Re: [PATCH v3 0/5] Improving apt cache

["Roberto A. Foglietta" <roberto.foglietta@gmail.com>]

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On Fri, 20 Jan 2023 at 14:04, Moessbauer, Felix <
felix.moessbauer@siemens.com> wrote:

> On Fri, 2023-01-20 at 08:31 +0100, Uladzimir Bely wrote:
> > Currently, apt cache (e.g. `var/cache/apt/archives`) import and
> > export
> > functions are not optimal. Multiple files are copied from global
> > DL_DIR to package WORKDIR, increasing disk IO and space needed.
> >
> > Also, various chroots (bootstrap, buildchroot, sbuild chroot) include
> > their apt caches to sstate cache files.
> >
> > This patchset switches to hardlinks instead of copies and removes apt
> > cache from bootstrapped images ans sstate caches.
>
> I tested this series (v3) in two layers: amd64 (internal) and arm64
> (meta-iot2050) and can confirm that it works. Also we get a significant
> performance improvement and massively reduced disk consumption.
>
>
The candidate describes the following situation in plain straight words:

Q: input: ln -sf, output: cp -Ln
A: much ado for nothing (cit.)

Q: How does the candidate execute the tests on the system?
A: I don't but my gut feelings

Q: What alternative does the candidate propose?
A: an elegant solution because quality is relative but elegance is absolute
(cit.)

Q: summarise it in a nerd language
A:

mkdir tmp && ( cd tmp; mkdir a b
echo pippo > a/file.txt
ln -sf $PWD/a/file.txt b
cat a/file.txt b/file.txt
# pippo
# pippo
echo pluto >b/file.txt
cat a/file.txt b/file.txt
# pluto
# pluto
rm -f b/file.txt
echo ciao >b/file.txt
cat a/file.txt b/file.txt
# pluto
# ciao
cp -Ln b/file.txt a/file
cat a/file.txt b/file.txt
# pluto
# ciao
cd ..; rm -rf tmp ) # to repeat in loop

Enjoy, R-

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