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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Remove lazy dictionary tracking","articleBody":"# Feature or enhancement\n\n### Proposal:\n\nIn order to reduce the overhead of cycle GC detection for objects that cannot be part of cycles, we lazily untrack tuples and dictionary that only refer to objects that cannot be part of a cycle.\n\nThis is fine for tuples, but dictionaries are mutable, so we need to check every time a dictionary is modified whether it needs to be tracked.\n\nSince most objects no longer have a `__dict__` dictionary, the complexity and overhead of this lazy tracking is not worth the small benefit in the cycle GC.\n\n\nThis was originally implemented in https://github.com/python/cpython/pull/126502, but is largely orthogonal to the main purpose of that PR, so should be implemented separately.\n\n\n### Has this already been discussed elsewhere?\n\nThis is a minor feature, which does not need previous discussion elsewhere\n\n### Links to previous discussion of this feature:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-127027\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/markshannon","@type":"Person","name":"markshannon"},"datePublished":"2024-11-19T12:21:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/127010/cpython/issues/127010"}