Message218588
Victor, thanks so much for reading my ticket and contacting me.
I prototyped what makes sense to me by subclassing subprocess.Popen and
Over-ridden the wait method to do what I suggested. Proof of concept
attached. \
It¹s a bit of a hack since I cribbed code from Popen.wait().
Now that you¹ve made me think harder, The use case that stood out was the
case
where I called the communicate() method which both handles IO and the
termination
of the process AFAICT.
I _do_ understand the portability argument you are making (and am clueless
about
what¹s to be done with windows).
‹ Thanks
‹ Don
On 5/14/14, 5:28 PM, "STINNER Victor" <report@bugs.python.org> wrote:
>
>STINNER Victor added the comment:
>
>I guess that you mean "Popen" when you write "Pipe"?
>
>Even if Popen has a high-level wait() method implemented with
>os.waitpid(), you are free to use a low-level function using the pid
>attribute.
>
>proc = subprocess.Popen(...)
>os.wait4(proc.pid, ...)
>
>> have an new data member, rusage, make the resource usage available to
>>the caller.
>
>I don't know how to get the rusage of a specific child process, but you
>can use resource.getrusage(resource.RUSAGE_CHILDREN) which gives the
>usage of *all* child processes. Again, you have the pid, and so you are
>free to use any function to retrieve the resource usage of the child
>process. See also this project which can help you:
>https://pypi.python.org/pypi/psutil
>
>I don't think that the subprocess should be modified to your use case,
>it's already possible to implement you use cases without modify it.
>Python is a (very) portable language, and it's very hard to provide the
>same API for such low-level metrics (rusage). I don't think that Windows
>provides exactly the same data for example.
>
>You can build your own module on top of subprocess and other modules like
>psutil.
>
>----------
>nosy: +haypo
>
>_______________________________________
>Python tracker <report@bugs.python.org>
><http://bugs.python.org/issue21504>
>_______________________________________
> |
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Date |
User |
Action |
Args |
2014-05-15 01:09:19 | donald.petravick | set | recipients:
+ donald.petravick, vstinner |
2014-05-15 01:09:19 | donald.petravick | link | issue21504 messages |
2014-05-15 01:09:15 | donald.petravick | create | |
|