GC trick, reduce gc frequency by time factor, create hiccups in response time

gc_middleware.rb

class GCMiddleware
  def initialize(app, options={})
    @app = app
    @options = options
  end

  def call(env)
    begin_gc_deferment
    result = @app.call(env)
    reconsider_gc_deferment(env)

    result
  end

  DEFERRED_GC_THRESHOLD = 5.0

  @@last_gc_run = Time.now

  private

  def begin_gc_deferment
    GC.disable if DEFERRED_GC_THRESHOLD > 0
  end

  def reconsider_gc_deferment(env)
    if DEFERRED_GC_THRESHOLD > 0 && Time.now - @@last_gc_run >= DEFERRED_GC_THRESHOLD
      request = Rack::Request.new(env)

      GC.enable
      GC::Profiler.enable
      GC.start

      puts request.path
      puts GC::Profiler.result
      GC::Profiler.disable
      GC::Profiler.clear
      GC.disable

      @@last_gc_run = Time.now
    end
  end

end

use GCMiddleware