Deferred Garbage Collection for Specs

Deferred_garbage_collection.rb

class DeferredGarbageCollection
  NEW_GC_THRESHOLD = (ENV["DEFER_GC"] || -1).to_f

  @last_gc_run = Time.zone.now

  def self.start
    GC.disable if NEW_GC_THRESHOLD > 0
  end

  def self.reconsider
    if NEW_GC_THRESHOLD > 0 && Time.zone.now - @last_gc_run >= NEW_GC_THRESHOLD
      GC.enable
      GC.start
      GC.disable
      @last_gc_run = Time.zone.now
    end
  end
end

if defined?(Cucumber)
  Before do
    DeferredGarbageCollection.start
  end

  After do
    DeferredGarbageCollection.reconsider
  end
elsif defined?(RSpec)
  RSpec.configure do |config|
    config.before(:all) do
      DeferredGarbageCollection.start
    end

    config.after(:all) do
      DeferredGarbageCollection.reconsider
    end
  end
end