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docs(gpu): #1050 the skip-log check catches every GPU skip and logs to a private directory

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The check grepped for "no GPU adapter" only, so the ctx unit tests' "no
GPU device" skips (and nn's "no GPU runner here") went unseen. It now
lists every "need":"gpu" line except the expected device-loss one. On
the 2026-10-30 lavapipe logs it shows all 24 GPU skips without the
opt-in (the old grep showed 21) and nothing with it.

The log goes in a new mktemp -d directory instead of a fixed /tmp name
another local user could plant a symlink at.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chad Elliott
2026-10-31 22:26:51 -05:00
co-authored by Claude Opus 5.5
parent 21a7d64d46
commit 15bacc7660
1 changed files with 3 additions and 3 deletions
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docs/gpu-pipeline.md
+3 -3
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@@ -280,9 +280,9 @@ machine without a hardware GPU (a VM, a container) every GPU test skips.
`LIGHTCRAFT_GPU_ALLOW_SOFTWARE=1` lets them through for one run (tests only: the app never sets it):
```sh
rm -f /tmp/gpu-skips.jsonl # the log is appended to; an absolute path, as tests run in crates/gpu
LIGHTCRAFT_GPU_ALLOW_SOFTWARE=1 LIGHTCRAFT_SKIP_LOG=/tmp/gpu-skips.jsonl cargo test -p lightcraft-gpu --tests
grep '"reason":"no GPU adapter' /tmp/gpu-skips.jsonl # no output: nothing skipped for want of an adapter
log="$(mktemp -d)/gpu-skips.jsonl" # a new private directory; an absolute path, as tests run in crates/gpu
LIGHTCRAFT_GPU_ALLOW_SOFTWARE=1 LIGHTCRAFT_SKIP_LOG="$log" cargo test -p lightcraft-gpu --tests
grep '"need":"gpu"' "$log" | grep -v 'lost on purpose' # no output: no GPU test skipped but the device-loss one
```
- **Linux:** Mesa's lavapipe (Vulkan; `mesa-vulkan-drivers` on Debian and Ubuntu). Its storage