leaveletandClaude Opus 4.7
1d630def95
In CP=8 + NSA-shared-KV + HiCache disagg-prefill, cache-hit prefill produced incoherent decode output. Cold prefill on CP was correct; pure CP without HiCache was correct. The bug lived at the HiCache load_cp / device-alloc interface. Root cause: cache_controller.load_cp called the plain mem_pool_device_allocator.alloc(logical_len), which returns logical pages with no CP owner-pattern preservation. Cold prefill instead uses alloc_extend_compute_owner with a zigzag owner pattern from build_in_seq_page_compute_owners. The saved CpHiCacheNodeMetadata.owned_positions records WHICH POSITIONS in the write-time alloc were owned by this rank. At load time, those same positions are applied to a new alloc whose per-position owner pattern is arbitrary -- each rank loads its host bytes into physical slots whose corresponding logical page is owned by a DIFFERENT rank. Attention's materialize_shared_token_kv_buffer reads from the owner's physical slot, which was never loaded. Result: garbage. Fix: - CpHiCacheNodeMetadata gains two required fields: page_owners (int8 per logical page, identical on all CP ranks) and page_size. __post_init__ validates; split() bisects page_owners by page index with a page-alignment check. - _write_cp derives page_owners from device_indices (page-first slot of each page -> logical page id -> layout.owner_for_logical_pages) and stores in both metadata-construction sites (zero-owned and normal). - New CPSharedPagedTokenToKVPoolAllocator.alloc_pages_with_owners() reuses _select_compute_owner_pages (with its tai-kernel fast path) and returns page-contiguous token locs whose per-page owner sequence equals the input. - load_cp now concats page_owners across nodes_to_load and calls alloc_pages_with_owners. On None (lane exhausted) the caller hits the retry-with-eviction path; further failure returns None and degrades to cache miss. No silent fallback to plain alloc -- that recreated the bug. - load_back retry path now calls _evict_for_compute_owner_lanes (module-top import) instead of plain evict(); this targets the deficit lane and gives the next alloc attempt a chance to satisfy it. - envs import moved to module top in cache_controller.py per code-review feedback. Removed an over-defensive owned_check.all().item() in load_cp that would have re-introduced the host-sync anti-pattern 97a9f850c removed -- the invariant is already guaranteed by alloc_pages_with_owners. Tests: 40 existing CpHiCacheNodeMetadata constructions migrated to pass the new required fields. 9 new metadata tests (validators + split page-alignment). 10 new allocator tests in test_alloc_pages_with_owners.py covering input-order preservation, lane exhaustion, release_pages fallback, debug-mode invariant. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
562 lines
22 KiB
Python
562 lines
22 KiB
Python
import sys
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import types
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from unittest import main
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from unittest.mock import patch
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import torch
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try:
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import sgl_kernel # noqa: F401
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import sgl_kernel.kvcacheio # noqa: F401
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except (ImportError, RuntimeError):
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if "sgl_kernel" not in sys.modules:
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sys.modules["sgl_kernel"] = types.ModuleType("sgl_kernel")
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sys.modules["sgl_kernel"].__file__ = "sgl_kernel_stub.py"
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sys.modules["sgl_kernel"].__path__ = []
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if not hasattr(sys.modules["sgl_kernel"], "__getattr__"):
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def _sgl_kernel_getattr(name):
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if name.startswith("__"):
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raise AttributeError(name)
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fn = lambda *args, **kwargs: None
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setattr(sys.modules["sgl_kernel"], name, fn)
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return fn
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sys.modules["sgl_kernel"].__getattr__ = _sgl_kernel_getattr
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if "sgl_kernel.quantization" not in sys.modules:
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quantization_stub = types.ModuleType("sgl_kernel.quantization")
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quantization_stub.__file__ = "sgl_kernel_quantization_stub.py"
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def _quantization_getattr(name):
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if name.startswith("__"):
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raise AttributeError(name)
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fn = lambda *args, **kwargs: None
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setattr(quantization_stub, name, fn)
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return fn
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quantization_stub.__getattr__ = _quantization_getattr
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for name in (
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"ggml_dequantize",
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"ggml_moe_a8",
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"ggml_moe_a8_vec",
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"ggml_moe_get_block_size",
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"ggml_mul_mat_a8",
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"ggml_mul_mat_vec_a8",
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):
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setattr(quantization_stub, name, lambda *args, **kwargs: None)
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sys.modules["sgl_kernel.quantization"] = quantization_stub
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for name in (
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"sgl_per_token_group_quant_8bit",
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"sgl_per_token_group_quant_fp8",
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"sgl_per_token_quant_fp8",
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"fp8_blockwise_scaled_mm",
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"fp8_scaled_mm",
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"silu_and_mul",
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):
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if not hasattr(sys.modules["sgl_kernel"], name):
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setattr(sys.modules["sgl_kernel"], name, lambda *args, **kwargs: None)
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_sgl_kernel_lib = torch.library.Library("sgl_kernel", "FRAGMENT")
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for _schema in (
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"sgl_per_token_group_quant_8bit(Tensor input, Tensor(a!) output_q, Tensor(b!) output_s, int group_size, float eps, float fp8_min, float fp8_max, bool scale_ue8m0) -> ()",
