1243 lines
43 KiB
Python
1243 lines
43 KiB
Python
"""
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Hybrid CPU-GPU KV cache manager with CUDA Graph support.
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Key design for CUDA Graph compatibility:
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1. GPU buffer has fixed addresses (allocated once)
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2. CPU pool has fixed addresses (pinned memory)
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3. gather_indices tensor has fixed address, variable content
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4. H2D transfer uses gathered_copy kernel inside CUDA graphs
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5. Graph replay only needs index updates (tiny overhead)
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"""
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import logging
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from collections import deque
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from dataclasses import dataclass, field
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from enum import Enum, auto
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from typing import List, Tuple, Dict, Set, Optional
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import torch
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from torch import Tensor
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logger = logging.getLogger(__name__)
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from nanovllm.engine.sequence import Sequence
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from nanovllm.kvcache.base_manager import KVCacheManager
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from nanovllm.kvcache.offload_engine import OffloadEngine
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from nanovllm.kvcache.policies.base_policy import EvictionPolicy
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from nanovllm.kvcache.policies.lru_policy import LRUPolicy
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class BlockLocation(Enum):
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"""Where a logical block's data currently resides."""
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GPU = auto()
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CPU = auto()
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INVALID = auto() # Not yet written / deallocated
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@dataclass
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class LogicalBlock:
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"""
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Logical block that can be mapped to GPU or CPU physical storage.
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Sequences reference logical blocks. Physical blocks are the actual
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storage locations (GPU slots or CPU blocks).
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"""
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logical_id: int
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location: BlockLocation = BlockLocation.INVALID
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gpu_slot: int = -1 # GPU buffer slot ID (if on GPU)
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cpu_block_id: int = -1 # CPU pool block ID (if on CPU)
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ref_count: int = 0
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hash: int = -1
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token_ids: List[int] = field(default_factory=list)
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def reset(self):
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self.location = BlockLocation.INVALID
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self.gpu_slot = -1
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self.cpu_block_id = -1
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self.ref_count = 0
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self.hash = -1
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self.token_ids = []
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class HybridKVCacheManager(KVCacheManager):
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"""
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Hybrid CPU-GPU KV cache manager with CUDA Graph support.
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Architecture:
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- GPU buffer: Fixed-size working set (num_gpu_slots)
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- CPU pool: Overflow storage (num_cpu_blocks)
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- Logical blocks: What sequences reference (num_gpu_slots + num_cpu_blocks)
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CUDA Graph compatibility:
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- All tensor addresses fixed at init time
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- prepare_for_attention() updates gather_indices (outside graph)
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- gathered_h2d_layer() executes transfer (inside graph)
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Strategy:
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1. New KV data written to GPU slots
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2. Cold blocks evicted to CPU using configurable policy
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3. Needed blocks prefetched back to GPU before attention
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"""
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def __init__(
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self,
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num_gpu_slots: int,
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num_cpu_blocks: int,
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block_size: int,
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policy: Optional[EvictionPolicy] = None,
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cpu_primary: bool = True,
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num_prefetch_blocks: int = 2,
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):
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"""
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Initialize hybrid manager.
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Args:
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num_gpu_slots: Number of GPU buffer slots (working set)
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num_cpu_blocks: Number of CPU pool blocks (overflow or primary storage)
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block_size: Tokens per block
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policy: Eviction policy (default: LRU)
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cpu_primary: If True, use CPU as primary storage with ring buffer GPU design.
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If False, use GPU as primary with CPU as overflow (legacy mode).
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num_prefetch_blocks: Number of blocks for ring buffer pipeline (deprecated, ring_slots = num_gpu_slots)
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"""
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self._block_size = block_size
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self.num_gpu_slots = num_gpu_slots
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self.num_cpu_blocks = num_cpu_blocks
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self.total_blocks = num_gpu_slots + num_cpu_blocks
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self.cpu_primary = cpu_primary # Ring buffer mode flag
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self.num_prefetch_blocks = num_prefetch_blocks # Ring buffer design parameter (deprecated)
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# Eviction policy
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self.policy = policy or LRUPolicy()
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# Logical blocks (what sequences reference)
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self.logical_blocks: List[LogicalBlock] = [
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LogicalBlock(i) for i in range(self.total_blocks)
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]
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self.free_logical_ids: deque[int] = deque(range(self.total_blocks))
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# GPU slot management (slots are fixed, mapping is variable)
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self.free_gpu_slots: deque[int] = deque(range(num_gpu_slots))
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self.gpu_slot_to_logical: Dict[int, int] = {} # gpu_slot -> logical_id
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# CPU block management
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self.free_cpu_blocks: deque[int] = deque(range(num_cpu_blocks))
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self.cpu_block_to_logical: Dict[int, int] = {} # cpu_block -> logical_id
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# Prefix cache (uses logical block IDs)
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self.hash_to_logical_id: Dict[int, int] = {}
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# Step counter for policy
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self.current_step = 0
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# Offload engine (set by allocate_cache)
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self.offload_engine: Optional[OffloadEngine] = None
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# Track blocks pending GPU load (for decode graph)
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self.pending_gpu_loads: Set[int] = set() # logical_ids
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# Track blocks that have been prefilled (KV written) for chunked prefill
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self.prefilled_blocks: Set[int] = set() # logical_ids
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# Track decode starting position within block (for batched offload optimization)
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# Key: sequence id, Value: starting position where decode began in current block
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self._decode_start_pos: Dict[int, int] = {}
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@property
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def block_size(self) -> int:
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return self._block_size
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@property
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def num_free_blocks(self) -> int:
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return len(self.free_logical_ids)
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def allocate_cache(
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self,
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num_layers: int,
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num_kv_heads: int,
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head_dim: int,
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dtype: torch.dtype,
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) -> None:
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"""Initialize the offload engine with actual cache storage."""
