python os.fork是否使用相同的python解释器? [英] Does python os.fork uses the same python interpreter?

问题描述

我了解Python中的线程使用相同的Python解释器实例.我的问题与os.fork创建的进程是否相同?还是os.fork创建的每个进程都有自己的解释器?

I understand that threads in Python use the same instance of Python interpreter. My question is it the same with process created by os.fork? Or does each process created by os.fork has its own interpreter?

推荐答案

每当您进行分叉时，整个Python进程都会在内存中重复(包括 Python解释器，您的代码和任何库，当前堆栈等)来创建第二个进程-派生一个进程比创建一个线程要昂贵得多的原因之一.

Whenever you fork, the entire Python process is duplicated in memory (including the Python interpreter, your code and any libraries, current stack etc.) to create a second process - one reason why forking a process is much more expensive than creating a thread.

这将创建python解释器的新副本.

This creates a new copy of the python interpreter.

运行两个python解释器的一个优点是您现在拥有两个GIL(全局解释器锁)，因此可以在多核系统上进行真正的多处理.

One advantage of having two python interpreters running is that you now have two GIL's (Global Interpreter Locks), and therefore can have true multi-processing on a multi-core system.

一个进程中的线程共享相同的GIL，这意味着在给定的时刻只有一个线程在运行，这只给人以并行的错觉.

Threads in one process share the same GIL, meaning only one runs at a given moment, giving only the illusion of parallelism.

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