[web-devel] Performance of Yesod 0.7 fourteen times slower than Rails 2.3?

Michael Snoyman michael at snoyman.com
Mon Mar 21 11:40:59 CET 2011

Firstly, thank you for running this benchmark: it's the only way we
can find out where Yesod needs to be fixed.

I haven't had a chance to look into the code properly, but it looks
like this is more a test of the database backend than of the web
framework. I'll try to get to this myself later, but it would be very
interesting to see the difference in response times between PostgreSQL
and sqlite. Currently, persistent-sqlite binds directly to the sqlite
C API, while persistent-postgresql uses HDBC. It's entirely possible
that HDBC is adding some overhead.

One of the items on our wish list[1] is to migrate away from HDBC.
Having hard numbers like you are providing will help us figure out our
priorities a bit better.


[1] http://wiki.yesodweb.com/Wishlist

On Mon, Mar 21, 2011 at 12:10 PM, Sven Koschnicke (GFXpro)
<s.koschnicke at gfxpro.com> wrote:
> Hello,
> I'm coming from a Rails background and was very impressed by the features of
> the Yesod Web Framework. Working on an trading app in Rails I wanted to port
> some features of this app to a Yesod app just to learn the framework and
> because we have some performance issues with Rails.
> The first thing I noticed was that the Yesod app was significantly slower
> than the Rails app at trivial tasks. I am very astonished about that. I
> thought Rails should be slower because of its interpreted nature. I made
> some benchmarking and measured that a simple Rails app is fourteen times
> faster than a Yesod app that did the same thing (loading some records from
> the database and displaying them). Did I made a mistake or is my
> understanding, that the compiled app should be faster, just wrong?
> I documented the results on github:
> https://github.com/SKoschnicke/performance-test
> Greetings
>  Sven Koschnicke
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