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For the last few days I have been thinking a lot about GC as Terracotta moves towards our first major rewrite of that subsystem. Lots of relatively large changes have been bouncing around in my head as I read papers, blogs and talk to people. Maybe I'll blog about those later but one pretty simple one occurred to me. I have a theory that most Shared Objects are actually only directly referenced by one parent object (I haven't run stats on this yet so I might be full of it). I started from wondering whether we could take advantage of this to improve the efficiency of GC.