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self.offload_engine = OffloadEngine(
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num_layers=num_layers,
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num_gpu_blocks=self.num_gpu_slots,
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num_cpu_blocks=self.num_cpu_blocks,
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block_size=self._block_size,
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num_kv_heads=num_kv_heads,
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head_dim=head_dim,
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dtype=dtype,
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num_prefetch_blocks=self.num_prefetch_blocks,
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)
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def get_layer_cache(self, layer_id: int) -> Tuple[Tensor, Tensor]:
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"""Get GPU K/V cache tensors for a layer."""
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assert self.offload_engine is not None
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return self.offload_engine.get_layer_cache(layer_id)
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def _allocate_gpu_slot(self, protected_logical_ids: Optional[Set[int]] = None) -> int:
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"""
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Get a free GPU slot, evicting if necessary.
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Args:
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protected_logical_ids: Logical block IDs that cannot be evicted
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Returns:
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GPU slot ID
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Raises:
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RuntimeError: If no GPU slot is available
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"""
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if self.free_gpu_slots:
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return self.free_gpu_slots.popleft()
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# Need to evict - find victim using policy
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return self._evict_to_cpu(protected_logical_ids)
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def _try_allocate_gpu_slot(self, protected_logical_ids: Optional[Set[int]] = None) -> Optional[int]:
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"""
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Try to get a free GPU slot, evicting if necessary.
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Unlike _allocate_gpu_slot(), returns None instead of raising if no eviction possible.
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Args:
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protected_logical_ids: Logical block IDs that cannot be evicted
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Returns:
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GPU slot ID, or None if no slot available
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"""
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if self.free_gpu_slots:
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return self.free_gpu_slots.popleft()
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# Check if we can evict
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protected = protected_logical_ids or set()
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for gpu_slot, logical_id in self.gpu_slot_to_logical.items():
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if logical_id not in protected:
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block = self.logical_blocks[logical_id]
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if block.ref_count > 0:
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# Found evictable block
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return self._evict_to_cpu(protected_logical_ids)
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# No evictable blocks
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return None
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def _evict_to_cpu(self, protected_logical_ids: Optional[Set[int]] = None) -> int:
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"""
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Evict a GPU block to CPU to make room.
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Args:
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protected_logical_ids: Logical block IDs that cannot be evicted
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Returns:
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The freed GPU slot ID
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"""
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protected = protected_logical_ids or set()
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# Find candidates (blocks currently on GPU with ref_count > 0, excluding protected)
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candidates: Set[int] = set()
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for gpu_slot, logical_id in self.gpu_slot_to_logical.items():
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if logical_id in protected:
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continue # Skip protected blocks
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block = self.logical_blocks[logical_id]
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if block.ref_count > 0: # Only evict blocks still in use
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candidates.add(gpu_slot)
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if not candidates:
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raise RuntimeError(
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f"No GPU slots available for eviction. "
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f"GPU slots: {self.num_gpu_slots}, protected: {len(protected)}, "
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f"need more GPU memory or reduce sequence length"
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)
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# Use policy to select victim
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victim_gpu_slot = self.policy.select_victim(candidates)
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logical_id = self.gpu_slot_to_logical[victim_gpu_slot]
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block = self.logical_blocks[logical_id]
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# Allocate CPU block
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if not self.free_cpu_blocks:
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raise RuntimeError("Both GPU and CPU are full")
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cpu_block_id = self.free_cpu_blocks.popleft()
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# Async offload GPU -> CPU
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self.offload_engine.offload_block_async(
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layer_id=0, # TODO: handle per-layer offloading
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gpu_block_id=victim_gpu_slot,
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cpu_block_id=cpu_block_id,
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)
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# Update mappings
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del self.gpu_slot_to_logical[victim_gpu_slot]
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self.cpu_block_to_logical[cpu_block_id] = logical_id
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block.location = BlockLocation.CPU
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block.gpu_slot = -1
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block.cpu_block_id = cpu_block_id
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# Notify policy
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self.policy.on_block_evicted(victim_gpu_slot)
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return victim_gpu_slot
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def _ensure_on_gpu(
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self,
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logical_id: int,
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protected_logical_ids: Optional[Set[int]] = None,
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) -> int:
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"""
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Ensure a logical block is on GPU.
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Args:
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logical_id: Logical block ID
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protected_logical_ids: Logical block IDs that cannot be evicted
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Returns:
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GPU slot ID where the block is/will be
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"""
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block = self.logical_blocks[logical_id]
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if block.location == BlockLocation.GPU:
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# Already on GPU, update policy
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self.policy.on_block_access(block.gpu_slot, self.current_step)
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return block.gpu_slot
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if block.location == BlockLocation.CPU:
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# Need to prefetch from CPU
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gpu_slot = self._allocate_gpu_slot(protected_logical_ids)
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# Async prefetch CPU -> GPU
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self.offload_engine.prefetch_block_async(
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layer_id=0, # TODO: handle per-layer
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cpu_block_id=block.cpu_block_id,
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gpu_block_id=gpu_slot,
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)
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# Update mappings
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self.free_cpu_blocks.append(block.cpu_block_id)
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del self.cpu_block_to_logical[block.cpu_block_id]
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self.gpu_slot_to_logical[gpu_slot] = logical_id
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block.location = BlockLocation.GPU
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block.gpu_slot = gpu_slot
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block.cpu_block_id = -1
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# Notify policy
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self.policy.on_block_prefetched(gpu_slot, self.current_step)
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return gpu_slot
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raise RuntimeError(f"Block {logical_id} is in invalid state")
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def can_allocate(self, seq: Sequence) -> bool:
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"""Check if we can allocate blocks for a new sequence."""
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return len(self.free_logical_ids) >= seq.num_blocks
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def allocate(self, seq: Sequence) -> None:
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"""
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Allocate logical blocks for prefill.
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In cpu_primary mode (Chunked Offload): All blocks are allocated to CPU.
