Adding niceness to container processes

[Jörg Sommer]

Hello,

having one or two `kas-container build` running might slow down your system. The Linux kernel has some knobs to tell that processes should run on lower priority. Unfortunately, Docker has no options to change these settings, which makes support from container-entrypoint necessary. Would a patch like this and the necessary adaptions in kas-container get accepted?

@@ -63,6 +63,14 @@

      cd /builder || exit 1

 fi

 

+if [ -n "$KAS_NICE" ]; then

+     unset KAS_NICE

+     ionice -c 3 -p $$ >/dev/null

+     chrt --batch -p $$ >/dev/null

+     choom -n 1000 -p $$ >/dev/null

+     renice -n 10 -p $$ >/dev/null

+fi

+

 if [ -n "$1" ]; then

      case "$1" in

      build|checkout|dump|for-all-repos|menu|shell|-*)

Kind regards

Jörg Sommer

Software Developer / Programmierer

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[Jan Kiszka]

On 22.09.23 15:04, 'Jörg Sommer' via kas-devel wrote:
> Hello,
>
> having one or two `kas-container build` running might slow down your
> system. The Linux kernel has some knobs to tell that processes should
> run on lower priority. Unfortunately, Docker has no options to change
> these settings, which makes support from container-entrypoint necessary.

Already tried

docker update --cpu-shared X <my-container>?

I'm using this for freeing some cores from time to time:

docker update --cpus N <my-container>

Jan

--
Siemens AG, Technology
Linux Expert Center

[Jörg Sommer]

On 22 September 2023 17:24, Jan Kiszka wrote:
> On 22.09.23 15:04, 'Jörg Sommer' via kas-devel wrote:
> > Hello,
> >
> > having one or two `kas-container build` running might slow down your
> > system. The Linux kernel has some knobs to tell that processes should
> > run on lower priority. Unfortunately, Docker has no options to change
> > these settings, which makes support from container-entrypoint necessary.
>
> Already tried
>
> docker update --cpu-shared X <my-container>?

Today I ran a test with three `kas-container --runtime-args '--cpu-shares=512' build`. After half an hour of working, I reniced the container processes and the system got more responsive, especially the mouse pointer doesn't jump no longer and switching windows was smoother.

Jörg Sommer

--
Navimatix GmbH