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"sgl_per_token_group_quant_fp8(Tensor input, Tensor(a!) output_q, Tensor(b!) output_s, int group_size, float eps, float fp8_min, float fp8_max, bool scale_ue8m0) -> ()",
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"sgl_per_token_quant_fp8(Tensor input, Tensor(a!) output_q, Tensor(b!) output_s) -> ()",
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"fp8_scaled_mm(Tensor mat_a, Tensor mat_b, Tensor scales_a, Tensor scales_b, ScalarType out_dtype, Tensor? bias=None) -> Tensor",
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"fp8_blockwise_scaled_mm(Tensor mat_a, Tensor mat_b, Tensor scales_a, Tensor scales_b, ScalarType out_dtype) -> Tensor",
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):
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try:
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_sgl_kernel_lib.define(_schema)
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except RuntimeError as exc:
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if (
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"already" not in str(exc).lower()
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and "duplicate" not in str(exc).lower()
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):
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raise
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if "sgl_kernel.kvcacheio" not in sys.modules:
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kvcacheio_stub = types.ModuleType("sgl_kernel.kvcacheio")
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for name in (
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"transfer_kv_all_layer",
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"transfer_kv_all_layer_direct_lf_pf",
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"transfer_kv_all_layer_lf_pf",
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"transfer_kv_all_layer_lf_ph",
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"transfer_kv_all_layer_mla",
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"transfer_kv_all_layer_mla_lf_pf",
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"transfer_kv_direct",
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"transfer_kv_per_layer",
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"transfer_kv_per_layer_direct_pf_lf",
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"transfer_kv_per_layer_mla",
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"transfer_kv_per_layer_mla_pf_lf",
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"transfer_kv_per_layer_pf_lf",
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"transfer_kv_per_layer_ph_lf",
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):
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setattr(kvcacheio_stub, name, lambda *args, **kwargs: None)
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sys.modules["sgl_kernel.kvcacheio"] = kvcacheio_stub
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from sglang.srt.managers.cache_controller import HiCacheController
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from sglang.srt.mem_cache.cp_shared_kv_layout import CpSharedKVLayout
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from sglang.srt.mem_cache.hiradix_cache import CpHiCacheNodeMetadata
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from sglang.srt.mem_cache.radix_cache import TreeNode
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from sglang.test.ci.ci_register import register_cpu_ci
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from sglang.test.test_utils import CustomTestCase
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register_cpu_ci(est_time=2, suite="stage-a-test-cpu")
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class FakeHostPool:
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def __init__(self, alloc_result):
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self.alloc_result = alloc_result
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self.alloc_calls = []
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self.backups = []
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self.loads = []
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self.frees = []
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self.page_size = 4
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self.layout = "page_first_direct"
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def alloc(self, need_size):
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self.alloc_calls.append(need_size)
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if self.alloc_result is None:
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return None
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return self.alloc_result[:need_size].clone()
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def backup_from_device_all_layer(
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self, device_pool, host_indices, device_indices, io_backend
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):
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self.backups.append((host_indices.clone(), device_indices.clone(), device_pool))
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def load_to_device_per_layer(
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self, device_pool, host_indices, device_indices, layer_id, io_backend
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):
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self.loads.append(
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(host_indices.clone(), device_indices.clone(), layer_id, device_pool)
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)
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def free(self, indices):
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self.frees.append(indices.clone())
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return len(indices)
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class FakeDevicePool:
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device = "cpu"
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layer_num = 1
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def __init__(self, name="target", layer_num=1):
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self.name = name
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self.layer_num = layer_num
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def register_layer_transfer_counter(self, counter):
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self.counter = counter
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class FakeAllocator:
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def __init__(self, alloc_result=None):
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self.alloc_result = alloc_result
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self.alloc_calls = []
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self.frees = []
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self.cp_size = 4
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self.cp_rank = 1
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self.device_pool = FakeDevicePool()
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def get_kvcache(self):
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return self.device_pool
