d015e3fb01
Phase 2 shared KV keeps persistent KV/index sharded across CP ranks but uses a full-view compatibility layer before NSA topk and MLA attention. For current-only prefill chunks, the current KV/index tensors have already been CP all-gathered and reranged before being written to the sharded persistent pool. This change adds a guarded current-reuse path that remaps logical current locs to compact tensor rows and skips the shared-KV materialize path for current-only MLA and NSA indexer reads. Constraint: Existing NSA/MLA kernels still consume full-view/compact page tables; history and mixed current/history batches must keep the Phase 2 fallback. Rejected: Make all history attention shard-aware in this patch | that requires global topk merge and distributed sparse attention and belongs to a later phase. Confidence: medium Scope-risk: moderate Reversibility: clean Directive: Do not remove the Phase 2 fallback until mixed/history shared-KV paths have correctness and performance coverage. Tested: python -m py_compile on modified Python files Tested: git diff --check on staged modified files Not-tested: local pytest collection is blocked by missing pybase64 in this environment. Not-tested: full long-context chunked prefill/decode performance in this commit step.
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.