[Tobias-Fischer]

The build workflows cut each stage into jobs of 25 recipes in list order, so one heavy job often holds up its whole stage. In the jazzy full rebuild, a single job was running alone for 55% of the time on Linux.

vinca: the pin moves to RoboStack/vinca@c52ce0c, the merge of RoboStack/vinca#179 (--timings, --keep-file).

Recording: rs <distro> build-ci appends each recipe's build time to distros/<distro>/work/build_timings.jsonl, in GitHub Actions only. vinca-gha's new --keep-file keeps that file as each build job's artifact.

Collecting: robostack-bot update-build-timings merges the last week's artifacts into shared/build_timings/<platform>.json, as {recipe: {distro: seconds}}, and opens a PR.

• It runs weekly on Mondays, together with the dependency reports.
• It can also be triggered by a comment, the issue form or Actions › Run workflow.
• Locally: pixi run python tools/build_timings.py.

Using: with times for the platform, rs <distro> gha passes vinca-gha --timings, using each recipe's average over the distributions. A recipe that's new to one distribution therefore still has a time.

• vinca packs each stage's recipes into jobs by time, and builds each compatibility package right after its package.
• Until a platform has times, its jobs are cut by count, as today.
• A workflow over GitHub's 500 KiB limit is retried with fewer runners first.

Checked:

• With the new vinca, rs jazzy gha --platform linux-64 on the full jazzy recipe set:
  • without times, it gives today's 117 jobs, each now ending with the artifact step;
  • with the measured jazzy times, it gives 219 jobs in 50 stages and a 440 KiB workflow.
• Simulated with the measured times, that is 6.96 h → about 2.5 h on linux-64.
• rs check and the 49 tool tests pass.

Also moves the vinca pin past the merged #176, #177 and #178:

• #176: Windows exit codes;
• #177: job names without the ros2- prefix;
• #178: short CMake object paths on Windows.

None of these change build hashes. #178 makes the rosbag2_performance_benchmarking_msgs setting in shared/pkg_additional_info.yaml redundant; I'll remove that separately.

Labelled build:none: no packages change, so only the checks run.

🤖 Claude (AI assistant), on behalf of @Tobias-Fischer

🤖 Generated with Claude Code

[Tobias-Fischer]

Thanks @baszalmstra @traversaro for the quick vinca review. Are you ok with this PR as well?

[baszalmstra]

yes! 👍

[Tobias-Fischer]

Thanks both!