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In legacy mode: Blocks are allocated to GPU when possible, overflow to CPU.
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"""
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assert not seq.block_table, "Sequence already has blocks"
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# Ring buffer mode: all blocks are allocated to CPU
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if self.cpu_primary:
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return self.allocate_cpu_only(seq)
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# Legacy mode: GPU as primary, CPU as overflow
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h = -1
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cache_miss = False
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# Track blocks allocated for this sequence to protect them from eviction
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allocated_for_seq: Set[int] = set()
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for i in range(seq.num_blocks):
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token_ids = seq.block(i)
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# Hash for full blocks only
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if len(token_ids) == self._block_size:
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h = self.compute_hash(token_ids, h)
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else:
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h = -1
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# Check prefix cache
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cached_logical_id = self.hash_to_logical_id.get(h, -1)
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if cached_logical_id != -1:
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cached_block = self.logical_blocks[cached_logical_id]
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if cached_block.token_ids == token_ids and cached_block.ref_count > 0:
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# Cache hit
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cached_block.ref_count += 1
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seq.num_cached_tokens += self._block_size
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seq.block_table.append(cached_logical_id)
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allocated_for_seq.add(cached_logical_id)
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# Ensure block is on GPU (protect already allocated blocks)
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if cached_block.location == BlockLocation.CPU:
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self._ensure_on_gpu(cached_logical_id, allocated_for_seq)
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continue
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cache_miss = True
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# Allocate new logical block
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logical_id = self.free_logical_ids.popleft()
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block = self.logical_blocks[logical_id]
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block.ref_count = 1
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block.hash = h
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block.token_ids = token_ids.copy() if len(token_ids) == self._block_size else []
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# Try to allocate GPU slot
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gpu_slot = self._try_allocate_gpu_slot(allocated_for_seq)
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if gpu_slot is not None:
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# Got GPU slot
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block.location = BlockLocation.GPU
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block.gpu_slot = gpu_slot
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block.cpu_block_id = -1
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self.gpu_slot_to_logical[gpu_slot] = logical_id
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else:
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# GPU full and can't evict (all protected) - allocate to CPU
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# This block will be written via chunked prefill
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if not self.free_cpu_blocks:
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raise RuntimeError(
|
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f"Both GPU and CPU are full. Need {seq.num_blocks} blocks, "
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f"GPU has {self.num_gpu_slots}, CPU has {self.num_cpu_blocks}"
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)
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cpu_block_id = self.free_cpu_blocks.popleft()
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block.location = BlockLocation.CPU
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block.gpu_slot = -1
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block.cpu_block_id = cpu_block_id
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self.cpu_block_to_logical[cpu_block_id] = logical_id
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allocated_for_seq.add(logical_id)
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# Update prefix cache
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if h != -1:
|
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self.hash_to_logical_id[h] = logical_id
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|
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# Notify policy
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self.policy.on_block_allocated(gpu_slot, self.current_step)
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seq.block_table.append(logical_id)
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def deallocate(self, seq: Sequence) -> None:
|
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"""Release all blocks for a sequence."""
|
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for logical_id in reversed(seq.block_table):
|
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block = self.logical_blocks[logical_id]
|
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block.ref_count -= 1
|
|
|
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if block.ref_count == 0:
|
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# Free physical block
|
|
if block.location == BlockLocation.GPU:
|
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self.free_gpu_slots.append(block.gpu_slot)
|
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del self.gpu_slot_to_logical[block.gpu_slot]
|
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self.policy.on_block_deallocated(block.gpu_slot)
|
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elif block.location == BlockLocation.CPU:
|
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self.free_cpu_blocks.append(block.cpu_block_id)
|
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del self.cpu_block_to_logical[block.cpu_block_id]
|
|
|
|
# Free logical block
|
|
block.reset()
|
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self.free_logical_ids.append(logical_id)
|
|
|
|
# Remove from prefilled tracking
|
|
self.prefilled_blocks.discard(logical_id)
|
|
|
|
seq.num_cached_tokens = 0
|
|
seq.block_table.clear()
|
|
|
|
def can_append(self, seq: Sequence) -> bool:
|
|
"""Check if we can append a token."""
|
|
need_new_block = (len(seq) % self._block_size == 1)
|
|
return len(self.free_logical_ids) >= int(need_new_block)
|
|
|
|
def may_append(self, seq: Sequence) -> None:
|
|
"""Handle potential new block allocation during decode."""
|
|
block_table = seq.block_table
|
|
last_logical_id = block_table[-1]
|
|
last_block = self.logical_blocks[last_logical_id]
|
|
|
|
seq_len = len(seq)
|
|
pos_in_block = seq_len % self._block_size
|
|
|
|
if pos_in_block == 1:
|
|
# Need new block
|
|
assert last_block.hash != -1
|
|
|
|
logical_id = self.free_logical_ids.popleft()
|
|
block = self.logical_blocks[logical_id]
|
|
block.ref_count = 1
|
|
block.hash = -1
|
|
block.token_ids = []
|
|
|
|
if self.cpu_primary:
|
|
# Ring buffer mode: new block allocated to CPU
|
|
if not self.free_cpu_blocks:
|
|
raise RuntimeError("No free CPU blocks for decode")
|
|
cpu_block_id = self.free_cpu_blocks.popleft()
|
|
block.location = BlockLocation.CPU
|
|
block.cpu_block_id = cpu_block_id
|
|
block.gpu_slot = -1
|
|
self.cpu_block_to_logical[cpu_block_id] = logical_id
|
|
else:
|
|
# Legacy mode: new block allocated to GPU
|
|
gpu_slot = self._allocate_gpu_slot()
|
|
block.location = BlockLocation.GPU
|
|
block.gpu_slot = gpu_slot
|
|
self.gpu_slot_to_logical[gpu_slot] = logical_id
|
|
self.policy.on_block_allocated(gpu_slot, self.current_step)
|
|
|
|
block_table.append(logical_id)
|
|
|
|
elif pos_in_block == 0:
|
|
# Block is full, update hash for prefix cache
|
|
assert last_block.hash == -1
|
|
token_ids = seq.block(seq.num_blocks - 1)
|
|
prefix_hash = (
|
|
self.logical_blocks[block_table[-2]].hash
|
|
if len(block_table) > 1 else -1
|
|
)
|
|
h = self.compute_hash(token_ids, prefix_hash)
|
|
last_block.hash = h
|
|
last_block.token_ids = token_ids.copy()
|
|
self.hash_to_logical_id[h] = last_logical_id
|
|
|
|
def prepare_for_attention(
|
|
self,
|
|
seqs: List[Sequence],
|
|
is_prefill: bool,
|
|
) -> None:
|
|
"""
|
|
Prepare KV cache for attention computation.