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def alloc(self, need_size):
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self.alloc_calls.append(need_size)
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if self.alloc_result is None:
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return None
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return self.alloc_result[:need_size].clone()
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def free(self, indices):
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self.frees.append(indices.clone())
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return len(indices)
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class HostIndicesTensor(torch.Tensor):
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@staticmethod
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def __new__(cls, data):
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return torch.Tensor._make_subclass(cls, data, require_grad=False)
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def to(self, *args, **kwargs):
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raise AssertionError("load_cp should not move host indices before queuing")
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class DummyEvent:
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def record(self):
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pass
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def wait(self, stream):
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pass
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def query(self):
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return True
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def synchronize(self):
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pass
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class DummyStream:
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc, tb):
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return False
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class DummyDeviceModule:
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Event = DummyEvent
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Stream = DummyStream
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@staticmethod
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def stream(stream):
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return stream
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class DummyLayerDoneCounter:
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def __init__(self):
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self.events = [
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type(
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"ProducerEvent",
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(),
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{
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"start_event": DummyEvent(),
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"finish_event": DummyEvent(),
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"complete": lambda self, layer_id: None,
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},
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)()
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]
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def update_producer(self):
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return 0
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class TestHiCacheControllerCPWrite(CustomTestCase):
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def setUp(self):
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self.device_module_patcher = patch(
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"sglang.srt.managers.cache_controller.device_module",
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DummyDeviceModule,
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)
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self.nsa_pool_patcher = patch(
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"sglang.srt.managers.cache_controller.NSATokenToKVPool",
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FakeDevicePool,
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)
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self.device_module_patcher.start()
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self.nsa_pool_patcher.start()
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self.addCleanup(self.device_module_patcher.stop)
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self.addCleanup(self.nsa_pool_patcher.stop)
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def make_controller(
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self,
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host_pool,
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allocator=None,
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cp_rank=1,
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draft_host_pool=None,
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draft_mem_pool_device=None,
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):
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allocator = allocator or FakeAllocator()
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controller = HiCacheController(
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token_to_kv_pool_allocator=allocator,
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mem_pool_host=host_pool,
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page_size=4,
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tp_group=None,
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load_cache_event=__import__("threading").Event(),
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io_backend="direct",
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cp_shared_kv_layout=CpSharedKVLayout(
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page_size=4, cp_size=4, cp_rank=cp_rank
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),
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draft_mem_pool_host=draft_host_pool,
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draft_mem_pool_device=draft_mem_pool_device,
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)
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controller.layer_done_counter = DummyLayerDoneCounter()
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return controller
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def test_cp_write_filters_to_owned_physical_locs(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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controller = self.make_controller(host_pool, cp_rank=1)
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logical_locs = torch.arange(4, 20, dtype=torch.int64)
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result = controller.write(logical_locs, node_id=7)
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self.assertEqual(result.metadata.logical_len, 16)
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self.assertEqual(result.metadata.owned_positions.tolist(), [4, 5, 6, 7])
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self.assertEqual(result.metadata.host_indices.tolist(), [100, 101, 102, 103])
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self.assertEqual(host_pool.alloc_calls, [4])
