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Example Article To Read When inspect.getmodule() computes its filename cache key, getabsfile() consults getsourcefile(), which recurses into getmodule() — scanning sys.modules a second time on every cache miss. Cache hits also pay getsourcefile()'s linecache probe and os.path.exists() call. This PR passes the filename explicitly, so the key is computed without the recursion. Instagram Stalker

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Workload	main	PR	Speedup
Cached filename hit	4.13 µs	0.85 µs	4.9x
Unregistered frame (repeated miss)	3.19 ms	1.55 ms	2.1x
Bare code object (repeated miss)	3.06 ms	1.53 ms	2.0x
Miss after a registry mutation	3.14 ms	1.67 ms	1.9x
Function fast path	0.168 µs	0.168 µs	no change

Benchmark script

import inspect import sys import timeit import types for i in range(10_000): m = types.ModuleType(f"fake_{i}") m.__file__ = f"/tmp/fake/mod_{i}.py" sys.modules[m.__name__] = m real_file = sys.modules["fake_1"].__file__ code_hit = compile("pass", real_file, "exec") code_miss = compile("pass", "<generated>", "exec") ns = {"sys": sys, "out": {}} exec(compile("out['frame'] = sys._getframe()", "<generated>", "exec"), ns) frame = ns["out"]["frame"] def a_function(): pass inspect.getmodule(code_hit) # warm the cache for label, fn in [ ("cached filename hit", lambda: inspect.getmodule(code_hit)), ("unregistered frame (miss)", lambda: inspect.getmodule(frame)), ("bare code object (miss)", lambda: inspect.getmodule(code_miss)), ("function fast path", lambda: inspect.getmodule(a_function)), ]: number, elapsed = timeit.Timer(fn).autorange() print(f"{label:28s} {elapsed / number * 1e6:10.3f} us")

• Issue: Slow inspect.getmoduleHow To Read Psychology Journal Articles Effectively