gh-134939: Add a Multiple Interpreters Howto Doc by ericsnowcurrently · Pull Request #136143 · python/cpython

ericsnowcurrently

Some users might need a (foot)note that subinterpreters can sometimes improve the startup by importing nothing.

example

def non_stateless():
    non_stateless

if __name__ == '__main__':
    import threading
    from concurrent import interpreters
    interps = [interpreters.create() for i in range(10)]
    threads = [
        threading.Thread(target=interp.call, args=(non_stateless,))
        for interp in interps
    ]
    for thread in threads:
        thread.start()
    for thread in threads:
        thread.join()

That seems not so beneficial for the InterpreterPoolExecutor case, though.