|
|
|
|
For prefill: async prefetch blocks from CPU to GPU.
|
|
For decode: update gather_indices for CUDA graph.
|
|
"""
|
|
self.current_step += 1
|
|
|
|
# Collect all needed logical blocks
|
|
needed_logical_ids: Set[int] = set()
|
|
for seq in seqs:
|
|
needed_logical_ids.update(seq.block_table)
|
|
|
|
if is_prefill:
|
|
# Prefill: ensure all blocks on GPU (async prefetch)
|
|
# Pass needed_logical_ids as protected to prevent evicting blocks we need
|
|
for logical_id in needed_logical_ids:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.CPU:
|
|
self._ensure_on_gpu(logical_id, needed_logical_ids)
|
|
|
|
# Wait for all prefetches to complete
|
|
self.offload_engine.wait_all_transfers()
|
|
|
|
else:
|
|
# Decode: Check if we need chunked decode
|
|
cpu_blocks_count = sum(
|
|
1 for lid in needed_logical_ids
|
|
if self.logical_blocks[lid].location == BlockLocation.CPU
|
|
)
|
|
|
|
if cpu_blocks_count > self.num_gpu_slots:
|
|
# Too many blocks on CPU - will use chunked decode
|
|
# Don't try to load all blocks now
|
|
return
|
|
|
|
# Standard decode: prepare gather_indices for CUDA graph
|
|
# Identify blocks needing transfer
|
|
self.pending_gpu_loads.clear()
|
|
mappings_per_layer: List[List[Tuple[int, int]]] = [
|
|
[] for _ in range(self.offload_engine.num_layers)
|
|
]
|
|
|
|
for logical_id in needed_logical_ids:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.CPU:
|
|
# Allocate GPU slot (protect needed blocks from eviction)
|
|
gpu_slot = self._allocate_gpu_slot(needed_logical_ids)
|
|
|
|
# Record mapping for each layer
|
|
for layer_id in range(self.offload_engine.num_layers):
|
|
mappings_per_layer[layer_id].append(
|
|
(block.cpu_block_id, gpu_slot)
|
|
)
|
|
|
|
# Update block state
|
|
self.free_cpu_blocks.append(block.cpu_block_id)
|
|
del self.cpu_block_to_logical[block.cpu_block_id]
|
|
|
|
self.gpu_slot_to_logical[gpu_slot] = logical_id
|
|
block.location = BlockLocation.GPU
|
|
block.gpu_slot = gpu_slot
|
|
block.cpu_block_id = -1
|
|
|
|
self.pending_gpu_loads.add(logical_id)
|
|
self.policy.on_block_prefetched(gpu_slot, self.current_step)
|
|
|
|
elif block.location == BlockLocation.GPU:
|
|
self.policy.on_block_access(block.gpu_slot, self.current_step)
|
|
|
|
# Update gather indices (outside graph)
|
|
self.offload_engine.update_gather_indices_all_layers(mappings_per_layer)
|
|
self.offload_engine.sync_indices()
|
|
|
|
def needs_chunked_decode(self, seq: Sequence) -> bool:
|
|
"""
|
|
Check if sequence needs chunked decode.
|
|
|
|
Returns True if there are blocks on CPU and total blocks exceed GPU capacity.
|
|
"""
|
|
cpu_blocks = 0
|
|
for logical_id in seq.block_table:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.CPU:
|
|
cpu_blocks += 1
|
|
return cpu_blocks > 0 and len(seq.block_table) > self.num_gpu_slots
|
|
|
|
# ========== Chunked Decode Support ==========
|
|
|
|
def get_decode_chunk_info(self, seq: Sequence) -> Tuple[List[int], List[int], int]:
|
|
"""
|
|
Get information for chunked decode.
|
|
|
|
Returns:
|
|
(cpu_block_ids, cpu_logical_ids, num_chunks)
|
|
- cpu_block_ids: List of CPU block IDs in sequence order
|
|
- cpu_logical_ids: Corresponding logical block IDs
|
|
- num_chunks: Number of chunks needed
|
|
"""
|
|
cpu_block_ids = []
|
|
cpu_logical_ids = []
|
|
|
|
for logical_id in seq.block_table:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.CPU:
|
|
cpu_block_ids.append(block.cpu_block_id)
|
|
cpu_logical_ids.append(logical_id)
|
|
|
|
# Each chunk uses available GPU slots minus 1 (reserved for write block)
|
|
usable_slots = self.num_gpu_slots - 1
|
|
num_chunks = (len(cpu_block_ids) + usable_slots - 1) // usable_slots if usable_slots > 0 else 0
|
|
|
|
return cpu_block_ids, cpu_logical_ids, num_chunks
|
|
|
|
def load_decode_chunk(
|
|
self,
|
|
seq: Sequence,
|
|
cpu_block_ids: List[int],
|
|
cpu_logical_ids: List[int],
|
|
chunk_idx: int,
|
|
) -> List[int]:
|
|
"""
|
|
Load one chunk of CPU blocks to GPU for chunked decode.
