[DRE-maint] Bug#853164: Default tasks max seems too low

[Sjoerd Simons]

Package: obs-worker
Version: 2.7.1-9
Severity: normal

While doing a test build of quite a few diferent package, I'm running into an
issues like:

[   25s] /srv/obs/run/worker/1/build/init_buildsystem: fork: retry:
Resource temporarily unavailable

Starting from systemd v231 each service gets 15% of the maximum amount of tasks
of the system. Which should be enough for most services, but when running a
set of worker instances this can spike up during some builds and dos others.

A reasonable fix would probalby to add a systemd override to the package to
bump this to say 75% by default?


-- System Information:
Debian Release: 9.0
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386, armhf

Kernel: Linux 4.9.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)