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I am a newbie Python programmer. I interested in parallel and concurrent programming. I understand the difference between process and thread but I confused about how multiprocessing and threading work. If my program A is - 

from multiprocessing import Process for i in range(50): p = Process(target=worker) p.start()

Does it will generate 50 processes on 1 CPU or distribute on 4 CPUs (my laptop has 4 CPUs 2 Cores) and same question but change program A to program B my program B is -

from threading import Thread for i in range(50) t = Thread(target=worker) t.start()

In program B all threads depend on 1 process or not?

Explain this to me, please. Thank you.

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Multiprocessing creates new subprocess, which can be run on multiple cores simultaneously.

Threading, as its name, will create a thread. Multiple threads share the same memory space, and GIL (Global Interpreter Lock) will prevent them to concurrent write. Due to GIL, threads cannot be spawned on multiple cores.

So, A will run on 4 CPUs, while B will run on one.

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