|
|
|
|
Similar to chunked prefill: uses GPU slots to hold a batch of blocks.
|
|
|
|
Args:
|
|
seq: Sequence being decoded
|
|
cpu_block_ids: All CPU block IDs for this sequence
|
|
cpu_logical_ids: Corresponding logical block IDs
|
|
chunk_idx: Which chunk to load (0-indexed)
|
|
|
|
Returns:
|
|
List of GPU slot IDs where the chunk was loaded
|
|
"""
|
|
chunk_size = self.num_gpu_slots
|
|
start = chunk_idx * chunk_size
|
|
end = min(start + chunk_size, len(cpu_block_ids))
|
|
|
|
chunk_cpu_ids = cpu_block_ids[start:end]
|
|
chunk_logical_ids = cpu_logical_ids[start:end]
|
|
|
|
# Use GPU slots 0, 1, 2, ... for this chunk
|
|
gpu_slots = list(range(len(chunk_cpu_ids)))
|
|
|
|
# Load all layers at once using offload_engine
|
|
self.offload_engine.load_cpu_blocks_to_gpu_slots_all_layers(
|
|
chunk_cpu_ids, gpu_slots
|
|
)
|
|
|
|
return gpu_slots
|
|
|
|
def get_gpu_blocks_for_decode(self, seq: Sequence) -> Tuple[List[int], List[int]]:
|
|
"""
|
|
Get blocks currently on GPU for this sequence.
|
|
|
|
Returns:
|
|
(gpu_slots, logical_ids) - GPU slot IDs and corresponding logical block IDs
|
|
"""
|
|
gpu_slots = []
|
|
logical_ids = []
|
|
|
|
for logical_id in seq.block_table:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.GPU:
|
|
gpu_slots.append(block.gpu_slot)
|
|
logical_ids.append(logical_id)
|
|
|
|
return gpu_slots, logical_ids
|
|
|
|
def get_kv_for_gpu_slots(
|
|
self,
|
|
layer_id: int,
|
|
gpu_slots: List[int],
|
|
) -> Tuple[torch.Tensor, torch.Tensor]:
|
|
"""
|
|
Get KV tensors for specific GPU slots.
|
|
|
|
Args:
|
|
layer_id: Layer index
|
|
gpu_slots: List of GPU slot IDs
|
|
|
|
Returns:
|
|
(k, v) tensors with shape [1, num_tokens, kv_heads, head_dim]
|
|
"""
|
|
k_cache, v_cache = self.offload_engine.get_layer_cache(layer_id)
|
|
# k_cache, v_cache shape: [num_gpu_blocks, block_size, kv_heads, head_dim]
|
|
|
|
k_chunks = [k_cache[slot] for slot in gpu_slots]
|
|
v_chunks = [v_cache[slot] for slot in gpu_slots]
|
|
|
|
# Concatenate and add batch dimension
|
|
k = torch.cat(k_chunks, dim=0).unsqueeze(0) # [1, tokens, heads, dim]
|
|
v = torch.cat(v_chunks, dim=0).unsqueeze(0)
|
|
|
|
return k, v
|
|
|
|
def ensure_last_block_on_gpu(self, seq: Sequence) -> int:
|
|
"""
|
|
Ensure the last block is on GPU for writing new KV.
|
|
|
|
Uses a RESERVED slot (last slot) to avoid conflicts with chunked decode
|
|
which uses slots 0, 1, 2, ... for loading CPU blocks.
|
|
|
|
Returns:
|
|
GPU slot ID for the last block
|
|
"""
|
|
last_logical_id = seq.block_table[-1]
|
|
block = self.logical_blocks[last_logical_id]
|
|
|
|
if block.location == BlockLocation.GPU:
|
|
return block.gpu_slot
|
|
|
|
# Use last slot as reserved slot for write block
|
|
# This avoids conflicts with chunked decode which uses slots 0, 1, 2...
|
|
reserved_slot = self.num_gpu_slots - 1
|
|
|
|
# Load this block to GPU for all layers
|
|
self.offload_engine.load_cpu_blocks_to_gpu_slots_all_layers(
|
|
[block.cpu_block_id], [reserved_slot]
|
|
)
|
|
|
|
# Update block state
|
|
self.free_cpu_blocks.append(block.cpu_block_id)
|
|
del self.cpu_block_to_logical[block.cpu_block_id]
|
|
|
|
self.gpu_slot_to_logical[reserved_slot] = last_logical_id
|
|
block.location = BlockLocation.GPU
|
|
block.gpu_slot = reserved_slot
|
|
block.cpu_block_id = -1
|
|
|
|
return reserved_slot
|
|
|
|
def get_gpu_block_tables(
|
|
self,
|
|
seqs: List[Sequence],
|
|
) -> List[List[int]]:
|
|
"""
|
|
Get GPU slot tables for sequences.
|
|
|
|
Returns GPU slot IDs, which may differ from logical block IDs.
|
|
"""
|
|
result = []
|
|
for seq in seqs:
|
|
gpu_table = []
|
|
for logical_id in seq.block_table:
|
|
block = self.logical_blocks[logical_id]
|
|
assert block.location == BlockLocation.GPU, (
|
|
f"Block {logical_id} not on GPU (location={block.location})"
|
|
)
|
|
gpu_table.append(block.gpu_slot)
|
|
result.append(gpu_table)
|
|
return result
|
|
|
|
def post_attention_cleanup(
|
|
self,
|
|
seqs: List[Sequence],
|
|
is_prefill: bool,
|
|
) -> None:
|
|
"""
|
|
Cleanup after attention.
|
|
|
|
Clear pending loads and optionally proactive offload.
|
|
"""
|
|
self.pending_gpu_loads.clear()
|
|
|
|
# ========== Chunked Prefill Support ==========
|
|
|
|
def needs_chunked_prefill(self, seq: Sequence) -> bool:
|
|
"""
|
|
Check if sequence needs chunked prefill.
