tdciwasaki/python-nogil repository overview

docker pull tdciwasaki/python-nogil:latest
docker run -it tdciwasaki/python-nogil:latest python

docker run --rm tdciwasaki/python-nogil:latest python -c "
import sys
print(f'Python {sys.version}')
print(f'GIL disabled: {not sys.flags.gil}')
"

Python 3.14.0 (main, Oct 10 2025, 00:00:00) [GCC 12.2.0]
GIL disabled: True

FROM tdciwasaki/python-nogil:3.14

WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .
CMD ["python", "app.py"]

import threading
import time

def worker(n):
    """CPU-intensive task (benefits from GIL disabling)"""
    total = 0
    for i in range(10_000_000):
        total += i * n
    return total

threads = []
for i in range(4):
    t = threading.Thread(target=worker, args=(i,))
    threads.append(t)
    t.start()

for t in threads:
    t.join()

print("✓ All threads completed")

# Run with GIL disabled
python app.py
# Run with GIL enabled
PYTHON_GIL=1 python app.py