Re: Graceful Process / Script Termination

[Ole Tange]

https://savannah.gnu.org/bugs/index.php?59146 has been closed.

/Ole

On Wed, Sep 23, 2020 at 12:44 PM Nachtigall, Jens (I/EK-Z6)
<jens.nachtigall@audi.de> wrote:
>
> Thanks for the feedback and for looking into it / opening a ticket!
> I have no experience in Perl at all, I'm afraid. This is why I wasn't able to 
> dig deeper into your code.
>
> Indeed, my use-case is dependent on the termination sequence. Yet, I can 
> honor a fixed termination signal for the toolchain to use.
> Can you remind me / document what the default termination signal for remote 
> jobs is? What signal does the remote wrapper send to remotely spawned 
> processes if not default?
>
> Regarding behavior documentation:
> When cancelling GNU Parallel running remote jobs, it returns immediately. 
> Indicated on 
> https://www.gnu.org/software/parallel/parallel_design.html#The-remote-system-wrapper,
>  there is the "Remote Wrapper" which acts as a fallback mechanism to 
> terminate remote jobs. Yet, there is no feedback channel for GNU Parallel to 
> know when the remote processes actually stopped thus it returns immediately 
> upon CTRL-C. This leaves the impression as if nothing happened although I 
> know that terminating my remote jobs takes about 20 - 30 seconds while on 
> local instances GNU Parallel blocks until the jobs are terminated properly.
>
> As I came across the "parallel_design" page fairly late, maybe linking it 
> here 
> https://www.gnu.org/software/parallel/man.html#EXAMPLE:-Using-remote-computers
>  would have saved some time on experimenting.
>
> All the best
> Jens
>
>
>
> INTERNAL
>
> -----Ursprüngliche Nachricht-----
> Von: Ole Tange <ole@tange.dk>
> Gesendet: Sonntag, 20. September 2020 00:45
> An: Nachtigall, Jens (I/EK-Z6) <jens.nachtigall@audi.de>
> Cc: parallel@gnu.org
> Betreff: Re: Graceful Process / Script Termination
>
> On Thu, Sep 17, 2020 at 6:07 PM Nachtigall, Jens (I/EK-Z6) 
> <jens.nachtigall@audi.de> wrote:
>
> > The only very misleading thing is, that GNU Parallel terminates and returns 
> > immediately, regardless.
>
> Please help write what should have been written in the documentation, so you 
> would have known this, because absolutely nothing is obvious around the 
> remote wrapper.
>
> Re-reading the wrapper I can see, that --termseq is not supported at all for 
> remote jobs, so I have created
> https://savannah.gnu.org/bugs/index.php?59146
>
>
> /Ole