node_has_undrained_write_ack scanned ack_write_queue on every reservation, including the per-request-per-chunk prepare path whose node ids are freshly minted and can never be queued. Track the max node id ever appended to the queue: any queued id is <= max by construction (no monotonicity assumption needed for correctness), so fresh ids exit on one integer compare and the scan remains only for re-reservations of old ids (the rare write_backup fallback). All three ack_write_queue append sites now go through a single _append_write_ack funnel that maintains the max — the zero-owned-rank and non-CP write acks previously would have bypassed it, allowing false negatives on ranks owning no pages of a node. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Registered Tests
Tests under this directory are auto-discovered by run_suite.py via CI registration decorators.
Where Should I Put My New Test?
No server / engine launch required
| What you're testing | Directory | Requires |
|---|---|---|
| Component logic in isolation (cache, scheduler, config, parser, etc.) | unit/<module>/ |
CPU or GPU |
| CUDA kernel correctness | kernels/ |
GPU |
Server / engine launch required (E2E)
| What you're testing | Directory | Requires |
|---|---|---|
| Model inference correctness | models/, 4-gpu-models/, 8-gpu-models/ |
GPU |
| Feature-specific (OpenAI API, LoRA, speculative, distributed, VLM, etc.) | openai_server/, lora/, spec/, distributed/, ... |
GPU |
| Benchmarks (performance, accuracy, stress) | benchmark/ |
GPU |
| Platform-specific | amd/, ascend/ |
Vendor GPU |
See unit/README.md for unit test conventions.