[V0 Deprecation] Remove async_output_proc, preemption mode, delay factor (#25334)

Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>

tests/detokenizer/test_stop_strings.py

@@ -32,10 +32,6 @@ def _test_stopping(llm: LLM,
     assert output.stop_reason == expected_reason
 
 
-def _set_async_mode(llm, is_async):
-    llm.llm_engine.scheduler[0].use_async_output_proc = is_async
-
-
 def _stop_basic(llm):
     _test_stopping(llm,
                    stop=["."],
@@ -103,40 +99,8 @@ def test_stop_strings():
     # async output processing below.
     llm = LLM(MODEL, enforce_eager=envs.VLLM_USE_V1)
 
-    if envs.VLLM_USE_V1:
-        _stop_basic(llm)
-    else:
-        _set_async_mode(llm, True)
-        _stop_basic(llm)
-
-        _set_async_mode(llm, False)
-        _stop_basic(llm)
-
-    if envs.VLLM_USE_V1:
-        _stop_multi_tokens(llm)
-    else:
-        _set_async_mode(llm, True)
-        _stop_multi_tokens(llm)
-
-        _set_async_mode(llm, False)
-        _stop_multi_tokens(llm)
-
-    if envs.VLLM_USE_V1:
-        _stop_partial_token(llm)
-    else:
-        _set_async_mode(llm, True)
-        _stop_partial_token(llm)
-
-        _set_async_mode(llm, False)
-        _stop_partial_token(llm)
-
-    if envs.VLLM_USE_V1:
-        # FIXME: this does not respect include_in_output=False
-        # _stop_token_id(llm)
-        pass
-    else:
-        _set_async_mode(llm, True)
-        _stop_token_id(llm)
-
-        _set_async_mode(llm, False)
-        _stop_token_id(llm)
+    _stop_basic(llm)
+    _stop_multi_tokens(llm)
+    _stop_partial_token(llm)
+    # FIXME: this does not respect include_in_output=False
+    # _stop_token_id(llm)

tests/v1/engine/test_processor_multi_modal_uuids.py

@@ -6,7 +6,6 @@ import pytest
 from vllm.assets.image import ImageAsset
 from vllm.assets.video import VideoAsset
 from vllm.config import CacheConfig, DeviceConfig, ModelConfig, VllmConfig
-from vllm.platforms.interface import UnspecifiedPlatform
 from vllm.sampling_params import SamplingParams
 from vllm.v1.engine import processor as processor_mod
 from vllm.v1.engine.processor import Processor
@@ -33,15 +32,6 @@ def _mk_processor(monkeypatch,
                         "__post_init__",
                         lambda self, *args: None,
                         raising=True)
-    monkeypatch.setattr(UnspecifiedPlatform,
-                        "is_async_output_supported",
-                        classmethod(lambda cls, enforce_eager: True),
-                        raising=True)
-    monkeypatch.setattr(
-        ModelConfig,
-        "verify_async_output_proc",
-        lambda self, parallel_config, speculative_config, device_config: None,
-        raising=True)
     monkeypatch.setattr(ModelConfig,
                         "verify_with_parallel_config",
                         lambda self, parallel_config: None,

tests/v1/test_oracle.py

@@ -29,24 +29,6 @@ def test_unsupported_configs(monkeypatch):
                 },
             ).create_engine_config()
 
-        with pytest.raises(NotImplementedError):
-            AsyncEngineArgs(
-                model=MODEL,
-                preemption_mode="swap",
-            ).create_engine_config()
-
-        with pytest.raises(NotImplementedError):
-            AsyncEngineArgs(
-                model=MODEL,
-                disable_async_output_proc=True,
-            ).create_engine_config()
-
-        with pytest.raises(NotImplementedError):
-            AsyncEngineArgs(
-                model=MODEL,
-                scheduler_delay_factor=1.2,
-            ).create_engine_config()
-
 
 def test_enable_by_default_fallback(monkeypatch):
     with monkeypatch.context() as m:

vllm/config/__init__.py

@@ -454,9 +454,6 @@ class VllmConfig:
         self.try_verify_and_update_config()
 
         if self.model_config is not None:
-            self.model_config.verify_async_output_proc(self.parallel_config,
-                                                       self.speculative_config,
-                                                       self.device_config)
             self.model_config.verify_with_parallel_config(self.parallel_config)
             self.model_config.verify_dual_chunk_attention_config(
                 self.load_config)
@@ -877,7 +874,6 @@ class VllmConfig:
             f"served_model_name={self.model_config.served_model_name}, "
             f"enable_prefix_caching={self.cache_config.enable_prefix_caching}, "
             f"chunked_prefill_enabled={self.scheduler_config.chunked_prefill_enabled}, "  # noqa
-            f"use_async_output_proc={self.model_config.use_async_output_proc}, "
             f"pooler_config={self.model_config.pooler_config!r}, "
             f"compilation_config={self.compilation_config!r}")
 

vllm/config/model.py

@@ -223,8 +223,6 @@ class ModelConfig:
     that this name(s) will also be used in `model_name` tag content of
     prometheus metrics, if multiple names provided, metrics tag will take the
     first one."""
-    use_async_output_proc: bool = True
-    """Whether to use async output processor."""
     config_format: Union[str, ConfigFormat] = "auto"
     """The format of the model config to load:\n
     - "auto" will try to load the config in hf format if available else it
@@ -1119,37 +1117,6 @@ class ModelConfig:
                 raise ValueError("please set VLLM_ATTENTION_BACKEND to "
                                  f"{STR_DUAL_CHUNK_FLASH_ATTN_VAL}")
 