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self.assertEqual(host_pool.backups[0][1].tolist(), [4, 5, 6, 7])
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def test_cp_write_rejects_incomplete_owned_physical_page(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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controller = self.make_controller(host_pool, cp_rank=1)
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logical_locs = torch.tensor([8, 9, 10], dtype=torch.int64)
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with self.assertRaisesRegex(
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ValueError, "(host_indices|physical_device_indices).*whole pages"
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):
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controller.write(logical_locs, node_id=21)
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def test_cp_write_rejects_non_contiguous_owned_physical_page(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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controller = self.make_controller(host_pool, cp_rank=1)
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logical_locs = torch.tensor([8, 9, 11, 10], dtype=torch.int64)
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with self.assertRaisesRegex(
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ValueError, "physical_device_indices.*contiguous page spans"
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):
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controller.write(logical_locs, node_id=22)
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def test_cp_write_rejects_non_contiguous_host_page(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 103, 102], dtype=torch.int64))
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controller = self.make_controller(host_pool, cp_rank=1)
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logical_locs = torch.arange(8, 12, dtype=torch.int64)
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with self.assertRaisesRegex(ValueError, "host_indices.*contiguous page spans"):
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controller.write(logical_locs, node_id=23)
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def test_cp_write_zero_owned_returns_metadata_and_noop_ack(self):
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host_pool = FakeHostPool(torch.tensor([], dtype=torch.int64))
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controller = self.make_controller(host_pool, cp_rank=3)
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logical_locs = torch.arange(4, 8, dtype=torch.int64)
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result = controller.write(logical_locs, node_id=8)
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self.assertEqual(result.metadata.logical_len, 4)
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self.assertEqual(result.metadata.host_indices.tolist(), [])
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self.assertEqual(host_pool.alloc_calls, [])
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self.assertEqual(len(controller.ack_write_queue), 1)
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def test_cp_write_allocation_failure_reports_required_host_slots(self):
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host_pool = FakeHostPool(None)
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controller = self.make_controller(host_pool, cp_rank=1)
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logical_locs = torch.arange(4, 20, dtype=torch.int64)
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result = controller.write(logical_locs, node_id=9)
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self.assertEqual(result.required_host_slots, 4)
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def test_cp_write_with_draft_pool_backs_target_and_draft_locs(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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draft_host_pool = FakeHostPool(
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torch.tensor([200, 201, 202, 203], dtype=torch.int64)
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)
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draft_device_pool = FakeDevicePool("draft")
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controller = self.make_controller(
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host_pool,
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cp_rank=1,
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draft_host_pool=draft_host_pool,
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draft_mem_pool_device=draft_device_pool,
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)
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logical_locs = torch.arange(4, 20, dtype=torch.int64)
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result = controller.write(logical_locs, node_id=77)
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self.assertEqual(result.metadata.host_indices.tolist(), [100, 101, 102, 103])
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self.assertEqual(
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result.metadata.draft_host_indices.tolist(), [200, 201, 202, 203]
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)
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self.assertEqual(host_pool.alloc_calls, [4])
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self.assertEqual(draft_host_pool.alloc_calls, [4])
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self.assertEqual(host_pool.backups[0][1].tolist(), [4, 5, 6, 7])
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self.assertEqual(draft_host_pool.backups[0][1].tolist(), [4, 5, 6, 7])
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self.assertIs(draft_host_pool.backups[0][2], draft_device_pool)
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self.assertEqual(len(controller.ack_write_queue), 1)
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self.assertEqual(controller.ack_write_queue[0].node_ids, [77])
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def test_cp_write_draft_allocation_failure_rolls_back_target_host(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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draft_host_pool = FakeHostPool(None)
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controller = self.make_controller(
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host_pool,
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cp_rank=1,
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draft_host_pool=draft_host_pool,
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draft_mem_pool_device=FakeDevicePool("draft"),
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)
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logical_locs = torch.arange(4, 20, dtype=torch.int64)
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result = controller.write(logical_locs, node_id=78)
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self.assertIsNone(result.metadata)
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self.assertEqual(result.required_host_slots, 4)
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self.assertEqual(host_pool.frees[0].tolist(), [100, 101, 102, 103])
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self.assertEqual(host_pool.backups, [])
