Grabage Collector in ruby, Why should I care ?

Ruby GC talk for Deccan ruby conf

Transcript

1. कचरा गोळा करणारा मी काळजी का क े ली पा हजे 1
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13. a = [ {c: 'd'} ] ... a = nil 11
17. a = [ {c: 'd'} ] 15
21. module GC def self.run mark sweep end def self.mark root_objects.each do |root_obj| root_obj.associated_objects.each do |object| obj.update(marked: true) end end end def self.sweep objects.where(marked: false).destroy_all objects.update_all(marked: false) end end 19
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30. module GC def self.run objects.update_all(color: white) clearly_living_objects.update_all(color: grey) objects.where(color: grey).each do |object| object.references.update_all(color: grey) object.update(color: black) end objects.where(color: white).destroy_all end end 27
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38. 100_000.times do foo = "a string" end RETAINED = [] 100_000.times do RETAINED << "a string" end 34
39. Model.all.each do |item| process(item) end Model.find_each do |item| process(item) end Model.select(:id,:other, :necessary, :attributes) 35 . 1
40. class Thing; end list = Array.new(1000) { Thing.new } list.each do |item| puts item end list = nil class Thing; end list = Array.new(1000) { Thing.new } while list.count > 0 puts list.pop end 35 . 2