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Python 3.13 no-GIL ships mimalloc as default — +14% on Redis vs jemalloc
jemalloc has been the default allocator in production servers since 2014. Most C and C++ services you've ever touched malloc through it. CPython 3.13's free-threaded build just replaced it with mimalloc as the default allocator. The mechanism is free-list sharding. A classic allocator keeps one global free list per size class — every malloc ...
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