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ci: the macOS bundle build takes 75 to 111 minutes since symbols were turned on #363
Description
The optimized bundle build in Native desktop - macOS arm64 took 38m 23s on 2026-11-05 ([optimized]). Since pull request 301 added the symbol profile (strip none, debug line-tables-only, split-debuginfo packed) it has taken 73m 41s (2026-11-07), 109m 51s (2026-11-09) and 106m 41s (2026-11-13), all with a Rust cache hit.
Not known:
- how the time splits between the compiler, the link and
dsymutil(the job log has no timing inside that phase); - why it grew from about 75 to about 107 minutes after 2026-11-07 (server source grew about 5% in that time).
Suggested first step: one CI run with cargo build --timings on the bundle build and a timestamp around dsymutil, then decide between dependency-level debug = false, split-debuginfo = unpacked with one later dsymutil, or leaving it.
Found while diagnosing the timeouts fixed in #359, which removed the second full build but not this cost.
🤖 Generated with Claude Code
Activity
mubeda commentedon Nov 14, 2026
Measured in pull request 370 (manual full run of the branch, 2026-11-14).
dsymutil(seen once, 108 MB) and not in the symbol dump (under 30 s). Locally the symbol profile costs nothing: 1260 s against 1299 s.bibcode-serverandbibcode-desktopin CI only, the bundle build took 59 min 18 s on macOS arm64 (87 min 51 s before, nothing cached both times) and 54 min 53 s on macOS x64 (69 to 101 min before). Release still builds the shipped profile.Not proven: what exactly doubled the build on 2026-11-06, since this run changed the codegen units too. Memory pressure is the supported explanation. Details:
docs/plans/2026-11-14-ci-build-times/research/measured_ci_and_local.md.