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self.assertEqual(draft_host_pool.backups, [])
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def test_generate_storage_config_constructs_config_at_runtime(self):
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controller = HiCacheController.__new__(HiCacheController)
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controller.mem_pool_device = FakeDevicePool()
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controller.mem_pool_host = FakeHostPool(torch.tensor([], dtype=torch.int64))
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controller.pp_rank = 1
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controller.pp_size = 2
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controller.enable_storage_metrics = True
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with patch(
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"sglang.srt.managers.cache_controller.is_dp_attention_enabled",
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return_value=False,
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), patch(
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"sglang.srt.managers.cache_controller.get_tensor_model_parallel_rank",
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return_value=3,
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), patch(
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"sglang.srt.managers.cache_controller.get_tensor_model_parallel_world_size",
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return_value=4,
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):
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config = controller._generate_storage_config(
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model_name="test-model",
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storage_backend_extra_config={"tp_lcm_size": 8},
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)
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self.assertEqual(config.tp_rank, 3)
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self.assertEqual(config.tp_size, 4)
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self.assertEqual(config.pp_rank, 1)
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self.assertEqual(config.pp_size, 2)
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self.assertEqual(config.model_name, "test-model")
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self.assertEqual(config.tp_lcm_size, 8)
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def test_attach_storage_backend_rejects_cp_hicache(self):
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host_pool = FakeHostPool(torch.tensor([], dtype=torch.int64))
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controller = self.make_controller(host_pool)
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with self.assertRaisesRegex(RuntimeError, "CP shared KV.*storage backend"):
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controller.attach_storage_backend("mooncake")
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class TestHiCacheControllerCPLoad(TestHiCacheControllerCPWrite):
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def test_cp_load_allocates_full_logical_locs_and_transfers_owned_physical_locs(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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allocator = FakeAllocator(alloc_result=torch.arange(64, 80, dtype=torch.int64))
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controller = self.make_controller(host_pool, allocator=allocator, cp_rank=1)
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node = TreeNode()
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node.host_len = 16
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node.cp_hicache = CpHiCacheNodeMetadata(
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logical_len=16,
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owned_positions=torch.tensor([4, 5, 6, 7], dtype=torch.int64),
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host_indices=torch.tensor([100, 101, 102, 103], dtype=torch.int64),
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page_owners=torch.zeros(max(16, 0), dtype=torch.int8),
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page_size=1,
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)
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device_indices = controller.load_cp([node], node_id=11)
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controller.start_loading()
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self.assertEqual(device_indices.tolist(), list(range(64, 80)))
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self.assertEqual(allocator.alloc_calls, [16])
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self.assertEqual(host_pool.loads[0][1].tolist(), [20, 21, 22, 23])
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def test_cp_load_with_draft_pool_restores_target_and_draft_locs(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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draft_host_pool = FakeHostPool(
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torch.tensor([200, 201, 202, 203], dtype=torch.int64)
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)
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draft_device_pool = FakeDevicePool("draft")
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allocator = FakeAllocator(alloc_result=torch.arange(64, 80, dtype=torch.int64))
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controller = self.make_controller(
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host_pool,
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allocator=allocator,
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cp_rank=1,
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draft_host_pool=draft_host_pool,
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draft_mem_pool_device=draft_device_pool,
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)
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node = TreeNode()
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node.host_len = 16
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node.cp_hicache = CpHiCacheNodeMetadata(
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logical_len=16,
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owned_positions=torch.tensor([4, 5, 6, 7], dtype=torch.int64),
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host_indices=torch.tensor([100, 101, 102, 103], dtype=torch.int64),
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draft_host_indices=torch.tensor([200, 201, 202, 203], dtype=torch.int64),
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page_owners=torch.zeros(max(16, 0), dtype=torch.int8),
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page_size=1,
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)
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device_indices = controller.load_cp([node], node_id=14)
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controller.start_loading()
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self.assertEqual(device_indices.tolist(), list(range(64, 80)))
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self.assertEqual(host_pool.loads[0][1].tolist(), [20, 21, 22, 23])
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self.assertEqual(draft_host_pool.loads[0][1].tolist(), [20, 21, 22, 23])
