6517401f01
Every path-gated workflow begins with one small job -- `does this change touch
it`, or `which workspaces this change touches` for the standards build -- that
all of its real jobs declare in `needs`. All 55 of those gate jobs ran on
`linux-arm64`.
That is the one label the fleet cannot spare. Sampled while 267 runs were
queued, every waiting run had the same shape:
[waiting] linux-arm64 does this change touch it
[blocked] linux member · dataflow device, simulated
[blocked] macos member · dataflow device absent
237 runs, each holding a gate in the longest queue, and every real job blocked
behind it. Not only `linux` jobs: `macos`, `linux-hw`, `linux-arm64-hw` and
`macos-m3-ultra` jobs were blocked too. The measured effect was `linux-arm64`
263 deep against `linux` **zero**, with jetson-hub's 20 cores taking no job for
a full hour -- starved not for want of work but because the work could not be
unblocked. A gate waiting on the resource it is rationing is head-of-line
blocking, and it makes every other runner in the fleet idle on its behalf.
The gates move to `linux`. Nothing else changes: the diff is 55 `runs-on` lines
and no others, and every touched file still parses.
Why `linux` and not elsewhere. The gate is not free -- it compares
`BASE...HEAD`, which needs the merge base, so `fetch-depth: 0` is a full clone
rather than a ten-second script. `macos` is served by hosts on a Mac Studio
sitting at load 185; `linux` is a separate 20-core box that was measurably
empty. This moves a serialisation point to the least contended label; it does
not remove it, and the gate is still a single point of failure for its
workflow. The structural fix is an early-exit first step inside each job, which
costs one checkout per leg and is a larger change.
Follow-up, deliberately not bundled: jetson-hub runs at capacity 2 with 15 GB of
RAM, so 55 clones still serialise two at a time. Raising capacity helps gates
and hurts the heavy emulated-architecture jobs that share the label, so it wants
measuring on its own.
Co-Authored-By: Claude Opus 5 <[email protected]>
81 lines
2.8 KiB
YAML
81 lines
2.8 KiB
YAML
name: wai-quantum for JavaScript
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# The npm package @transaction-science/wai-quantum (wai/wai-quantum-js): the job
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# service's engine for WebAssembly (wai-web, feature quantum_engine) with its
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# bindings. ci/check.sh builds and packs it; the tarball, unpacked, holds the
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# package's allow-list and nothing else; the smoke test runs against what was
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# unpacked (a job run with a fresh key and its receipt verified, a forged result
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# refused, a program linted and drawn, a refusal with its diagnostic code); and the
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# tarball installed into an empty app runs the README's Node example by name.
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# Nothing is published.
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concurrency:
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group: ${{ github.workflow }}-${{ github.ref }}
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cancel-in-progress: true
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on:
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push:
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branches: [main]
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paths:
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- 'wai/wai-quantum-js/**'
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- 'wai/wai-web/**'
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- 'wai/wai-quantum/**'
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- 'wai/wai-rs/**'
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- 'rust-toolchain.toml'
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- '.github/workflows/wai-quantum-js.yml'
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pull_request:
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paths:
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- 'wai/wai-quantum-js/**'
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- 'wai/wai-web/**'
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- 'wai/wai-quantum/**'
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- 'wai/wai-rs/**'
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- 'rust-toolchain.toml'
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- '.github/workflows/wai-quantum-js.yml'
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jobs:
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relevant:
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name: does this change touch it
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runs-on: linux
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outputs:
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run: ${{ steps.gate.outputs.run }}
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steps:
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- uses: actions/checkout@v5
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with:
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fetch-depth: 0
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- id: gate
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run: |
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set -euo pipefail
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r=$(python3 scripts/pr-touches-paths.py .github/workflows/wai-quantum-js.yml \
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"${{ github.event.pull_request.base.sha }}" \
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"${{ github.event.pull_request.head.sha }}")
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echo "this change touches the npm package: $r"
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echo "run=$r" >> "$GITHUB_OUTPUT"
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js-linux:
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name: javascript · linux
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needs: relevant
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if: needs.relevant.outputs.run == 'true'
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runs-on: linux
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timeout-minutes: 60
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steps:
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- uses: actions/checkout@v5
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- name: Install Rust 1.98.0 with the wasm32 target
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shell: bash
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run: |
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export PATH="$HOME/.cargo/bin:$PATH"
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command -v rustup >/dev/null 2>&1 || \
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curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain 1.98.0
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rustup toolchain install 1.98.0 --profile minimal
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rustup default 1.98.0
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rustup target add wasm32-unknown-unknown
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echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
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# Pinned to the wasm-bindgen version in wai-web/Cargo.lock; build.sh refuses another.
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- name: wasm-bindgen CLI 0.2.127
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shell: bash
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run: cargo install --locked wasm-bindgen-cli --version 0.2.127
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- uses: actions/setup-node@v4
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with:
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node-version: '22'
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- name: Build, pack, unpack, smoke-test and install the package
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shell: bash
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run: bash wai/wai-quantum-js/ci/check.sh "$RUNNER_TEMP/npm"
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