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windows: add swap + lower job count to survive rustc OOM on CI #84

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Merged
mdheller merged 1 commit into from
Jul 23, 2026
Merged

windows: add swap + lower job count to survive rustc OOM on CI #84

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12 changes: 12 additions & 0 deletions .github/workflows/nightly-windows.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,8 @@ jobs:
VERSION: 150.0.1
RELEASE: 1
PROFILE: human-secure
# 16GB runners OOM the neqo/mls/icu rustc cluster at higher parallelism.
MOZ_BUILD_JOBS: 3

steps:
- name: Checkout
Expand All @@ -41,6 +43,16 @@ jobs:
/opt/hostedtoolcache/CodeQL /usr/local/share/boost "$AGENT_TOOLSDIRECTORY" || true
df -h /

- name: Add swap (absorb rustc memory spikes on 16GB runners)
run: |
sudo swapoff -a || true
sudo rm -f /mnt/swapfile /swapfile || true
sudo fallocate -l 14G /mnt/swapfile
sudo chmod 600 /mnt/swapfile
sudo mkswap /mnt/swapfile
sudo swapon /mnt/swapfile
free -h

- name: Cache Mozilla toolchain (clang-cl, cbindgen)
uses: actions/cache@v4
with:
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9 changes: 5 additions & 4 deletions scripts/build-windows-cross.sh
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Expand Up @@ -157,10 +157,11 @@ export PATH="$MOZ_CLANG_BIN:$HOME/.cargo/bin:$PATH"
ulimit -n "$NOFILE"

./mach configure
# Cap parallelism at the core count: mach's memory heuristic over-parallelizes
# on 16GB CI runners and a burst of rustc processes gets the job SIGTERM'd
# (exit 143, ~10min in). -j$(nproc) is also correct on the big sovereign builder.
./mach build -j"$(nproc)"
# Cap parallelism: mach's memory heuristic over-parallelizes on 16GB CI runners
# and a burst of multi-GB rustc processes (neqo/mls/icu) gets OOM-killed (exit
# 143, ~10min in). MOZ_BUILD_JOBS lets CI dial it down (the workflow sets a low
# value + adds swap); defaults to nproc for the 32-core sovereign builder.
./mach build -j"${MOZ_BUILD_JOBS:-$(nproc)}"
./mach package

log "artifacts"
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