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Re: RFC: subcommand to pause/resume builds
From: |
Ludovic Courtès |
Subject: |
Re: RFC: subcommand to pause/resume builds |
Date: |
Tue, 03 Nov 2020 14:53:07 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) |
Hi,
John Soo <jsoo1@asu.edu> skribis:
> I was looking to pause a long build today and asked on IRC how to
> accomplish pause/resume. It seems this is possible already with the
> following:
>
> kill --signal SIGSTOP|SIGCONT {pids-of-build-process-tree}
>
> There is already a command to list the processes associated to guix
> commands: guix processes. Perhaps pause/resume can be a subcommand or
> set of flags to guix processes. The following is the first thing that
> comes to mind:
>
> guix processes --pause package-name ... --resume package-name ...
>
> What do you think?
First, note that the daemon is unaware of “packages”, it only knows
about “derivations”.
Second, ‘guix processes’ is nice but it uses low-level heuristics to
determine what daemon sessions are open, what their clients are, and
what they’re building; it resorts to heuristics because the daemon as it
stands doesn’t have a way to communicate its current state. It works
well in practice, but still I wouldn’t go too far building around it.
Last, you’d need to send SIGTSTP to the whole process group of the
build, like so (I think, haven’t tried):
sudo kill -TSTP -123
where 123 is the “SessionPID” shown by ‘guix processes’. However, doing
so may affect build results: processes in the build environment might
handle SIGTSTP specially, which can have side effects. It’s an
observable action.
Conclusion: I don’t think we can implement this reliably.
HTH!
Ludo’.
- RFC: subcommand to pause/resume builds, John Soo, 2020/11/02
- Re: RFC: subcommand to pause/resume builds,
Ludovic Courtès <=
- Re: RFC: subcommand to pause/resume builds, John Soo, 2020/11/03
- Re: RFC: subcommand to pause/resume builds, Tobias Geerinckx-Rice, 2020/11/03
- Re: RFC: subcommand to pause/resume builds, Tobias Geerinckx-Rice, 2020/11/03
- Re: RFC: subcommand to pause/resume builds, John Soo, 2020/11/03
- Re: RFC: subcommand to pause/resume builds, John Soo, 2020/11/03
- Re: RFC: subcommand to pause/resume builds, Ludovic Courtès, 2020/11/06
- Re: RFC: subcommand to pause/resume builds, John Soo, 2020/11/06
Re: RFC: subcommand to pause/resume builds, Bengt Richter, 2020/11/04