Re: Heads-up / for discussion: dnf not working with 1G of RAM or less

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On Mon, Aug 22, 2022 at 05:44:26PM -0700, Adam Williamson wrote:
> Hey folks! I apologize for the wide distribution, but this seemed like
> a bug it'd be appropriate to get a wide range of input on.
> 
> There's a bug that was proposed as an F37 Beta blocker:
> https://bugzilla.redhat.com/show_bug.cgi?id=1907030
> 
> it's quite an old bug, but up until recently, the summary was
> apparently accurate - dnf would run out of memory with 512M of RAM, but
> was OK with 1G. However, as of quite recently, on F36 at least (not
> sure if anyone's explicitly tested F37), dnf operations are commonly
> failing on VMs/containers with 1G of RAM due to running out of RAM and
> getting OOM-killed.

The discussion in the bug indicates that this memory growth is related to
loading of the full filepath dataset. We have been discussing splitting
out the non-primary-filepath-data (i.e. paths that are not /etc, /usr/bin,
/usr/sbin), out into a separate lazilly-loaded file. If we manage to do
that, we'll kill two birds with one stone:

- initial download of repo metadata on every freakin' dnf operation can
  go down from 80 to 20 MB
- the peak memory use will go down

Apparently DNF5 makes this possible.
My vote is: yes, this is an issue. No, we shouldn't block F37 on this.
Apparently the only reasonable way to tackle this is with a major rework
of DNF, so let's get it right with DNF5.

Zbyszek
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