我对多处理星图的理解是否正确？

Question

我写了一个小程序来检查一堆哈希，我想知道这是否是 starmap 的正确应用，是否应该进行其他处理。我目前的理解是starmap应该在worker之间分工，但是好像并没有做到。

from multiprocessing import Pool
from hashlib import sha256
import datetime


start = datetime.datetime.now()

def hash(text):
    return sha256(text.encode("utf-8")).hexdigest()

string = "Baguette "

def f(r, z, string):
    for i in range(r, z):
        j = hash(string + str(i))
        if j.startswith("000000"):
            print(i, j[0:6])

if __name__ == '__main__':
    with Pool(8) as p:
        p.starmap(f, [[0, 10000000, string]])
        p.starmap(f, [[20000000, 30000000, string]])
        p.starmap(f, [[30000000, 40000000, string]])
        p.starmap(f, [[40000000, 50000000, string]])
    print(datetime.datetime.now()-start)

Python apparently has 9 processes open, but only one is using the CPU (11.9%)

Answer 1

from multiprocessing import Pool
from hashlib import sha256
import datetime


start = datetime.datetime.now()

def hash(text):
    return sha256(text.encode("utf-8")).hexdigest()

string = "Baguette "

def f(r, z, string):
    for i in range(r, z):
        j = hash(string + str(i))
        if j.startswith("000000"):
            print(i, j[0:6])

if __name__ == '__main__':
    with Pool(8) as p:
        p.starmap(f, [[0, 10000000, string], [20000000, 30000000, string], [30000000, 40000000, string], [40000000, 50000000, string]])
    print(datetime.datetime.now()-start)

谢谢@flakes 的好回答:)

flakes 的评论：

我对多处理星图的理解是否正确？

Is my understanding of multiprocessing's starmap correct?

python

python-multiprocessing

sha256

starmap