I would like to update all packages in one package using threads in Python.
However, the code below doesn't get as fast as the Go routine or when multi-threaded with Python.Why is it getting late?
#!/usr/local/bin/python 3.4
import subprocess
importos
import threading
import re
default(package_name):
os.system("pipe 3.4 install" + package_name + "-U")
s=subprocess.check_output(["pip3.4", "freeze"]).decode()
package_list=re.findall(".+(?===)",s)
package_list.extend(["pip", "setuptools")
print(package_list)
for vin package_list:
threading.Thread(target=update, args=(v,)) .start()
python
This is not the answer, but if you run the following code for Python's GIL, for example,
from threading import thread
importos
def sleep(n):
os.system("date; echo"+str(n)+";sleep1")
for n in range (0, 10):
Thread(target=sleep, args=(n,)) .start()
The results are as follows:
Fri Mar 6 22:30:35 JST 2015
0
Fri Mar 6 22:30:35 JST 2015
1
Fri Mar 6 22:30:35 JST 2015
Fri Mar 6 22:30:35 JST 2015
3
4
Fri Mar 6 22:30:35 JST 2015
Fri Mar 6 22:30:35 JST 2015
5
2
Fri Mar 6 22:30:35 JST 2015
7
Fri Mar 6 22:30:35 JST 2015
8
Fri Mar 6 22:30:35 JST 2015
6
Fri Mar 6 22:30:35 JST 2015
9
Apparently, os.system() will remove the GIL.
It locks the buffer causes.system() releases the GIL when calling system().
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