Re: Fedora 32 System-Wide Change proposal (late): Enable EarlyOOM

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On Fri, Jan 10, 2020 at 2:05 AM Lennart Poettering <mzerqung@xxxxxxxxxxx> wrote:
>
> On Mi, 08.01.20 12:24, Chris Murphy (lists@xxxxxxxxxxxxxxxxx) wrote:
>
> > On Mon, Jan 6, 2020 at 11:09 AM Lennart Poettering <mzerqung@xxxxxxxxxxx> wrote:
> > >
> > > - facebook is working on making oomd something that just works for
> > >   everyone, they are in the final rounds of canonicalizing the
> > >   configuration so that it can just work for all workloads without
> > >   tuning. The last bits for this to be deployable are currently being
> > >   done on the kernel side ("iocost"), when that's in, they'll submit
> > >   oomd (or simplified parts of it) to systemd, so that it's just there
> > >   and works. It's their expressive intention to make this something
> > >   that also works for desktop stuff and requires no further
> > >   tuning. they also will do the systemd work necessary. time frame:
> > >   half a year, maybe one year, but no guarantees.
> >
> > Looks like PSI based oom killing doesn't work without swap. Therefore
> > oomd can't be considered a universal solution. Quite a lot of
> > developers have workstations with quite a decent amount of RAM,
> > ~64GiB, and do not use swap at all. Server baremetal are likewise
> > mixed, depending on workloads, and in cloud it's rare for swap to
> > exist.
> >
> > https://github.com/facebookincubator/oomd/issues/80
> >
> > We think earlyoom can be adjusted to work well for both the swap and
> > no swap use cases.
>
> Isn't rearlyoom also watching the swap metrics only?

No, memory free and swap free, as a percentage. Super simplistic. If
there is no swap, then the percent only applies to MemAvailable.

https://pagure.io/fedora-workstation/issue/119#comment-619749


-- 
Chris Murphy
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