Re: guix-daemon hitting systemd TasksMax

[Leo Famulari <leo@famulari.name>]

On Sun, Apr 17, 2016 at 12:46:16AM +0200, Ludovic Courtès wrote:
> Leo Famulari <leo@famulari.name> skribis:
> 
> > On Sat, Apr 16, 2016 at 03:12:15PM +0200, Joram Schrijver wrote:
> >> I am running Arch Linux, also with systemd 229. It doesn't look like
> >> Debian applies any patches to systemd, so our installations should
> >> pretty much be the same.
> >> 
> >> Perhaps the limit is only reached during the build process of some
> >> specific packages?
> >
> > `guix pull` usually doesn't build any packages, but sometimes it does
> > need to. My (limited) understanding is that it sometimes needs to build
> > (or download) updated dependencies of Guix itself.
> >
> > Do you think the number of "Tasks" would increase with more cores? I
> > only have 4 cores on my machines. Maybe if you had more, the builders
> > spawned by your guix-daemon would run more tasks as a consequence of
> > using all the cores.
> 
> Right, ‘guix pull’ entails a build of Guix using as many cores as
> possible, with one process per core (and I think each Guile has two
> threads, one of which is the signal delivery thread.)
> 
> So, if the limit on the total number of threads + processes is 512 and
> you have 256 cores or more (lucky you!), you may hit the limit.

Joram, are you this lucky? ;)