Re: EarlyOOM +ZRAM Only

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On Fri, Aug 14, 2020 at 7:34 AM John M. Harris Jr <johnmh@xxxxxxxxxxxxx> wrote:
>
> On Wednesday, August 12, 2020 1:16:34 PM MST Przemek Klosowski via devel
> wrote:
> > On 8/12/20 2:27 PM, Sergio Belkin wrote:
> >
> > > Hi!
> > > I 've just had a problem using EarlyOOM + ZRAM. I haven't a disk-based
> > > swap partition.
> > > I was using mainly Zoom (desktop app) + Firefox + VirtualBox (Debian
> > > with 4GB of RAM), and EarlyOOM killed Zoom in the middle of a call :(
> >
> >
> > This is weird---your swap was 100% full, and ram almost full, and yet
> > killing 4GB VirtualBox didn't seem to free up memory. I suspect some
> > sort of measurement or reporting error---if these numbers were accurate,
> > EarlyOOM did have a reason to panic and kill zoom. BTW, zoom taking 721
> > MiB is crazy.
> >
> > One possibility that comes to mind is that there's a process not
> > mentioned in the log (some system process???) that keeps allocating
> > memory as soon as it is freed by EarlyOOM, so killing the processes does
> > not result in increasing free memory (the first column).
> >
> > 399 of 15887 MiB ( 2.51%) SIGTERM "Web Content": badness 315, VmRSS 313 MiB
> > 397 of 15887 MiB ( 2.50%) SIGTERM "Web Content": badness 304, VmRSS 80 MiB
> > 379 of 15887 MiB ( 2.39%) SIGTERM "Web Content": badness 303, VmRSS 74 MiB
> > 335 of 15887 MiB ( 2.11%) SIGTERM "Web Content": badness 303, VmRSS 70 MiB
> > 315 of 15887 MiB ( 1.98%) SIGTERM "Web Content": badness 301, VmRSS 27 MiB
> > 288 of 15887 MiB ( 1.81%) SIGTERM "VirtualBoxVM":badness 212, VmRSS 4244
> > MiB 337 of 15887 MiB ( 2.13%) SIGTERM "zoom":        badness 36, VmRSS 721
> > MiB
> > Note how the full log helpfully mentions the actual tresholds for
> > SIGTERM: mem 2.52%, swap 10%, Where does 2.52 come from, pray?
>
> Are you kidding? The system still had over a quarter of a gigabyte of free
> RAM. There's no reason to start killing off processes at that point. That's
> tons of free memory. To put that into perspective, that's enough free memory
> to store over 1000 average-length novels directly in memory.
>

It's also enough to store 1/8th of a significantly complex Electron
process. It's *not enough*. Text is a terrible comparison when we're
working with programs.



-- 
真実はいつも一つ!/ Always, there's only one truth!
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