I just came across these in the elasticsearch CI as well. I’ve opened https://github.com/apache/lucene/pull/15563 to backport some of Robert’s changes.
> On 12 Jan 2026, at 14:24, Robert Muir <[email protected]> wrote: > > On Mon, Jan 12, 2026 at 5:38 AM Dawid Weiss <[email protected]> wrote: >> >> >> There is significant variance between runs on github - I think this view >> shows it clearly: >> >> https://github.com/apache/lucene/actions/workflows/run-checks-all.yml?query=branch%3Amain >> https://github.com/apache/lucene/actions/workflows/run-checks-all.yml?query=branch%3Abranch_10x >> >> The slowness on 10x may be attributed to some cleanups to tests that have >> been only applied to main. This is my guess, at least. It would be worth >> reviewing and >> reapplying those to 10x as well. >> > > There were some particular tests that were extremely slow on windows and > macos. > > But also there were some fairly invasive improvements on build side > related to this problem: > * we switched to more efficient runners on pr/push (ubuntu24.04-arm) > and only triggering the macos at night. > * use default flags (C2 compiler disabled, number of cores detection), > this had a very large impact. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] >
