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GeezerVison is showing github.com — Mark all objects reachable from roots as live before doing main cyclic GC pass · Issue #126491 · python/cpython Open Labels interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)performancePerformance or resource usagePerformance or resource usagetype-featureA feature request or enhancementA feature request or enhancement DescriptionObjects can only be cyclic garbage if they are not reachable. Performing a transitive closure of all objects reachable from global roots (the sys and builtins modules as well as builtin class's dicts and sublasses) plus a transitive closure of all objects reachable from the stacks can eliminate >90% of all objects relatively cheaply. Initial experiments show a ~3% speedup, with an almost 50% speedup of the most gc-heavy benchmark. This idea has been proposed a few times. What makes this more feasible now is that the GC can see the evaluation stack of frames, thanks to #124392, so we would now expect that the vast majority of reachable objects can be cheaply marked, thus improving the efficiency of cycle detection considerably. Linked PRs
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