Sintra memory usage - Part 1

Sintra Log (subclass) on 3 curl requests

∴ ruby subclass.rb
== Sinatra/1.4.2 has taken the stage on 4567 for development with backup from Thin
>> Thin web server (v1.5.1 codename Straight Razor)
>> Maximum connections set to 1024
>> Listening on localhost:4567, CTRL+C to stop
---- Init myApp
-- Setting up array id 70252864198560
-- Starting GC
 ---- Waiting in memory (1848): #<MyApp:0x007fca08831ad8 @default_layout=:layout, @app=nil, @template_cache=#<Tilt::Cache:0x007fca08830f20 @cache={}>>
 ---- Waiting in memory (3576): #<MyApp:0x007fca0a0710a8 @default_layout=:layout, @app=nil, @template_cache=#<Tilt::Cache:0x007fca08830f20 @cache={}>, @env={"SERVER_SOFTWARE"=>"thin
-- Setting up array id 70252860706040
-- Starting GC
 ---- Waiting in memory (1848): #<MyApp:0x007fca08831ad8 @default_layout=:layout, @app=nil, @template_cache=#<Tilt::Cache:0x007fca08830f20 @cache={}>>
 ---- Waiting in memory (3576): #<MyApp:0x007fca099c92f0 @default_layout=:layout, @app=nil, @template_cache=#<Tilt::Cache:0x007fca08830f20 @cache={}>, @env={"SERVER_SOFTWARE"=>"thin
 ---- Waiting in memory (3576): #<MyApp:0x007fca0a0710a8 @default_layout=:layout, @app=nil, @template_cache=#<Tilt::Cache:0x007fca08830f20 @cache={}>, @env={"SERVER_SOFTWARE"=>"thin
-- Setting up array id 70252868641540
-- Starting GC
 ---- Waiting in memory (1848): #<MyApp:0x007fca08831ad8 @default_layout=:layout, @app=nil, @template_cache=#<Tilt::Cache:0x007fca08830f20 @cache={}>>
 ---- Waiting in memory (3576): #<MyApp:0x007fca099c92f0 @default_layout=:layout, @app=nil, @template_cache=#<Tilt::Cache:0x007fca08830f20 @cache={}>, @env={"SERVER_SOFTWARE"=>"thin
 ---- Waiting in memory (3576): #<MyApp:0x007fca0a0710a8 @default_layout=:layout, @app=nil, @template_cache=#<Tilt::Cache:0x007fca08830f20 @cache={}>, @env={"SERVER_SOFTWARE"=>"thin
 ---- Waiting in memory (3576): #<MyApp:0x007fca0a8f55a8 @default_layout=:layout, @app=nil, @template_cache=#<Tilt::Cache:0x007fca08830f20 @cache={}>, @env={"SERVER_SOFTWARE"=>"thin
^C>> Stopping ...

== Sinatra has ended his set (crowd applauds)
****** GC Array(70252868641540) Starting
****** GC Array(70252860706040) Starting
****** GC Array(70252864198560) Starting

subclass.rb

require 'sinatra/base'
require 'objspace'

# ruby-head only, Sorry.

class MyApp < Sinatra::Base

  def initialize(*args)
    puts "---- Init myApp"
    super(*args)
  end

  get '/' do
    array = []
    10000.times do
      array << Object.new
    end

    puts "-- Setting up array id #{array.object_id}"
    ObjectSpace.define_finalizer(array, proc {|id| puts "****** GC Array(#{id}) Starting" })

    array.size.to_s
  end

  after do
    puts "-- Starting GC"
    ObjectSpace.each_object(MyApp) do |obj|
      sz = ObjectSpace.reachable_objects_from(obj).map{|o| ObjectSpace.memsize_of(o) }.inject{|sum, x| sum + x }
      puts " ---- Waiting in memory (#{sz}): #{obj.inspect.to_s.slice(0,150)}"
    end
    GC.start
  end

end

MyApp.run!

The proc in the finalizer has a reference to the app instance, thus it's never released.

See http://www.mikeperham.com/2010/02/24/the-trouble-with-ruby-finalizers/

Ah, tricky. I'll try and use the class method approach on my live app and see where it leads me.