[Ironruby-core] Performance issues with json_pure under IronRuby

Shay Friedman shay.friedman at gmail.com
Fri Jul 30 15:37:12 EDT 2010


I've narrowed the problem down. It's somewhere in the StringScanner.Match
method (probably inside RubyRegex.Match).

The next IR code (I've put in on pastebin) results with the same performance
problem where MRI is about 100 (!) times faster than IronRuby:
http://pastebin.com/cc9FvUfz.

Shay.


On Fri, Jul 30, 2010 at 2:03 PM, Daniele Alessandri <suppakilla at gmail.com>wrote:

> Hi,
> yesterday I was testing the json library under IronRuby and,
> comparisons with other implementations aside, I noticed that the
> "pure" variant performs so bad under IronRuby that it just doesn't
> feel normal at all. This is the result for my test with a ~500KB JSON
> file parsed under IronRuby 1.1.0 (.NET 4):
>
> C:\IronRuby\v1.1.0>ir json_speed.rb pure
> Rehearsal ------------------------------------
>  474.906250  39.421875 514.328125 (394.262696)
> ------------------------- total: 514.328125sec
>
>       user     system      total        real
>  482.531250  43.140625 525.671875 (384.509766)
>
> Here is the full gist with also the results for the same test run
> using other implementations (JRuby 1.5 and the latest MRI 1.8.6):
> http://gist.github.com/498997
>
> I haven't figured yet where the bottleneck is, and the fact that it's
> slower on the second run makes things even weirder since the cold
> execution overhead shouldn't be there anymore. Any idea about why is
> it so slow?
>
> --
> Daniele Alessandri
> http://clorophilla.net/
> http://twitter.com/JoL1hAHN
> _______________________________________________
> Ironruby-core mailing list
> Ironruby-core at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ironruby-core
>
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