[FEAT]Support reset prefix cache by specified device

vllm/core/block/cpu_gpu_block_allocator.py

@@ -341,8 +341,10 @@ def get_prefix_cache_hit_rate(self, device: Device) -> float:
         assert device in self._allocators
         return self._allocators[device].get_prefix_cache_hit_rate()
 
-    def reset_prefix_cache(self) -> bool:
-        """Reset prefix cache for all devices."""
+    def reset_prefix_cache(self, device: Optional[Device] = None) -> bool:
+        """Reset prefix cache for specified or all devices."""
+        if device:
+            return self._allocators[device].reset_prefix_cache()
         success = True
         for allocator in self._allocators.values():
             success = success and allocator.reset_prefix_cache()

vllm/core/block/interfaces.py

@@ -305,7 +305,7 @@ def get_prefix_cache_hit_rate(self, device: Device) -> float:
         pass
 
     @abstractmethod
-    def reset_prefix_cache(self) -> bool:
+    def reset_prefix_cache(self, device: Optional[Device] = None) -> bool:
         """Reset prefix cache."""
         pass
 

vllm/core/block_manager.py

@@ -456,8 +456,8 @@ def get_num_free_cpu_blocks(self) -> int:
     def get_prefix_cache_hit_rate(self, device: Device) -> float:
         return self.block_allocator.get_prefix_cache_hit_rate(device)
 
-    def reset_prefix_cache(self) -> bool:
-        return self.block_allocator.reset_prefix_cache()
+    def reset_prefix_cache(self, device: Optional[Device] = None) -> bool:
+        return self.block_allocator.reset_prefix_cache(device)
 
     def _can_swap(self,
                   seq_group: SequenceGroup,

vllm/core/interfaces.py

@@ -2,7 +2,7 @@
 
 import enum
 from abc import ABC, abstractmethod
-from typing import List
+from typing import List, Optional
 from typing import Sequence as GenericSequence
 from typing import Tuple
 
@@ -125,8 +125,8 @@ def get_prefix_cache_hit_rate(self, device: Device) -> float:
         pass
 
     @abstractmethod
-    def reset_prefix_cache(self) -> bool:
-        """Reset prefix cache for all devices."""
+    def reset_prefix_cache(self, device: Optional[Device] = None) -> bool:
+        """Reset prefix cache for specified or all devices."""
         pass
 
     @abstractmethod

vllm/core/placeholder_block_space_manager.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
-from typing import List, Tuple
+from typing import List, Optional, Tuple
 
 from vllm.core.interfaces import AllocStatus, BlockSpaceManager
 from vllm.sequence import Sequence, SequenceGroup
@@ -92,7 +92,7 @@ def mark_blocks_as_computed(self, seq_group: SequenceGroup,
     def get_prefix_cache_hit_rate(self, device: Device) -> float:
         return -1
 
-    def reset_prefix_cache(self) -> bool:
+    def reset_prefix_cache(self, device: Optional[Device] = None) -> bool:
         return True
 
     def get_num_cached_tokens(self, seq: Sequence) -> int:

vllm/core/scheduler.py

@@ -634,8 +634,8 @@ def has_unfinished_seqs(self) -> bool:
     def get_prefix_cache_hit_rate(self, device: Device) -> float:
         return self.block_manager.get_prefix_cache_hit_rate(device)
 
-    def reset_prefix_cache(self) -> bool:
-        return self.block_manager.reset_prefix_cache()
+    def reset_prefix_cache(self, device: Optional[Device] = None) -> bool:
+        return self.block_manager.reset_prefix_cache(device)
 
     def get_num_unfinished_seq_groups(self) -> int:
         return len(self.waiting) + len(self.running) + len(self.swapped)

vllm/engine/async_llm_engine.py

@@ -35,7 +35,7 @@
 from vllm.sequence import ExecuteModelRequest
 from vllm.transformers_utils.tokenizer import AnyTokenizer
 from vllm.usage.usage_lib import UsageContext
-from vllm.utils import deprecate_kwargs, weak_bind
+from vllm.utils import Device, deprecate_kwargs, weak_bind
 
 logger = init_logger(__name__)
 ENGINE_ITERATION_TIMEOUT_S = envs.VLLM_ENGINE_ITERATION_TIMEOUT_S
@@ -1216,8 +1216,9 @@ async def start_profile(self) -> None:
     async def stop_profile(self) -> None:
         self.engine.stop_profile()
 
