inter-thread (2022-12-29) : a nogil WinPython.

Experimenting "nogil" performance on Windows.

Nogil is the extraordinar experimental fork of standard cpython that removes "GIL" limitation.

Promise in theory (on linux), multi-thread "pure python with no I/O" programs:

• instead of scaling per ZERO by using threads, your program speeds-up per the number of threads (up to your number of "real" cpus),
• there is nearly no mono-thread penalty (below 10%).

On a personal test on a old intel cpu 2cpu/4threads Windows 10, with nogil python of 2022-12-22:

• running in "notebooks\docs" the sudoku_thread_perf_comparison.py program gives
  • on Python-3.9.10 nogil of 2022-12-22:
    
  • on a normal python-3.9.10:
    

So on Windows, with nogil python of 2022-12-22:

• nogil scales as for linux exactly to the number of cpu (2 normal + 2 hyperthread means in general 2.2 cpus)
• but the current mono-thread penalty is about 50% versus standard Python, on Windows.

WinPython 3.9.10.1dotnogil

The following packages are included in WinPython-64bit v3.9.10.1dotnogil _a1.