Am 21.07.2016 um 19:28 schrieb Yuri D'Elia: > On Thu, Jul 21 2016, Michael Biebl <bi...@debian.org> wrote: >> And in Debian we build against libxz, so xz compression is used for core >> files. > > Indeed, and it's pretty slow. > >> What would we gain by switching from xz to lz4. Can you provide numbers? > > I don't have enough time to back it up comparing exactly the difference > between LZ4 and XZ in coredump, but if you compare regular XZ to LZ4 you > can expect anywhere between 10x and 50x improvement in compression > speed while maintaining an acceptable compression ratio.
So, building systemd with lz4 support means, that /lib/systemd/libsystemd-shared-*.so and /lib/*/libsystemd.so.* will get a dependency on liblz4. liblz4 on the other hand is installed in /usr/lib. The /lib/systemd/systemd binary itself links against libsystemd-shared (interestingly, our debian/rules check seems to not have caught this). So, we can finally give up on the idea of split-usr and no initramfs (and need to communicate that) or have liblz4 moved from /usr/lib to /lib first. liblz4 should probably gain a Build-Depends-Package line in that case, so we can enforce a tight enough dependency. Like it was done for libapparmor. Atm, the dependency we get via the symbols file is (>= 0.0~r113) -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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