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Why can single-processor use of a python processor exceed 100 percent?

Due to the GIL, I thought that a multi-threaded python process can only have one thread running at a time, so CPU usage cannot exceed 100 percent.

But I found that the code below can take up 950% of the processor utilization at the top.

import threading
import time

def f():
    while 1:
        pass


for i in range(10):
    t = threading.Thread(target=f)
    t.setDaemon(True)
    t.start()

time.sleep(60)

This is not such a question as Python interpreters use up to 130% of my processor. How is this possible? . In this question, the OP said that he was doing intensive load testing of I / O , which could release the GIL. But in my program there is no I / O operation.

Tests run on CPython 2.6.6.

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def f():
    x=1
    while 1:
        y=x*2
0

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