Research: a browser (Chromium or Firefox) as a canvas window type #140
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opened 2026-10-09 09:27:33 +00:00 by kayg
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kayg/infraternal#140
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Owner 2026-10-09 (D200 in main
61309f22). Research only: measured candidates and a recommendation; the owner decides foundational choices.Starting browser-window research on branch research-browser; base SHA
63b1f10e21.CDP finding: Chromium 156.0.8078.4
Page.startScreencastreturned 393×852 at requested 393×852 DPR 2, rather than D200’s 786×1704 target. At 1440×900, the receiver presented 21.77 fps (JPEG q90, p95 242 ms) and 22.60 fps (PNG, p95 199 ms); source PSS was 501.6/482.4 MiB and CPU 1.420/1.676 cores. At the phone request, it presented 56.07/46.49 fps (JPEG/PNG, p95 83/107 ms) at the wrong dimensions; PSS 434.0/439.1 MiB and CPU 0.704/0.728 cores. These are local capture-to-canvas measurements under host load average 18.03/16.38/21.11 to 14.14/15.60/20.59, not network latency. Evidence: research/browser-window/spikes/evidence.md.Native capture comparison is unavailable here: Xvfb is installed, but FFmpeg has no X11/PipeWire input,
/dev/drihas no render node and its onlycard0is unreadable; the #139 VA-API probe returnedNo VA display found(exit 234). No native-pipeline number was inferred from the separate #139 x264 encode-only benchmark.Correction/final spike pass: the earlier frame-rate values were a preliminary run; use the scratch-contained run in research/browser-window/spikes/evidence.md. At 1440×900 it presented 1.21 fps (JPEG q90, p95 3,417 ms) and 7.37 fps (PNG, p95 1,174 ms); source CPU/PSS were 0.611 cores/500.0 MiB and 1.091 cores/508.6 MiB. At the 393×852 DPR 2 request it again returned 393×852 instead of 786×1704, at 3.97 fps/1,083 ms p95 JPEG and 5.55 fps/1,054 ms p95 PNG; CPU/PSS were 0.410/448.8 and 0.456/445.4. Load average rose from 8.46/10.95/17.72 to 18.79/13.76/18.12 during the pass, so these rates are not capacity estimates. The DPR mismatch is repeatable; throughput is load-sensitive.
Fast gate attempt reached the latency proxy self-test but failed: configured 300 ms RTT measured p50=330.64 ms and p99=383.26 ms. Host load average was 25.62/22.27/20.51 on 8 logical CPUs. This row is outside the allowed host-load baseline exceptions, so it is not being waived; rerunning the full gate in a high-weight user scope.
The scoped fast gate reached static builds but failed because
.cargo/musl-cc.shresolves Zig from<worktree>/target/auth-tools/zig/zigeven withCARGO_TARGET_DIRin job scratch. The gate's Zig copy and Cargo output are under/home/kayg/.cache/codex-scratch/research-browser/target; a temporary untrackedtargetsymlink to that directory will let the existing wrapper resolve Zig while keeping build data in scratch. No tracked product code changes are planned for this path mismatch.Step complete: committed the local Chromium CDP runner, run instructions and final scratch-contained evidence as
70cfd594. The final pass measured 1.21–7.37 canvas fps at 1440×900 and 3.97–5.55 fps for the phone request; the DPR 2 request returned 393×852 rather than 786×1704. Host load rose from 8.46/10.95/17.72 to 18.79/13.76/18.12.scripts/verify fastpassed on the scoped retry; its full output will be included with the final update.Step complete: committed the owner report as
2172c019b0. It compares Chromium CDP, extension tab capture, headful D200 capture and Firefox BiDi; records input/audio/file/clipboard and session behavior; documents profile/network isolation, the D198 canvas plugin shape, project licenses and owner grill questions. The report recommends the D200 capture path while leaving engine, display and key decisions to the owner. The final scopedscripts/verify fastrun passed; its output follows in the finish comment.Finished browser-window research.
Head SHA:
2172c019b0Commits:
70cfd594(CDP spike and evidence),2172c019(owner report)Worktree status: clean
Gate:
scripts/verify fastpassed (exit 0). The command ran in a user scope with CPUWeight=10000,CARGO_TARGET_DIRunder job scratch, and a temporary symlink for the repository's pinned Zig wrapper; that symlink has been removed.Gate output follows verbatim:
Parked by owner decision D207: app windows already open on a machine (D200 pipeline) come first; the server-held browser window is explored later. W1–W3 stay open.
kayg referenced this issue2026-10-28 17:53:56 +00:00