Scrym: Self-collecting Ruby Mutators

A explicit Ruby's memory management system on programmer-controlled time without malloc/free way.

Usually Ruby's garbage collector manages all object on the heap. However, if you use Scrym::Mutator.mark(obj), GC doesn't care obj at all time. Instead, we explicitly collect those on a mutator at one's own risk.

require "scrym"
include Scrym

a = "a"
10_000.times do |i|
  a = a.succ
  Mutator.mark(a)
  Mutator.collect if (i % 10).zero?
end
p a #=> "ntq"

Scrym collector's targets are only marked objects by Scrym.

% time ruby benchmark/bm_app_mandelbrot.rb
GC.count = 1785 : total time 0.7400470000000003(sec)
2.14s user 0.04s system 99% cpu 2.185 total

% time ruby benchmark/bm_app_mandelbrot_with_scrym.rb
GC.count = 1092 : total time 0.40402999999999956(sec)
1.92s user 0.04s system 99% cpu 1.963 total

Add this line to your application's Gemfile:

gem 'scrym'

And then execute:

$ bundle

Or install it yourself as:

$ gem install scrym

• Ruby 1.9.3 or later

• Finalizer (All programmers should not use any finalizer)

This product's idea is based on Self-collecting Mutators. Thanks a lot!

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Added some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request