Show HN: Warp_cache – SIEVE cache in Rust for Python, 25x faster than cachetools

**Show HN: Warp_cache – SIEVE cache in Rust for Python, 25x faster than cachetools**

I built warp_cache, a thread-safe Python caching decorator backed by a Rust extension (PyO3). It's designed as a drop-in replacement for functools.lru_cache.The main ideas:- SIEVE eviction (NSDI'24) instead of LRU — scan-resistant, up to 21.6% fewer cache misses on real workloads - The entire cache lookup happens in a single Rust __call__ — no Python wrapper overhead - Thread-safe out of the box: GilCell under the GIL, sharded RwLock under free-threaded Python (3.13+) - Cross-process shared memory backend via mmap (9.7M ops/s across processes) - 16–23M ops/s single-threaded, 25x faster than cachetools, 1.6x faster than lru_cache + Lock under multi-threaded loadMigration from lru_cache is one line: -from functools import lru_cache +from warp_cache import cache -@lru_cache(maxsize=128) +@cache(max_size=128) Benchmarks and eviction quality comparisons are in the repo. Comments URL: https://news.ycombinator.com/item?id=47301973 Points: 1 # Comments: 0

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