-    async def reset_prefix_cache(self) -> None:
-        self.engine.reset_prefix_cache()
+    async def reset_prefix_cache(self,
+                                 device: Optional[Device] = None) -> None:
+        self.engine.reset_prefix_cache(device)
 
     async def sleep(self, level: int = 1) -> None:
         self.engine.sleep(level)

vllm/engine/llm_engine.py

@@ -955,12 +955,12 @@ def has_unfinished_requests_for_virtual_engine(
         """
         return self.scheduler[virtual_engine].has_unfinished_seqs()
 
-    def reset_prefix_cache(self) -> bool:
+    def reset_prefix_cache(self, device: Optional[Device] = None) -> bool:
         """Reset prefix cache for all devices."""
 
         success = True
         for scheduler in self.scheduler:
-            success = success and scheduler.reset_prefix_cache()
+            success = success and scheduler.reset_prefix_cache(device)
         return success
 
     @staticmethod

vllm/engine/multiprocessing/__init__.py

@@ -13,7 +13,7 @@
 from vllm.outputs import RequestOutput
 from vllm.prompt_adapter.request import PromptAdapterRequest
 from vllm.sampling_params import SamplingParams
-from vllm.utils import deprecate_kwargs
+from vllm.utils import Device, deprecate_kwargs
 
 VLLM_RPC_SUCCESS_STR = "SUCCESS"
 
@@ -123,8 +123,9 @@ class RPCUProfileRequest(Enum):
     STOP_PROFILE = 2
 
 
-class RPCResetPrefixCacheRequest(Enum):
-    RESET_PREFIX_CACHE = 1
+@dataclass
+class RPCResetPrefixCacheRequest:
+    device: Device
 
 
 class RPCSleepRequest(Enum):

vllm/engine/multiprocessing/client.py

@@ -47,7 +47,7 @@
 from vllm.prompt_adapter.request import PromptAdapterRequest
 from vllm.sampling_params import SamplingParams
 from vllm.transformers_utils.tokenizer_group import init_tokenizer_from_configs
-from vllm.utils import deprecate_kwargs
+from vllm.utils import Device, deprecate_kwargs
 
 logger = init_logger(__name__)
 
@@ -684,11 +684,12 @@ async def stop_profile(self) -> None:
         await self._send_one_way_rpc_request(
             request=RPCUProfileRequest.STOP_PROFILE, socket=self.input_socket)
 
-    async def reset_prefix_cache(self) -> None:
+    async def reset_prefix_cache(self,
+                                 device: Optional[Device] = None) -> None:
         """Reset the prefix cache"""
 
         await self._send_one_way_rpc_request(
-            request=RPCResetPrefixCacheRequest.RESET_PREFIX_CACHE,
+            request=RPCResetPrefixCacheRequest(device),
             socket=self.input_socket)
 
     async def sleep(self, level: int = 1) -> None:

vllm/engine/protocol.py

@@ -18,7 +18,7 @@
 from vllm.prompt_adapter.request import PromptAdapterRequest
 from vllm.sampling_params import BeamSearchParams, SamplingParams
 from vllm.transformers_utils.tokenizer import AnyTokenizer
-from vllm.utils import collect_from_async_generator, random_uuid
+from vllm.utils import Device, collect_from_async_generator, random_uuid
 
 logger = init_logger(__name__)
 
@@ -274,7 +274,8 @@ async def stop_profile(self) -> None:
         ...
 