|
|
|
|
Returns True if there are unprefilled blocks that are on CPU.
|
|
This indicates we need to process in chunks because not all blocks fit on GPU.
|
|
"""
|
|
for logical_id in seq.block_table:
|
|
if logical_id not in self.prefilled_blocks:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.CPU:
|
|
return True
|
|
return False
|
|
|
|
def get_gpu_block_count(self, seq: Sequence) -> int:
|
|
"""Get number of blocks currently on GPU for this sequence."""
|
|
count = 0
|
|
for logical_id in seq.block_table:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.GPU:
|
|
count += 1
|
|
return count
|
|
|
|
def get_prefill_chunk_info(self, seq: Sequence) -> Tuple[int, int, List[int]]:
|
|
"""
|
|
Get information for current prefill chunk.
|
|
|
|
Returns:
|
|
(start_block_idx, end_block_idx, gpu_block_ids)
|
|
- start_block_idx: First block index in this chunk
|
|
- end_block_idx: Last block index (exclusive) in this chunk
|
|
- gpu_block_ids: GPU slot IDs for blocks in this chunk
|
|
"""
|
|
start_idx = -1
|
|
end_idx = -1
|
|
gpu_block_ids = []
|
|
|
|
for i, logical_id in enumerate(seq.block_table):
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.GPU:
|
|
if start_idx == -1:
|
|
start_idx = i
|
|
end_idx = i + 1
|
|
gpu_block_ids.append(block.gpu_slot)
|
|
elif start_idx != -1:
|
|
# Found CPU block after GPU blocks - stop here
|
|
break
|
|
|
|
if start_idx == -1:
|
|
return (0, 0, [])
|
|
|
|
return (start_idx, end_idx, gpu_block_ids)
|
|
|
|
def complete_prefill_chunk(self, seq: Sequence) -> bool:
|
|
"""
|
|
Complete a prefill chunk: mark blocks as prefilled, offload to CPU, load next chunk.
|
|
|
|
Returns:
|
|
True if there are more chunks to process, False if done.
|
|
"""
|
|
# Find blocks currently on GPU that were just prefilled
|
|
gpu_blocks_to_offload = []
|
|
for logical_id in seq.block_table:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.GPU and logical_id not in self.prefilled_blocks:
|
|
# Mark as prefilled
|
|
self.prefilled_blocks.add(logical_id)
|
|
gpu_blocks_to_offload.append(logical_id)
|
|
|
|
# Offload prefilled GPU blocks to CPU
|
|
for logical_id in gpu_blocks_to_offload:
|
|
block = self.logical_blocks[logical_id]
|
|
if not self.free_cpu_blocks:
|
|
raise RuntimeError("No free CPU blocks for offload")
|
|
|
|
cpu_block_id = self.free_cpu_blocks.popleft()
|
|
|
|
# Async offload all layers
|
|
for layer_id in range(self.offload_engine.num_layers):
|
|
self.offload_engine.offload_block_async(
|
|
layer_id=layer_id,
|
|
gpu_block_id=block.gpu_slot,
|
|
cpu_block_id=cpu_block_id,
|
|
)
|
|
|
|
# Update mappings
|
|
self.free_gpu_slots.append(block.gpu_slot)
|
|
del self.gpu_slot_to_logical[block.gpu_slot]
|
|
self.cpu_block_to_logical[cpu_block_id] = logical_id
|
|
|
|
block.location = BlockLocation.CPU
|
|
block.cpu_block_id = cpu_block_id
|
|
block.gpu_slot = -1
|
|
|
|
# Wait for offload to complete
|
|
self.offload_engine.wait_all_transfers()
|
|
|
|
# Find next UNPREFILLED CPU blocks and bring them to GPU
|
|
cpu_blocks_to_load = []
|
|
for logical_id in seq.block_table:
|
|
if logical_id in self.prefilled_blocks:
|
|
continue # Skip already prefilled
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.CPU:
|
|
if len(cpu_blocks_to_load) >= self.num_gpu_slots:
|
|
break # GPU is full
|
|
cpu_blocks_to_load.append(logical_id)
|
|
|
|
if not cpu_blocks_to_load:
|
|
return False # All blocks have been prefilled
|
|
|
|
# Load unprefilled CPU blocks to GPU
|
|
for logical_id in cpu_blocks_to_load:
|
|
block = self.logical_blocks[logical_id]
|
|
gpu_slot = self.free_gpu_slots.popleft()
|
|
|
|
# Note: We're NOT prefetching existing data - these blocks are being
|
|
# loaded for the first time, so we just need to assign GPU slots
|
|
# The model will write new KV cache data to these slots
|
|
|
|
# Update mappings
|
|
self.free_cpu_blocks.append(block.cpu_block_id)
|
|
del self.cpu_block_to_logical[block.cpu_block_id]
|
|
self.gpu_slot_to_logical[gpu_slot] = logical_id
|
|
|
|
block.location = BlockLocation.GPU
|
|
block.gpu_slot = gpu_slot
|
|
block.cpu_block_id = -1
|
|
|
|
return True # More chunks to process
|
|
|
|
def get_gpu_block_tables_partial(
|
|
self,
|
|
seqs: List[Sequence],
|
|
) -> List[Tuple[List[int], int, int]]:
|
|
"""
|
|
Get GPU block tables for chunked prefill.
|
|
|
|
Returns list of (gpu_block_ids, start_block_idx, end_block_idx) per sequence.
|
|
Only includes blocks that are currently on GPU AND haven't been prefilled yet.
