6a25c312c7
Chunked prefill was skipping prepared CP HiCache backup entirely while still inserting unfinished valid-tail radix state. That combination caused middle chunks to miss reusable host cache and repeatedly hit stale-tail split fallback paths.\n\nThis keeps CP HiCache page-granular: middle chunks now reserve/write only completed pages, and unfinished radix inserts expose only page-complete prefixes while preserving the request-owned sub-page tail in prefix_indices for later chunks.\n\nConstraint: CP HiCache radix and host residency are managed at page granularity, but chunked prefill can end on a sub-page tail.\nRejected: Continue skipping chunked backup | loses middle-chunk reuse and triggers fallback storms.\nRejected: Insert sub-page chunk tails into CP HiCache | creates stale-tail prune/split conflicts against request-owned KV.\nConfidence: medium\nScope-risk: moderate\nDirective: Do not reintroduce chunked_req backup skip; keep CP HiCache chunked inserts page-complete unless the radix/host cache contract becomes sub-page aware.\nTested: python -m py_compile python/sglang/srt/mem_cache/radix_cache.py python/sglang/srt/mem_cache/hiradix_cache.py test/registered/unit/mem_cache/test_cp_hicache_metadata.py\nTested: g0034 targeted chunked CP HiCache regression tests, 2 passed\nTested: g0034 PYTHONPATH=python python -m pytest -q test/registered/unit/mem_cache/test_cp_hicache_metadata.py, 107 passed\nNot-tested: Fresh chunked-prefill ETE traffic run after process restart
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.