Python Multiprocessing Kill Processes
Solution 1
You need to .join()
on your processes in a worker Queue, which will lock them to the calling application until all of them succeed or kill when the parent is killed, and run them in daemon mode.
http://forums.xkcd.com/viewtopic.php?f=11&t=94726
end daemon processes with multiprocessing module
http://docs.python.org/2/library/multiprocessing.html#the-process-class
http://www.python.org/dev/peps/pep-3143/#correct-daemon-behaviour
Solution 2
The answer pointed by Blake VandeMerwe is listed and explained below hope could be helpful for other users:
kill -9 `ps -ef | grep test.py | grep -v grep | awk '{print $2}'`
Explaination:
"ps -ef": show all the processes including those without controlling terminals, which are exactly the countless processes generated by MULTIPROCESSING library.
"grep test.py": find all the processes which are generated by this script, which is the name of my python script.
"grep -v grep": excluded the grep operation itself from the 'killing list'
"awk '{print $2}'": using AWK to separate every single records into row and print out the second row which in this case, are the process id colum.
"kill -9" is force kill process, arguments should be UID. The complete output of previous steps are put together by "`", which is the character on the left of number 1 on regular keyboard. which treat them as a variable and pass the value to kill.
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B.Mr.W.
SOreadytohelp I am a business data analyst who use R and Python. Started recently learning Apache Spark. I am a firm believer of open source software.
Updated on October 22, 2022Comments
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B.Mr.W. over 1 year
I am learning how to use the Python multiprocessing library. However, while I am going through some of the examples, I ended up with many python processes running in my background.
One of the example looks like below:
from multiprocessing import Process, Lock def f(l, i): l.acquire() print 'hello world', i l.release() if __name__ == '__main__': lock = Lock() for num in range(10): # I changed the number of iterations from 10 to 1000... Process(target=f, args=(lock, num)).start()
Now here is a screen shot of my 'TOP' command:
88950 Python 0.0 00:00.00 1 0 9 91 1584K 5856K 2320K 1720K 2383M 82441 1 sleeping 1755113321 799 88949 Python 0.0 00:00.00 1 0 9 91 1584K 5856K 2320K 1720K 2383M 82441 1 sleeping 1755113321 798 88948 Python 0.0 00:00.00 1 0 9 91 1580K 5856K 2316K 1716K 2383M 82441 1 sleeping 1755113321 797 88947 Python 0.0 00:00.00 1 0 9 91 1580K 5856K 2316K 1716K 2383M 82441 1 sleeping 1755113321 796 88946 Python 0.0 00:00.00 1 0 9 91 1576K 5856K 2312K 1712K 2383M 82441 1 sleeping 1755113321 795 88945 Python 0.0 00:00.00 1 0 9 91 1576K 5856K 2312K 1712K 2383M 82441 1 sleeping 1755113321 794 88944 Python 0.0 00:00.00 1 0 9 91 1576K 5856K 2312K 1712K 2383M 82441 1 sleeping 1755113321 794 88943 Python 0.0 00:00.00 1 0 9 91 1572K 5856K 2308K 1708K 2383M 82441 1 sleeping 1755113321 792 88942 Python 0.0 00:00.00 1 0 9 91 1568K 5856K 2304K 1708K 2383M 82441 1 sleeping 1755113321 790 88941 Python 0.0 00:00.00 1 0 9 91 1564K 5856K 2300K 1704K 2383M 82441 1 sleeping 1755113321 789 88938 Python 0.0 00:00.00 1 0 9 91 1564K 5856K 2300K 1704K 2383M 82441 1 sleeping 1755113321 788 88936 Python 0.0 00:00.00 1 0 9 91 1576K 5856K 2296K 1716K 2383M 82441 1 sleeping 1755113321 787 88935 Python 0.0 00:00.00 1 0 9 91 1560K 5856K 2296K 1700K 2383M 82441 1 sleeping 1755113321 787 88934 Python 0.0 00:00.00 1 0 9 91 1560K 5856K 2296K 1700K 2383M 82441 1 sleeping 1755113321 786 88933 Python 0.0 00:00.00 1 0 9 91 1556K 5856K 2292K 1696K 2383M 82441 1 sleeping 1755113321 785 88932 Python 0.0 00:00.00 1 0 9 91 1556K 5856K 2292K 1696K 2383M 82441 1 sleeping 1755113321 784 88931 Python 0.0 00:00.00 1 0 9 91 1552K 5856K 2288K 1692K 2383M 82441 1 sleeping 1755113321 783 88930 Python 0.0 00:00.00 1 0 9 91 1612K 5856K 2288K 1752K 2383M 82441 1 sleeping 1755113321 783 88929 Python 0.0 00:00.00 1 0 9 91 1588K 5856K 2288K 1728K 2383M 82441 1 sleeping 1755113321 782 88927 Python 0.0 00:00.00 1 0 9 91 1608K 5856K 2284K 1748K 2383M 82441 1 sleeping 1755113321 781 88926 Python 0.0 00:00.00 1 0 9 91 1548K 5856K 2284K 1688K 2383M 82441 1 sleeping 1755113321 780 88924 Python 0.0 00:00.00 1 0 9 91 1556K 5856K 2276K 1700K 2383M 82441 1 sleeping 1755113321 778 88923 Python 0.0 00:00.00 1 0 9 91 1540K 5856K 2276K 1684K 2383M 82441 1 sleeping 1755113321 777 88922 Python 0.0 00:00.00 1 0 9 91 1540K 5856K 2276K 1684K 2383M 82441 1 sleeping 1755113321 776 88921 Python 0.0 00:00.00 1 0 9 91 1536K 5856K 2272K 1680K 2383M 82441 1 sleeping 1755113321 774 88920 Python 0.0 00:00.00 1 0 9 91 1528K 5856K 2264K 1672K 2383M 82441 1 sleeping 1755113321 771 88919 Python 0.0 00:00.00 1 0 9 91 1528K 5856K 2264K 1672K 2383M 82441 1 sleeping 1755113321 771 88918 Python 0.0 00:00.00 1 0 9 91 1528K 5856K 2264K 1672K 2383M 82441 1 sleeping 1755113321 770 ....
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I don't know how to kill them in one go.
ps ... | grep python .... kill?
what kind of python code do I need to add to avoid this miserable situation again. Thanks!
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B.Mr.W. over 10 yearsThe is 'you should have...' code to avoid this happen again, right? do you know how to kill all the processes generated by multiprocessing?
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Blacklight Shining about 10 years