Hello, On Sun 24 Nov 2024 at 07:53am +01, Johannes Schauer Marin Rodrigues wrote:
> Hi, > > Quoting Sean Whitton (2024-11-24 01:23:24) >> This is interesting. One concern I have is speed -- isn't it always slower >> to have to unpack a tarball before the build instead of having a chroot under >> /srv/chroot that's always unpacked? > > that is correct. Unpacking a tarball takes time. Having an already unpacked > directory present will be faster. Lets look at how slow unpacking a buildd > chroot tarball is in practice. My machine is an ARM Cortex A73 with 3.6 GB > RAM. > > $ time sudo tar -C chroot -xf ~/.cache/sbuild/unstable-arm64.tar > sudo tar -C chroot -xf ~/.cache/sbuild/unstable-arm64.tar 0.01s user 0.02s > system 2% cpu 0.983 total > > This number will of course be different on your system. If your system is > slower than mine or if your chroot tarballs contain a lot more pre-built > packages, then unpack times will be longer than this. > > In principle, unshare mode can also work with directories. Helmut is working > on something in that direction. But for me personally, one second of unpack > time is not enough of a motivation for me to put time into directory+overlayfs > support. But of course patches welcome! Yes, one second is not that bad at all. It takes longer than that on the porterboxes, and that is my most recent experience, so I was thinking of that. Thanks for the timings. -- Sean Whitton
