# colesbury/nogil

Multithreaded Python without the GIL

Repository: https://github.com/colesbury/nogil
Canonical: https://ross.abutalabs.com/products/nogil
Language: Python
License: NOASSERTION
License Family: other
Archived: true
Last push: 2025-05-20T19:07:32+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 22, release rhythm 8, longevity 100
- inputs: {"age_days": 1792, "days_push": 470, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2911, forks 102 (observed 2026-08-28T04:07:29.230546+00:00)

## What it is
A proof-of-concept fork of CPython that removes the global interpreter lock (GIL) to enable true multithreaded Python execution. Development has ended in favor of the official free-threaded builds of Python 3.13+ (PEP 703).

## Use cases
- run python threads in parallel without the gil
- test cpu-bound multithreaded python code
- benchmark gil-free cpython performance
- research the design of a gil-less python interpreter

## When to choose
- you need to study the original no-GIL design that informed PEP 703
- you are on legacy Python versions and want to experiment with GIL removal

## When to avoid
- you want production GIL-free Python - use the free-threaded build of Python 3.13+
- you need an actively maintained interpreter
- you need guaranteed stability or official support

## Facets
- artifact type: library
- maturity: abandoned
- function: concurrency, interpreter, programming-language
- domain: programming-languages, developer-tools, performance
- platform: python, windows
- tags: gil, free-threading, cpython-fork, multithreading, proof-of-concept, linux, macos

## Member repositories
- colesbury/nogil (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:29.230546+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:34:15.524593+00:00, confidence not recorded.
  - readme: https://github.com/colesbury/nogil (fetched 2026-08-28T04:07:29.230546+00:00, sha 203bc1fda33c)
- Data as of 2026-08-30T08:39:29.467469+00:00.