2a9dfcca6f
Async MLA/index prefetch is a scheduling optimization, not the correctness contract for target current reuse. Tiny cache-hit suffixes can skip async prefetcher creation while target partial-current reuse still composes page-slot prefix materialization with current KV rows synchronously. CP HiCache radix/device accounting now treats retained valid-tail pages as physical page spans so allocator state stays consistent when logical cache keys are shorter than the retained page. Constraint: CP shared KV ownership and HiCache residency are page-granular while request-visible cache lengths remain valid-token lengths. Constraint: Async prefetch can hang or regress on large-prefix tiny-extend traffic and must not be required for current reuse. Rejected: Treat missing prefetcher as fail-fast for target partial-current reuse | disabled useful current reuse and broke tiny-prefix/tiny-suffix traffic. Rejected: Keep async prefetcher object with synchronous consume mode | conflates prefetch object existence with current-layer correctness and hides fallback semantics. Confidence: medium Scope-risk: moderate Directive: Do not make current-only or target partial-current reuse depend on MLA/index prefetcher creation; prefetcher objects mean async next-layer work exists. Tested: Remote g0034 container py_compile for touched modules. Tested: Remote g0034 PYTHONPATH=python python -m pytest -q test/registered/unit/mem_cache/test_cp_shared_kv_runtime.py -> 73 passed. Tested: Remote g0034 PYTHONPATH=python python -m pytest -q test/registered/unit/mem_cache/test_cp_hicache_metadata.py -> 90 passed. Not-tested: Latest full ETE traffic run with GLM-5.1 CP HiCache after this commit. Not-tested: CUDA kernel-level performance impact of synchronous no-prefetch partial-current compose.
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.