Re: guix-daemon hitting systemd TasksMax

[Efraim Flashner <efraim@flashner.co.il>]

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On Fri, Apr 15, 2016 at 01:37:32AM +0200, Joram Schrijver wrote:
> Hi,
> 
> In version 228, systemd introduced a unit attribute `TasksMax`[1] that
> limits the number of tasks that can run in a unit. It has effect on
> kernel versions 4.3 and up, kernel threads and userspace process count
> towards the limit, and the default value is 512.
> 
> Running `guix pull` without changing any settings crashed for me,
> because building/testing texinfo hit this task limit. Increasing it to
> 1024 using `systemctl set-property guix-daemon.service TasksMax=1024`
> fixed the problem.
> 
> Because I expect guix-daemon to hit this limit regularly, it might be
> wise to set a higher `TasksMax` in the service file itself, perhaps even
> `infinity`. Doing this would, sadly, cause older systemd versions
> shipped by various distributions to complain about the existence of the
> attribute, so perhaps a mention in the manual would instead be enough.
> 
> 
> [1]:
> https://www.freedesktop.org/software/systemd/man/systemd.resource-control.html#TasksAccounting=
> 
> --
>   Joram
> 

If it complains but doesn't cause it to error out it might be worth it
to add it to etc/guix-daemon.service in the guix source tree as well as
mention it in the manual.

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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