     @abstractmethod
-    async def reset_prefix_cache(self) -> None:
+    async def reset_prefix_cache(self,
+                                 device: Optional[Device] = None) -> None:
         """Reset the prefix cache"""
         ...
 

vllm/entrypoints/llm.py

@@ -42,7 +42,8 @@
                                                get_cached_tokenizer)
 from vllm.transformers_utils.tokenizer_group import TokenizerGroup
 from vllm.usage.usage_lib import UsageContext
-from vllm.utils import Counter, deprecate_args, deprecate_kwargs, is_list_of
+from vllm.utils import (Counter, Device, deprecate_args, deprecate_kwargs,
+                        is_list_of)
 
 logger = init_logger(__name__)
 
@@ -1187,8 +1188,8 @@ def start_profile(self) -> None:
     def stop_profile(self) -> None:
         self.llm_engine.stop_profile()
 
-    def reset_prefix_cache(self) -> bool:
-        return self.llm_engine.reset_prefix_cache()
+    def reset_prefix_cache(self, device: Optional[Device] = None) -> bool:
+        return self.llm_engine.reset_prefix_cache(device)
 
     def sleep(self, level: int = 1):
         """

vllm/entrypoints/openai/api_server.py

@@ -85,7 +85,7 @@
 from vllm.transformers_utils.config import (
     maybe_register_config_serialize_by_value)
 from vllm.usage.usage_lib import UsageContext
-from vllm.utils import (FlexibleArgumentParser, get_open_zmq_ipc_path,
+from vllm.utils import (Device, FlexibleArgumentParser, get_open_zmq_ipc_path,
                         is_valid_ipv6_address, set_ulimit)
 from vllm.version import __version__ as VLLM_VERSION
 
@@ -677,8 +677,12 @@ async def reset_prefix_cache(raw_request: Request):
         Reset the prefix cache. Note that we currently do not check if the
         prefix cache is successfully reset in the API server.
         """
-        logger.info("Resetting prefix cache...")
-        await engine_client(raw_request).reset_prefix_cache()
+        device = None
+        device_str = raw_request.query_params.get("device")
+        if device_str is not None:
+            device = Device[device_str.upper()]
+        logger.info("Resetting prefix cache with specific %s...", str(device))
+        await engine_client(raw_request).reset_prefix_cache(device)
         return Response(status_code=200)
 
     @router.post("/sleep")

vllm/v1/engine/async_llm.py

@@ -24,7 +24,7 @@
 from vllm.transformers_utils.tokenizer import AnyTokenizer
 from vllm.transformers_utils.tokenizer_group import init_tokenizer_from_configs
 from vllm.usage.usage_lib import UsageContext
-from vllm.utils import cdiv, kill_process_tree
+from vllm.utils import Device, cdiv, kill_process_tree
 from vllm.v1.engine.core_client import EngineCoreClient
 from vllm.v1.engine.output_processor import OutputProcessor
 from vllm.v1.engine.parallel_sampling import ParentRequest
@@ -398,7 +398,10 @@ async def start_profile(self) -> None:
     async def stop_profile(self) -> None:
         await self.engine_core.profile_async(False)
 
-    async def reset_prefix_cache(self) -> None:
+    async def reset_prefix_cache(self,
+                                 device: Optional[Device] = None) -> None:
+        if device == Device.CPU:
+            raise ValueError("Not supported on CPU.")
         await self.engine_core.reset_prefix_cache_async()
 
     async def sleep(self, level: int = 1) -> None:

vllm/v1/engine/llm_engine.py

@@ -20,6 +20,7 @@
 from vllm.transformers_utils.tokenizer_group import (
     BaseTokenizerGroup, init_tokenizer_from_configs)
 from vllm.usage.usage_lib import UsageContext
+from vllm.utils import Device
 from vllm.v1.engine.core_client import EngineCoreClient
 from vllm.v1.engine.output_processor import OutputProcessor
 from vllm.v1.engine.parallel_sampling import ParentRequest
@@ -226,7 +227,7 @@ def start_profile(self):
     def stop_profile(self):
         self.engine_core.profile(False)
 
-    def reset_prefix_cache(self):
+    def reset_prefix_cache(self, device: Optional[Device] = None):
         self.engine_core.reset_prefix_cache()
 
     def sleep(self, level: int = 1):