Is there a way to pause a process (running from an executable) so that it stops the cpu load while it's paused, and waits till it's unpaused to go on with its work? Possibly in python, or in some way accessible by python.
- do you mean thread or running system process ?ukanth– ukanth2010-05-10 16:11:51 +00:00Commented May 10, 2010 at 16:11
- 1I would be inclined to lower process priority rather than "pausing" it. That way other processes will go firstNas Banov– Nas Banov2010-11-20 00:25:44 +00:00Commented Nov 20, 2010 at 0:25
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4 Answers
By using psutil ( https://github.com/giampaolo/psutil ):
>>> import psutil >>> somepid = 1023 >>> p = psutil.Process(somepid) >>> p.suspend() >>> p.resume() 
Comments
you are thinking of SIGTSTP -- the same signal that happens when you push CTRL-Z. This suspends the process until it gets SIGCONT.
of course, some programs can just catch and ignore this signal, so it depends on the executable. however, if you can suspend and resume it manually, you can do it from a python program, too. use os.kill()
2 Comments
kettlepot
and how do I unsuspend it so that it continues work from where it was before?
msw
SIGSTOP can't be blocked and would be slightly more accurate in this context, not coming from a tty. en.wikipedia.org/wiki/SIGSTOP
I just implemented this with signals in python something like this:
def mysignalhandler(sig, frame): print "Got " + str(sig) if sig == signal.SIGUSR1: do_something() signal.signal(signal.SIGUSR1, mysignalhandler) signal.pause() This will pause at the last line and call do_something() when it receives the signal USR1, for example through a
kill -USR1 <pid> command.
This will only work in UNIX though.
Comments
There is a (almost) native way of doing this in Python, and it's quite simple :
import time time.sleep(5) In this snippet, 5 is the number of seconds you want to pause your program.
1 Comment
bfontaine
This doesn’t answer the question; which is about pausing another process.