Add lucen (Concurrency and Parallelism)#3264
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Project
lucen
Checklist
Add lucen- [lucen](url) - Description ending with period.Why This Project Is Awesome
Which criterion does it meet? (pick one)
Explain:
lucen parallelizes existing CPU-bound Python
for-loops without a rewrite: you mark a loop with two comments and run it. It does this under a guarantee that is rare in this space, that the parallel run is bit-identical to plain sequential Python, floats and container insertion order included. It only parallelizes loops it can prove are both safe and worthwhile, and otherwise runs them sequentially and reports why. The quality bar is unusually high: it is verified with differential and property testing, whole-program fuzzing, and TLA+ formal specifications for the privatize-and-commit protocol; it ships an optional Rust (PyO3/abi3) core with a guaranteed-identical pure-Python fallback; and it fully supports free-threaded (no-GIL) CPython 3.13/3.14, routing to real threads there.How It Differs
Unlike
multiprocessing/concurrent.futures/joblib(which require restructuring into pools, chunking, and pickling) or Numba (which JIT-compiles numeric bodies), lucen leaves your loop exactly as written and adds a hard correctness guarantee, bit-identical to sequential, enforced by construction and checked formally. It also routes by interpreter: processes on GIL builds, real threads on free-threaded builds. No other parallelizer in the list pairs "no code rewrite" with "provably identical results."