 2015 at 1:56 AM, Ian Schenck <ian.schenck at gmail.com> wrote:

> I mostly lurk on here, but I wanted to share my recent experience
> switching my company's wsgi container to twisted wsgi.
>
> We had been using a particular wsgi container implemented in C. As time
> went on problems creeped up with cython modules, segfaults happened, and
> threading had to be disabled. Things that worked in development would not
> work in production. At this point I wanted two things: the development
> container should be the production container, and the container of choice
> should provide a python interpreter environment consistent with actual
> python. These containers written in C which treat your application like a
> plugin fail to do that across the board.
>
> We no longer have any of the issues we had before (cython, threading,
> segfaults), and if something were to break in production, it is probably
> broken in development and won't make it out the door. Development servers
> run the same twisted wsgi container that runs in production, in fact they
> are both launched the same (but middlewares and reloaders differ). That
> consistency is a really big deal. Additionally, deployment and config
> management dropped a few hundred lines.
>
> The biggest pushback I received was over performance. We benched our real
> world application (versus, ahem, just returning a string) and found our
> median response time was consistently 1-2ms higher across various
> concurrency levels. That's insignificant for us. Under high load, twisted
> wsgi actually did better with tail latency (99%ile and max). Maybe that
> slight bump in median latency is because our web workers now speak http
> instead of a "light weight protocol" akin to scgi, but the benefits of
> talking http (curl much?) are also worth a millisecond or two.
>
> Thanks for all the hard work, and thanks Glyph for your 2011 Djangocon
> talk and your tweets leading me to twisted wsgi. We're very happy. If
> anyone wants details or a peek at some of the wiring, I can probably get
> approval to share more.
>
>
Hi Ian

    Could you tell me a bit your benchmark data? I am interested in moving
our container to twisted recently.

Regards

gelin yan
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