[Pywps-dev] [GSOC] First week & my progress

[Jachym Cepicky]

Jonas, AFAIK, from my "just user oriented" point of view, hitting ctrl-z
pauses the process (see then result from "jobs"), process is send to
background using "bg" or fogreground "fg" command

$ yes
ctrl-z
$ jobs
$ bg

yes, the process is still in memory, waiting, but not running, but not
consuming processor time

yes, this is related to operating system (could be tricky on windows)

as far as I understand it

J


po 23. 5. 2016 v 10:14 odesílatel Jonas Eberle <jonas.eberle at gmx.de> 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
>> 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
>>
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>
>
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