[web-devel] gitit performance: happstack vs yesod
jgm at berkeley.edu
Sat Jul 7 18:42:36 CEST 2012
The problem (an extra call to filestore's 'latest' in 'getRawContents') is
fixed with the latest github code. With the fix, gitit2 (yesod) comes
out slightly faster than gitit (happstack) -- by about a 7/6 ratio in
one test. That's what I had expected originally.
+++ John MacFarlane [Jul 07 12 09:27 ]:
> Never mind -- I've traced the slowness to a difference unrelated
> to happstack and Yesod. Once I get this sorted out, I'll post here about
> the new benchmarks.
> +++ John MacFarlane [Jul 06 12 19:50 ]:
> > I've been working on a port of gitit to Yesod, which is currently called
> > gitit2 (https://github.com/jgm/gitit2). At this point I have implemented
> > most of the basic wiki functionality.
> > I've really been enjoying some of Yesod's features -- especially the
> > type-safe URLs, form support, internationalization, and widgets -- and
> > the code is much cleaner and shorter than the original gitit code.
> > But today I thought I'd look at performance, and I was surprised to
> > find that gitit2 is considerably slower than the original gitit (built
> > on happstack). For example, on one simple test page, siege recorded 9
> > transactions per second for gitit2, 18 for the original gitit. (This is
> > with caching turned off, so each hit involves getting content from the
> > git repository, parsing it, and creating an HTML wiki page. Of course
> > most of that work is done by filestore and pandoc, which are used
> > by both gitit and gitit2.)
> > I'm really curious why gitit2 is so much slower, and I wonder whether
> > I'm making some basic mistake. At this point most of the code is in one
> > module, https://github.com/jgm/gitit2/blob/master/Network/Gitit2.hs .
> > This defines a Yesod subsite which is wrapped by a Yesod site in the
> > main executable, https://github.com/jgm/gitit2/blob/master/src/gitit2.hs
> > . The benchmark I did just involved fetching the front page, so most
> > of the handlers are irrelevant. If anyone has any useful ideas, I'd be
> > grateful.
> > John
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