|
|
"""
|
|
result = []
|
|
for seq in seqs:
|
|
gpu_table = []
|
|
start_idx = -1
|
|
end_idx = -1
|
|
|
|
for i, logical_id in enumerate(seq.block_table):
|
|
# Skip already prefilled blocks
|
|
if logical_id in self.prefilled_blocks:
|
|
continue
|
|
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.GPU:
|
|
if start_idx == -1:
|
|
start_idx = i
|
|
end_idx = i + 1
|
|
gpu_table.append(block.gpu_slot)
|
|
elif start_idx != -1:
|
|
# Stop at first non-GPU block after GPU blocks
|
|
break
|
|
|
|
if start_idx == -1:
|
|
start_idx = 0
|
|
end_idx = 0
|
|
|
|
result.append((gpu_table, start_idx, end_idx))
|
|
return result
|
|
|
|
def get_prefilled_cpu_blocks(self, seq: Sequence) -> List[int]:
|
|
"""
|
|
Get list of CPU block IDs for blocks that have been prefilled.
|
|
|
|
Used for loading previous KV during chunked prefill.
|
|
|
|
Returns:
|
|
List of CPU block IDs in sequence order
|
|
"""
|
|
cpu_blocks = []
|
|
for logical_id in seq.block_table:
|
|
if logical_id in self.prefilled_blocks:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.CPU:
|
|
cpu_blocks.append(block.cpu_block_id)
|
|
logger.debug(
|
|
f"get_prefilled_cpu_blocks: prefilled_blocks={list(self.prefilled_blocks)}, "
|
|
f"returned cpu_blocks={cpu_blocks}"
|
|
)
|
|
return cpu_blocks
|
|
|
|
def load_prev_kv_for_layer(
|
|
self,
|
|
seq: Sequence,
|
|
layer_id: int,
|
|
) -> Tuple[Optional[torch.Tensor], Optional[torch.Tensor]]:
|
|
"""
|
|
Load previous prefilled KV from CPU for a specific layer.
|
|
|
|
This concatenates KV from all previously prefilled blocks for use
|
|
during chunked prefill attention.
|
|
|
|
Args:
|
|
seq: Sequence to load KV for
|
|
layer_id: Layer index
|
|
|
|
Returns:
|
|
(k, v) tensors with shape [1, total_prev_tokens, kv_heads, head_dim]
|
|
or (None, None) if no previous KV exists
|
|
"""
|
|
cpu_blocks = self.get_prefilled_cpu_blocks(seq)
|
|
if not cpu_blocks:
|
|
return None, None
|
|
|
|
k_chunks = []
|
|
v_chunks = []
|
|
|
|
for cpu_block_id in cpu_blocks:
|
|
k, v = self.offload_engine.get_cpu_block(layer_id, cpu_block_id)
|
|
# k, v shape: [block_size, kv_heads, head_dim]
|
|
k_chunks.append(k)
|
|
v_chunks.append(v)
|
|
|
|
# Concatenate all chunks
|
|
k_prev = torch.cat(k_chunks, dim=0) # [total_prev_tokens, kv_heads, head_dim]
|
|
v_prev = torch.cat(v_chunks, dim=0)
|
|
|
|
# Move to GPU and add batch dimension
|
|
k_prev = k_prev.to("cuda", non_blocking=True).unsqueeze(0) # [1, tokens, heads, dim]
|
|
v_prev = v_prev.to("cuda", non_blocking=True).unsqueeze(0)
|
|
|
|
return k_prev, v_prev
|
|
|
|
def get_chunk_start_position(self, seq: Sequence) -> int:
|
|
"""
|
|
Get the starting token position for the current chunk.
|
|
|
|
This is the total number of tokens in previously prefilled blocks.
|
|
|
|
Returns:
|
|
Token position offset for current chunk
|
|
"""
|
|
pos = 0
|
|
for logical_id in seq.block_table:
|
|
if logical_id in self.prefilled_blocks:
|
|
# Full block's worth of tokens
|
|
pos += self._block_size
|
|
else:
|
|
break
|
|
return pos
|
|
|
|
# ========== Ring Buffer CPU-primary support ==========
|
|
|
|
def allocate_cpu_only(self, seq: Sequence) -> None:
|
|
"""
|
|
Allocate CPU blocks for sequence (for ring buffer mode).
|
|
|
|
Unlike allocate(), here all blocks are allocated to CPU,
|
|
GPU is only used as ring buffer for computation.
|
|
|
|
Args:
|
|
seq: Sequence to allocate
|
|
"""
|
|
assert not seq.block_table, "Sequence already has blocks"
|
|
|
|
h = -1 # Running hash for prefix cache
|
|
|
|
for i in range(seq.num_blocks):
|
|
# Allocate CPU block
|
|
if not self.free_cpu_blocks:
|
|
raise RuntimeError(
|
|
f"No free CPU blocks. Need {seq.num_blocks}, "
|
|
f"available: {len(self.free_cpu_blocks)}"
|
|
)
|
|
|
|
cpu_block_id = self.free_cpu_blocks.popleft()
|
|
|
|
# Get token IDs for this block and compute hash
|
|
token_ids = seq.block(i)
|
|
if len(token_ids) == self._block_size:
|
|
h = self.compute_hash(token_ids, h)
|
|
else:
|
|
h = -1 # Incomplete block
|
|
|
|
# Allocate logical block
|
|
logical_id = self.free_logical_ids.popleft()
|
|
block = self.logical_blocks[logical_id]
|
|
block.ref_count = 1
|
|
block.hash = h
|
|
block.token_ids = token_ids.copy() if len(token_ids) == self._block_size else []
|
|
block.location = BlockLocation.CPU
|
|
block.cpu_block_id = cpu_block_id
|
|
block.gpu_slot = -1
|
|
|
|
self.cpu_block_to_logical[cpu_block_id] = logical_id
|
|
seq.block_table.append(logical_id)
|
|
|
|
# Update prefix cache
|
|
if h != -1:
|
|
self.hash_to_logical_id[h] = logical_id
|
|
|
|
def get_cpu_block_table(self, seq: Sequence) -> List[int]:
|
|
"""
|
|
Get CPU block ID list for sequence.
