definition not found: nogil-3.9.10-1

[xuanvuzzz2601]

I try "pyenv install nogil-3.9.10-1" but did not succeed.

[info]:
:: [Info] :: Mirror: https://www.python.org/ftp/python
pyenv-install: definition not found: nogil-3.9.10-1

See all available versions with pyenv install --list.
Does the list seem out of date? Update it using pyenv update.

[colesbury]

Hi @xuanvuzzz2601 - I don't think pyenv for Windows supports nogil (only pyenv for Linux and macOS). You can use the Windows installer from here: https://github.com/colesbury/nogil/releases (python-3.9.10-amd64.exe), but be warned that there are fewer support C-API extensions for nogil on Windows than for Linux or macOS.

[xuanvuzzz2601]

I have tested running the results of 2 programs with GIL and NOGIL but it doesn't seem to work on window. Please let me know what setup is needed for it to work.

[pjurgielewicz]

Hi @xuanvuzzz2601, what is your definition of working/not working? How do you invoke your script? I have run your example (with slight enhancements):

from threading import Thread
import time
import sys

print(sys.flags)

COUNT = 50000000

def countdown(n):
    while n>0:
        n -= 1

# 1st pass
start = time.time()
countdown(COUNT)
end = time.time()
print('Time taken in seconds -', end - start)

# 2nd pass
t1 = Thread(target=countdown, args=(COUNT//2,))
t2 = Thread(target=countdown, args=(COUNT//2,))

start = time.time()
t1.start()
t2.start()

t1.join()
t2.join()

end = time.time()
print('Time taken in seconds -', end - start)

And I got the following result running py -3.9 .\test.py (I do not have regular CPython 3.9 installed on my Windows machine)

sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0, dev_mode=False, nogil=True)
Time taken in seconds - 2.3499691486358643
Time taken in seconds - 1.1804711818695068

Please note that the nogil flag is set to True, indicating that nogil is being used. Please check and compare it on your system.