The PyPy status blog has a detailed description of the new incremental garbage collector adopted by this performance-oriented Python interpreter project. "The main issue is that splitting the major collections means that the main program is actually running between the pieces, and so it can change the pointers in the objects to point to other objects. This is not a problem for sweeping: dead objects will remain dead whatever the main program does. However, it is a problem for marking. Let us see why."

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