|
|
|
|
Args:
|
|
seq: Sequence
|
|
|
|
Returns:
|
|
List of CPU block IDs in sequence order
|
|
"""
|
|
cpu_blocks = []
|
|
for logical_id in seq.block_table:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.CPU:
|
|
cpu_blocks.append(block.cpu_block_id)
|
|
else:
|
|
# If block is on GPU, it should have a corresponding CPU block
|
|
# In ring buffer mode, all data ultimately resides on CPU
|
|
raise RuntimeError(
|
|
f"Block {logical_id} not on CPU (location={block.location}). "
|
|
f"In ring buffer mode, all blocks should be on CPU."
|
|
)
|
|
return cpu_blocks
|
|
|
|
def get_all_cpu_blocks(self, seq: Sequence) -> Tuple[List[int], List[int]]:
|
|
"""
|
|
Get all CPU blocks and their logical IDs for sequence.
|
|
|
|
Args:
|
|
seq: Sequence
|
|
|
|
Returns:
|
|
(cpu_block_ids, logical_ids)
|
|
"""
|
|
cpu_block_ids = []
|
|
logical_ids = []
|
|
for logical_id in seq.block_table:
|
|
block = self.logical_blocks[logical_id]
|
|
if block.location == BlockLocation.CPU:
|
|
cpu_block_ids.append(block.cpu_block_id)
|
|
logical_ids.append(logical_id)
|
|
return cpu_block_ids, logical_ids
|
|
|
|
def allocate_next_cpu_block(self, seq: Sequence) -> int:
|
|
"""
|
|
Allocate next CPU block for sequence (for new token during decode).
|
|
|
|
Args:
|
|
seq: Sequence
|
|
|
|
Returns:
|
|
Newly allocated CPU block ID
|
|
"""
|
|
if not self.free_cpu_blocks:
|
|
raise RuntimeError("No free CPU blocks")
|
|
|
|
cpu_block_id = self.free_cpu_blocks.popleft()
|
|
logical_id = self.free_logical_ids.popleft()
|
|
|
|
block = self.logical_blocks[logical_id]
|
|
block.ref_count = 1
|
|
block.location = BlockLocation.CPU
|
|
block.cpu_block_id = cpu_block_id
|
|
block.gpu_slot = -1
|
|
|
|
self.cpu_block_to_logical[cpu_block_id] = logical_id
|
|
seq.block_table.append(logical_id)
|
|
|
|
return cpu_block_id
|
|
|
|
def get_last_cpu_block(self, seq: Sequence) -> int:
|
|
"""
|
|
Get CPU block ID of the last block in sequence.
|
|
|
|
Returns -1 if the last block is not on CPU.
|
|
|
|
Args:
|
|
seq: Sequence
|
|
|
|
Returns:
|
|
CPU block ID, or -1 if not on CPU
|
|
"""
|
|
if not seq.block_table:
|
|
return -1
|
|
|
|
last_logical_id = seq.block_table[-1]
|
|
block = self.logical_blocks[last_logical_id]
|
|
|
|
if block.location == BlockLocation.CPU:
|
|
return block.cpu_block_id
|
|
return -1
|
|
|
|
def get_write_slot_for_chunked_offload(self, seq: Sequence) -> int:
|
|
"""
|
|
Get GPU slot for writing new KV during chunked offload decode.
|
|
|
|
In ring buffer design, always use decode_slot (slot[0]) to write new KV.
|
|
This avoids conflicts with loading operations which use slots[1:].
|
|
|
|
Args:
|
|
seq: Sequence
|
|
|
|
Returns:
|
|
GPU slot ID (always decode_slot = 0)
|
|
"""
|
|
return self.offload_engine.decode_slot
|
|
|
|
def get_decode_start_pos(self, seq: Sequence) -> int:
|
|
"""
|
|
Get the starting position within block where decode tokens began.
|
|
|
|
This is used for batched offload optimization - we need to attend to all
|
|
accumulated tokens in decode slot, not just the current one.
|
|
|
|
Args:
|
|
seq: Sequence
|
|
|
|
Returns:
|
|
Starting position within block (0 to block_size-1)
|
|
"""
|
|
seq_id = id(seq)
|
|
if seq_id not in self._decode_start_pos:
|
|
# First decode step - compute starting position
|
|
# After prefill, the last block has some tokens filled
|
|
# Decode starts at the next position
|
|
prefill_len = len(seq) - 1 # Current len includes the new decode token
|
|
self._decode_start_pos[seq_id] = prefill_len % self._block_size
|
|
return self._decode_start_pos[seq_id]
|
|
|
|
def reset_decode_start_pos(self, seq: Sequence) -> None:
|
|
"""
|
|
Reset decode start position for sequence.
|
|
|
|
Called when block is full and offloaded - next decode starts at position 0.
|
|
|
|
Args:
|
|
seq: Sequence
|
|
"""
|
|
seq_id = id(seq)
|
|
self._decode_start_pos[seq_id] = 0
|
|
|
|
def clear_decode_tracking(self, seq: Sequence) -> None:
|
|
"""
|
|
Clear decode position tracking for sequence.
|
|
|
|
Called when sequence is deallocated.
|
|
|
|
Args:
|
|
seq: Sequence
|
|
"""
|
|
seq_id = id(seq)
|
|
self._decode_start_pos.pop(seq_id, None)
|
|
|
|
def __repr__(self) -> str:
|
|
return (
|
|
f"HybridKVCacheManager(\n"
|
|
f" num_gpu_slots={self.num_gpu_slots},\n"
|
|
f" num_cpu_blocks={self.num_cpu_blocks},\n"
|
|
f" block_size={self._block_size},\n"
|
|
f" free_logical={len(self.free_logical_ids)},\n"
|
|
f" free_gpu={len(self.free_gpu_slots)},\n"
|
|
f" free_cpu={len(self.free_cpu_blocks)},\n"
|
|
f" policy={self.policy}\n"
|
|
f")"
|
|
)
|