[Pywps-dev] [GSOC] Process control

[Jachym Cepicky]

Jan, suspend/resume, termine - yes, that seems to be it, nice example

J

po 23. 5. 2016 v 23:59 odesílatel Jan Rudolf <rudolja1 at fit.cvut.cz> napsal:

> Thanks you both for comments. I created a simple example of
> pause/suspend, resume, termination here
> https://github.com/jan-rudolf/python-process-control. Try to run it.
> It's a combination of multiprocessing and psutil library. I hope, the
> README me explain it well.
>
> Dne 2016-05-23 10:14, Jonas Eberle napsal:
> > Hi,
> >
> > please be aware the "ctrl-z" is not pausing the process, it puts the
> > process in the background (still running). From the terminal you can
> > then start another process. So this is not about pausing and resuming.
> > I quickly found an example how it could work, first put the process in
> > the background, second stop (kill -STOP) the process and third resume
> > (kill -CONT) the process:
> >
> http://vertito.blogspot.de/2007/11/stop-pause-and-continue-linux-process.html
> >
> > But be aware, pausing and resuming are always OS dependent tasks. This
> > need to be taken into account.
> >
> > Cheers,
> > Jonas
> >
> > ----- Am 22. Mai 2016 um 23:20 schrieb Jachym Cepicky
> > <jachym.cepicky at gmail.com>:
> >
> >> Hi,
> >> thanks for the info. About "controlling": we need at least "kill",
> >> "pause" and "resume" process. As far as I understand it, kill could
> >> be implemented using os.kill (if you know the process ID from the
> >> operating system point of view - it should be stored in the sqlite
> >> database for now). For pause and resume, I would suggest to find
> >> similar way as hitting "ctrl-z" in the command line, which "pauses"
> >> running process in the terminal and to get it in frontend again, you
> >> run the "fg" command - if you undestand what I'm talking about. I
> >> did not study, how this is usually done on system level (in unix
> >> systems), this is just my practical observation
> >> J
> >>
> >> so 21. 5. 2016 v 23:14 odesílatel Jan Rudolf <rudolja1 at fit.cvut.cz>
> >> napsal:
> >>
> >>> Hello,
> >>>
> >>> I want to inform you about my status: my semester in school ends
> Thank you both for comments. I created simple script in repo
> https://github.com/jan-rudolf/python-process-control
>
> >>> tomorrow. I've got final exams from Graph algorithms this Thursday
> >>> and
> >>> from Linear algebra a week after. Hope, I make it without problems
> >>> (these two are the hardest), the rest will be ok/not that time
> >>> consuming.
> >>>
> >>> Jachym specified top 4 goals for me on IRC meeting:
> >>> step 1: you get PyWPS up and running and you will be able to run
> >>> several
> >>> asynchronous processes on your computer
> >>> step 2: find out, what is the python way to control (and if
> >>> possible) in
> >>> background running processes
> >>> step 3: create API (rest) for this controlling
> >>> step 4: if there is time, create web UI
> >>>
> >>> I have working PyWPS with Apache on my computer. Don't know if
> >>> it's the
> >>> case, that I have Mac OS, but I had a little bit trouble to set up
> >>> according to Github - so I can check it later on Ubuntu for
> >>> example
> >>> and/or make a manual for Mac. So step 1 is done.
> >>>
> >>> Next is step 2. I would like to in next week or two create
> >>> demonstrative
> >>> applications (not interfering PyWPS repo) about possibilities of
> >>> the
> >>> control of processes in Python (with the focus on our
> >>> functionality) as
> >>> template cases for an integration into PyWPS source code. Then
> >>> integration, REST API, so on...
> >>>
> >>> All the best, Jan Rudolf
> >>>
> >>> _______________________________________________
> >>> pywps-dev mailing list
> >>> pywps-dev at lists.osgeo.org
> >>> http://lists.osgeo.org/mailman/listinfo/pywps-dev
> >>
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