On Fri, 7 Oct 2022 07:48:21 GMT, Aleksey Shipilev <sh...@openjdk.org> wrote:
> In GHA cross-compilation, we don't need everything from the sysroot, because
> we use native compilers for the compilation. Therefore, we can cut them even
> deeper and reclaim significant amount of cache space. This would also make
> cache eviction less likely, which saves time on recreating the sysroots when
> that happens.
>
> Current sysroots take about 300M per arch, which quickly multiplies up for
> multiple arches (we build 5 now), users (ballparking at about 200 active
> contributors). This amounts to about 1500M caches per job, and 300G in caches
> across our org for a single JDK tree. Update releases also use GHA for their
> testing, but the number of contributors there is lower. Still, I think it
> slides to TB territory now.
>
> In my local tests, new aarch64 sysroot tar.gz gets reduced from 315M to just
> 85M, about 3.7x improvement. Even deeper cuts are possible, but they would
> affect the redundant `.so`-s in `/usr/lib/${arch}/`. That would be much more
> fragile to do and might affect our builds. Therefore, I stopped at doing just
> these.
Seems fine to me. Nice space savings!
-------------
Marked as reviewed by erikj (Reviewer).
PR: https://git.openjdk.org/jdk/pull/10601
