STINNER Victor <vstin...@redhat.com> added the comment:
PR 9541: my new attempt to remove the micro-optimization. Commit message:
bpo-30156: Remove property_descr_get() optimization
property_descr_get() uses a "cached" tuple to optimize function
calls. But this tuple can be discovered in debug mode with
sys.getobjects(). Remove the optimization, it's not really worth it
and it causes 3 different crashes last years.
Microbenchmark:
./python -m perf timeit -v \
-s "from collections import namedtuple; P = namedtuple('P', 'x y'); p =
P(1, 2)" \
--duplicate 1024 "p.x"
Result:
Mean +- std dev: [ref] 32.8 ns +- 0.8 ns -> [patch] 40.4 ns +- 1.3 ns: 1.23x
slower (+23%)
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<https://bugs.python.org/issue30156>
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