[Ironruby-core] Performance issues with json_pure under IronRuby

Shay Friedman shay.friedman at gmail.com
Fri Jul 30 16:41:03 EDT 2010


Done - http://ironruby.codeplex.com/workitem/4966

Shay.

On Fri, Jul 30, 2010 at 11:17 PM, Tomas Matousek <
Tomas.Matousek at microsoft.com> wrote:

>  Great work. Could you file a bug so that we track this perf issue?
>
>
>
> Tomas
>
>
>
> *From:* ironruby-core-bounces at rubyforge.org [mailto:
> ironruby-core-bounces at rubyforge.org] *On Behalf Of *Shay Friedman
> *Sent:* Friday, July 30, 2010 12:37 PM
> *To:* ironruby-core at rubyforge.org
> *Subject:* Re: [Ironruby-core] Performance issues with json_pure under
> IronRuby
>
>
>
> 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
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>
>
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