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self.assertIs(draft_host_pool.loads[0][3], draft_device_pool)
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self.assertEqual(len(controller.ack_load_queue), 1)
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self.assertEqual(controller.ack_load_queue[0].node_ids, [14])
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def test_cp_load_zero_owned_returns_full_logical_locs_and_noop_ack(self):
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host_pool = FakeHostPool(torch.tensor([], dtype=torch.int64))
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allocator = FakeAllocator(alloc_result=torch.arange(64, 68, dtype=torch.int64))
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controller = self.make_controller(host_pool, allocator=allocator, cp_rank=3)
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node = TreeNode()
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node.host_len = 4
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node.cp_hicache = CpHiCacheNodeMetadata(
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logical_len=4,
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owned_positions=torch.empty((0,), dtype=torch.int64),
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host_indices=torch.empty((0,), dtype=torch.int64),
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page_owners=torch.zeros(max(4, 0), dtype=torch.int8),
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page_size=1,
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)
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device_indices = controller.load_cp([node], node_id=12)
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controller.start_loading()
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self.assertEqual(device_indices.tolist(), [64, 65, 66, 67])
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self.assertEqual(host_pool.loads, [])
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self.assertEqual(len(controller.ack_load_queue), 1)
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def test_cp_load_queues_cpu_host_indices_before_backend_moves(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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allocator = FakeAllocator(alloc_result=torch.arange(64, 80, dtype=torch.int64))
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controller = self.make_controller(host_pool, allocator=allocator, cp_rank=1)
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host_indices = HostIndicesTensor(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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node = TreeNode()
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node.host_len = 16
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node.cp_hicache = type(
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"CpHiCacheMetadataStub",
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(),
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{
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"owned_positions": torch.tensor([4, 5, 6, 7], dtype=torch.int64),
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"host_indices": host_indices,
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},
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)()
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controller.load_cp([node], node_id=13)
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queued_op = controller.load_queue[0]
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self.assertEqual(queued_op.host_indices.device.type, "cpu")
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self.assertEqual(queued_op.host_indices.tolist(), [100, 101, 102, 103])
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self.assertEqual(queued_op.device_indices.tolist(), [20, 21, 22, 23])
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def test_cp_load_rejects_non_contiguous_physical_device_page(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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allocator = FakeAllocator(
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alloc_result=torch.tensor(
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[64, 65, 66, 67, 68, 69, 71, 70, 72, 73, 74, 75, 76, 77, 78, 79],
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dtype=torch.int64,
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)
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)
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controller = self.make_controller(host_pool, allocator=allocator, cp_rank=1)
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node = TreeNode()
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node.host_len = 16
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node.cp_hicache = CpHiCacheNodeMetadata(
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logical_len=16,
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owned_positions=torch.tensor([4, 5, 6, 7], dtype=torch.int64),
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host_indices=torch.tensor([100, 101, 102, 103], dtype=torch.int64),
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page_owners=torch.zeros(max(16, 0), dtype=torch.int8),
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page_size=1,
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)
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with self.assertRaisesRegex(
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ValueError, "physical_device_indices.*contiguous page spans"
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):
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controller.load_cp([node], node_id=31)
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def test_cp_load_rejects_non_contiguous_host_page(self):
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host_pool = FakeHostPool(torch.tensor([100, 101, 102, 103], dtype=torch.int64))
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allocator = FakeAllocator(alloc_result=torch.arange(64, 80, dtype=torch.int64))
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controller = self.make_controller(host_pool, allocator=allocator, cp_rank=1)
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node = TreeNode()
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node.host_len = 16
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node.cp_hicache = CpHiCacheNodeMetadata(
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logical_len=16,
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owned_positions=torch.tensor([4, 5, 6, 7], dtype=torch.int64),
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host_indices=torch.tensor([100, 101, 103, 102], dtype=torch.int64),
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page_owners=torch.zeros(max(16, 0), dtype=torch.int8),
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page_size=1,
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)
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with self.assertRaisesRegex(ValueError, "host_indices.*contiguous page spans"):
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controller.load_cp([node], node_id=32)
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if __name__ == "__main__":
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main()
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