Upgrading to Emacs 26.3 seems to have fixed the memory problem but now
there's another problem ... emacs becomes incredibly sluggish (almost
unuseable) -- top(1) shows 70-100% CPU utilization even when the
compilation step isn't outputting anything. (I use GNU parallel on the
tests, with options to preserve the output order, so output happens at
intervals.)

The compilation command is "find ... | sort | nice parallel -j 8
--keep-order --group -L80" (on a 4 CPU machine).
I tried reducing the number of parallel jobs to 3, but that didn't help.

Should I open a new bug for this? If so, what information can I collect, to
help determine the cause?

On Mon, 16 Dec 2019 at 06:24, Noam Postavsky <npostavs@gmail.com> wrote:

> Peter Ludemann <peter.ludemann@gmail.com> writes:
>
> > I ran a large compilation (to the *compilation* buffer) (232,701 lines,
> > 52M).
>
> > In GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21)
> >  of 2017-09-22, modified by Debian built on lgw01-amd64-050
> > Windowing system distributor 'The X.Org Foundation', version
> 11.0.11906000
> > System Description: Ubuntu 18.04.3 LTS
>
> I think this is a variant of Bug#26952 - "repeated buffer insertion
> (e.g. yank-rectangle) consumes excessive memory (4GB+ for 90MB of
> text)".  I recommend upgrading to version 26.
>
>
>