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Ruby Garbage Collection Simon Hørup Eskildsen @Sirupsen
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Mark and Sweep (< 1.9) Lazy Sweeping (>= 1.9) Lazy Bitmask Sweeping (2.0) Geneartional GC (2.1?) Concurrent GC (??)
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Mark and Sweep
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RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE
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Root objects Freeable
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RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE
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RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE Free List
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RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE Free List
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RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE Free List
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RVALUE RCLASS RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE RVALUE Free List
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The Copy-on-Write Problem
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Process #2 Process #1
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Process #2 Process #1
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Process #2 Process #1 ? ? ? ? ? ? ?
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Process #2 Process #1
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Ruby 2.0
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0 0 1 0 0 1 1
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Process #2 Process #1 bar foo
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CoW problem fixed: => Less memory => Faster
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Geneartional GC Ruby 2.1?
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Root objects Freeable M&S Freeable
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Old Root objects Freeable Old M&S Freeable
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Prospects of a Concurrent GC