Erubi Support

[adam12]

I think it would be worth considering support for Erubi, either in addition or in replacement of Erubis. I won't go into the benefits of Erubi - Jeremy Evans does a great job in the README.

I ran some benchmarks using my code here: https://gist.github.com/adam12/8c3613d0c9ba6ebddc8eb8a962b36323

In summary:

• Erubis vs Erubi performance fairly comparable.
• Memory usage of Erubi is indeed 90% lower (per claim in Erubi README).
• Jeremy is known to be an excellent OSS maintainer.

(the following tests run with ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15])

Performance Benchmark

Comparison:
1k fast erubis    (eval):        3.4 i/s
1k erubis         (eval):        3.2 i/s - 1.04x  slower
1k erb            (eval):        3.1 i/s - 1.08x  slower
1k erubi          (eval):        2.7 i/s - 1.22x  slower
1k erubi  (compile+eval):        2.1 i/s - 1.58x  slower
1k erubis (compile+eval):        2.1 i/s - 1.61x  slower
1k erb    (compile+eval):        1.9 i/s - 1.76x  slower

Memory Benchmark

Some data removed for brevity

allocated memory by gem
-----------------------------------
    102227  erubis-2.7.0
     15992  erubi-1.0.0

allocated objects by gem
-----------------------------------
       908  erubis-2.7.0
       181  erubi-1.0.0

retained memory by gem
-----------------------------------
     50999  erubis-2.7.0
      2528  erubi-1.0.0

retained objects by gem
-----------------------------------
       154  erubis-2.7.0
         8  erubi-1.0.0

I'd be willing to submit a PR should this be of interest.

[ujifgc]

Yes, you are welcome to submit a PR.

[wikimatze]

@adam12 do you want to implement the support for this?

[adam12]

@wikimatze I'm going to explore adding it, yes.

[wikimatze]

Perfect, looking forward to your contribution.

[fidalgo]

Actually Rails is moving to Erubi also: rails/rails#27757

[ujifgc]

Implemented in #2090