cucumber_hooks.rb

Before do |scenario|
  DeferredGarbageCollection.start
end

After do |scenario|
  DeferredGarbageCollection.reconsider
end

at_exit do
  DeferredGarbageCollection.stop
end

deferred_garbage_collection.rb

class DeferredGarbageCollection

  DEFERRED_GC_THRESHOLD = (ENV['DEFER_GC'] || 10.0).to_f

  @@last_gc_run = Time.now

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

  def self.stop
    GC.enable
    GC.start
  end

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

end

spec_helper.rb

RSpec.configure do |config|

  config.after(:suite) do
    DeferredGarbageCollection.stop
  end
  
  config.before(:all) do
    DeferredGarbageCollection.start
  end

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