Write about CI improvements

Author: delan

_posts/2025-11-02-this-month-in-servo.md

@@ -22,6 +22,9 @@ Servo now supports several new web platform features:
     <img src="{{ '/img/blog/2025-11-diffie.png' | url }}" alt="servoshell nightly showing new support CompressionStream and synthetic bold">
 </figure>
 
+**servoshell** for **macOS** now ships as **native Apple Silicon binaries** (@jschwe, #39981).
+Building servoshell for macOS amd64 still works for now, but is no longer officially supported by automated testing in CI (see *§ For developers*).
+
 In **servoshell** for **Android**, you can now enable **experimental mode** with just two taps (@jdm, #40054), use the **software keyboard** (@jdm, #40009), deliver **touch events** to web content (@mrobinson, #40240), and dismiss the location field (@jdm, #40049).
 **Pinch zoom** is now fully supported in both Servo and **servoshell**, taking into account the locations of pinch inputs (@mrobinson, @atbrakhi, #40083) and allowing keyboard scrolling when zoomed in (@mrobinson, @atbrakhi, #40108).
 
@@ -115,6 +118,16 @@ Servo now does **zero unnecessary layout work** when **updating canvases** and *
 
 We’ve fixed crashes when clicking on web content on Android (@mrobinson, #39771), and when running Servo on platforms where JIT is forbidden (@jschwe, @sagudev, #40071, #40130).
 
+## For developers
+
+CI builds for **pull requests** should now take **70% less time**, since they now run on self-hosted CI runners (@delan, #39900).
+**Bencher builds** for runtime benchmarking now run on our new [dedicated](https://ci3.servo.org) [servers](https://ci4.servo.org), so our [Speedometer](https://bencher.dev/perf/servo?branches=52e1e9bb-959c-4171-a53d-e06bd694a6c1&testbeds=d742c702-3842-4108-9d0c-2db74e57599a%2Cd5e49dbe-b866-453a-b6ac-1cc2c452b846&benchmarks=0df0380f-9809-45bc-b525-b6ad9d5fbe91%2Cf7c6adb5-e702-42bc-902c-d2154b1e2428&measures=e71c685b-9ce9-4abc-a55d-a1de2ffe04fb&start_time=1733011200000&end_time=1764460800000) and Dromaeo data should now be more accurate and less noisy (@delan, #39272).
+
+We’ve now switched all of our macOS builds to run on arm64 (@sagudev, @jschwe, #38460, #39968).
+This helps back our macOS releases with thorough automated testing on the same architecture as our releases, but we can’t run them on self-hosted CI runners yet, so they may be slower for the time being.
+
+Work is underway to set up faster macOS arm64 runners on our own servers (@delan, [ci-runners#64](https://github.com/servo/ci-runners/pull/64)), funded by your donations. Speaking of which!
+
 ## Donations
 
 <!--

outline.txt

@@ -1,9 +1,11 @@
 - dev
+    - DONE https://github.com/servo/servo/pull/39981	(@jschwe, #39981)	Fix nightly upload with arm64 (#39981)
+      dev
     - https://github.com/servo/servo/pull/39625	(@delan, #39625)	NixOS: bump nixpkgs and fix etc/devtools_parser.py (#39625)
       dev; on nixos and nix, upgrade from LLVM 14 to 20, and fix some build issues
     - https://github.com/servo/servo/pull/39789	(@jschwe, @sagudev, #39789)	Add unittest code coverage to CI  (#39789)
       dev; unit tests now have code coverage in CI
-    - https://github.com/servo/servo/pull/39272	(@delan, #39272)	ci: Run bencher jobs on self-hosted runners (#39272)
+    - DONE https://github.com/servo/servo/pull/39272	(@delan, #39272)	ci: Run bencher jobs on self-hosted runners (#39272)
       dev; CI jobs for runtime benchmarks now run on self-hosted runners
     - https://github.com/servo/servo/pull/39812	(@jschwe, #39812)	testing: Use nextest for unit-tests (#39812)
       dev
@@ -15,7 +17,7 @@
       dev
     - https://github.com/servo/servo/pull/38460	(@sagudev, #38460)	ci: Add MacOS Arm64 workflow and run it in full (#38460)
       dev
-    - https://github.com/servo/servo/pull/39900	(@delan, #39900)	ci: Tokenless self-hosted runner select (#39900)
+    - DONE https://github.com/servo/servo/pull/39900	(@delan, #39900)	ci: Tokenless self-hosted runner select (#39900)
       dev; self-hosted CI for pull requests
 - dom
     - https://github.com/servo/servo/pull/39506	(@tharkum, #39506)	html: Allow legacy referrer policies only for <meta> referrer (#39506)

tools/commits.txt

@@ -1803,7 +1803,7 @@ https://github.com/servo/servo/pull/39834	(@Loirooriol, #39834)	layout: Make inl
     # for the relevant part in gecko.
     # Testing: This change adds a test Part of #34527
 +https://github.com/servo/servo/pull/39272	(@delan, #39272)	ci: Run bencher jobs on self-hosted runners (#39272)
-    dev; CI jobs for runtime benchmarks now run on self-hosted runners
+    ;dev; CI jobs for runtime benchmarks now run on self-hosted runners
     # some bencher jobs, specifically linux release profile jobs, measure runtime perf by running speedometer and dromaeo.
     # doing this on GitHub-hosted runners is suboptimal, because GitHub-hosted runners are not under our control and their
     # performance can vary wildly depending on what hosts we get and how busy they are.
@@ -2238,7 +2238,7 @@ https://github.com/servo/servo/pull/39914	(@yezhizhen, #39914)	base: Do not prin
 From https://github.com/servo/servo
  * branch                    d6f7a995230fbca9294e5db5c428801ecc34677f -> FETCH_HEAD
 warning: not reachable from default branch: d6f7a995230fbca9294e5db5c428801ecc34677f
--https://github.com/servo/servo/pull/Fix nightly upload with arm64	(@jschwe, #Fix nightly upload with arm64)	Fix nightly upload with arm64
++https://github.com/servo/servo/pull/Fix nightly upload with arm64	(@jschwe, #Fix nightly upload with arm64)	Fix nightly upload with arm64
 jq: invalid JSON text passed to --argjson
 Use jq --help for help with command-line options,
 or see the jq manpage, or online docs  at https://stedolan.github.io/jq
@@ -3686,7 +3686,7 @@ https://github.com/servo/servo/pull/40037	(@Loirooriol, #40037)	layout: Simplify
     # WebRender API.  Since I cannot reproduce this problem locally, this is just an attempt to fix the issue.
     # Testing: This should fix crashes observed with the unit tests.  Fixes: #40173.
 +https://github.com/servo/servo/pull/39900	(@delan, #39900)	ci: Tokenless self-hosted runner select (#39900)
-    dev; self-hosted CI for pull requests
+    ;dev; self-hosted CI for pull requests
     # one of the biggest gaps in our self-hosted runner coverage is that pull request checks can’t run on self-hosted runners,
     # because reserving a runner currently requires a MONITOR_API_TOKEN secret that is unavailable to pull requests.
     # this patch replaces the authenticated requests to POST /profile/<image>/take?unique_id&qualified_repo&run_id