-    def verify_async_output_proc(self, parallel_config, speculative_config,
-                                 device_config) -> None:
-        if not self.use_async_output_proc:
-            # Nothing to check
-            return
-
-        if parallel_config.pipeline_parallel_size > 1:
-            self.use_async_output_proc = False
-            return
-
-        # Reminder: Please update docs/features/compatibility_matrix.md
-        # If the feature combo become valid
-        from vllm.platforms import current_platform
-        if not current_platform.is_async_output_supported(self.enforce_eager):
-            self.use_async_output_proc = False
-            return
-
-        if envs.VLLM_USE_RAY_SPMD_WORKER:
-            self.use_async_output_proc = False
-            return
-
-        # Async postprocessor is not necessary for pooling models
-        # since there is no token generation
-        if self.runner_type == "pooling":
-            self.use_async_output_proc = False
-
-        # Reminder: Please update docs/features/compatibility_matrix.md
-        # If the feature combo become valid
-        if speculative_config:
-            self.use_async_output_proc = False
-
     def verify_with_parallel_config(
         self,
         parallel_config: ParallelConfig,
@@ -1173,15 +1140,12 @@ class ModelConfig:
             self._verify_with_expert_parallelism()
 
         pipeline_parallel_size = parallel_config.pipeline_parallel_size
-        if pipeline_parallel_size > 1:
-            if not self.registry.is_pp_supported_model(self.architectures,
-                                                       self):
-                raise NotImplementedError(
-                    "Pipeline parallelism is not supported for this model. "
-                    "Supported models implement the `SupportsPP` interface.")
-
-            if self.use_async_output_proc:
-                self.use_async_output_proc = False
+        if (pipeline_parallel_size > 1
+                and not self.registry.is_pp_supported_model(
+                    self.architectures, self)):
+            raise NotImplementedError(
+                "Pipeline parallelism is not supported for this model. "
+                "Supported models implement the `SupportsPP` interface.")
 
     def get_sliding_window(self) -> Optional[int]:
         """Get the sliding window size from the HF text config if present."""

vllm/config/scheduler.py

@@ -3,7 +3,7 @@
 
 import hashlib
 from dataclasses import field
-from typing import Any, Literal, Optional, Union
+from typing import Any, Literal, Union
 
 from pydantic import SkipValidation, model_validator
 from pydantic.dataclasses import dataclass
@@ -18,7 +18,6 @@ from vllm.utils import (DEFAULT_MAX_NUM_BATCHED_TOKENS,
 logger = init_logger(__name__)
 
 RunnerType = Literal["generate", "pooling", "draft"]
-PreemptionMode = Literal["swap", "recompute"]
 SchedulerPolicy = Literal["fcfs", "priority"]
 
 
@@ -78,10 +77,6 @@ class SchedulerConfig:
     3. more than one value (e.g. 1 2 128) is provided, then the capture list
     will follow the provided list."""
 
-    delay_factor: float = 0.0
-    """Apply a delay (of delay factor multiplied by previous
-    prompt latency) before scheduling next prompt."""
-
     enable_chunked_prefill: SkipValidation[bool] = None  # type: ignore
     """If True, prefill requests can be chunked based
     on the remaining max_num_batched_tokens."""
@@ -103,14 +98,6 @@ class SchedulerConfig:
     NOTE: This is not currently configurable. It will be overridden by
     max_num_batched_tokens in case max multimodal embedding size is larger."""
 
-    preemption_mode: Optional[PreemptionMode] = None
-    """Whether to perform preemption by swapping or
-    recomputation. If not specified, we determine the mode as follows:
-    We use recomputation by default since it incurs lower overhead than
-    swapping. However, when the sequence group has multiple sequences
-    (e.g., beam search), recomputation is not currently supported. In
-    such a case, we use swapping instead."""
-
     send_delta_data: bool = False
     """Private API. If used, scheduler sends delta data to
     workers instead of an entire data. It should be enabled only

vllm/engine/arg_utils.py

@@ -409,9 +409,7 @@ class EngineArgs:
         get_field(LoadConfig, "model_loader_extra_config")
     ignore_patterns: Optional[Union[str,
                                     List[str]]] = LoadConfig.ignore_patterns
-    preemption_mode: Optional[str] = SchedulerConfig.preemption_mode
 
-    scheduler_delay_factor: float = SchedulerConfig.delay_factor
     enable_chunked_prefill: Optional[
         bool] = SchedulerConfig.enable_chunked_prefill
     disable_chunked_mm_input: bool = SchedulerConfig.disable_chunked_mm_input
@@ -439,7 +437,6 @@ class EngineArgs:
         ObservabilityConfig.otlp_traces_endpoint
     collect_detailed_traces: Optional[list[DetailedTraceModules]] = \
         ObservabilityConfig.collect_detailed_traces
-    disable_async_output_proc: bool = not ModelConfig.use_async_output_proc
     scheduling_policy: SchedulerPolicy = SchedulerConfig.policy
     scheduler_cls: Union[str, Type[object]] = SchedulerConfig.scheduler_cls
 
@@ -561,14 +558,6 @@ class EngineArgs:
                                  **model_kwargs["enable_prompt_embeds"])
         model_group.add_argument("--served-model-name",
                                  **model_kwargs["served_model_name"])
-        # This one is a special case because it is the
-        # opposite of ModelConfig.use_async_output_proc
-        model_group.add_argument(
-            "--disable-async-output-proc",
-            action="store_true",
-            default=EngineArgs.disable_async_output_proc,
-            help="Disable async output processing. This may result in "
-            "lower performance.")
         model_group.add_argument("--config-format",
                                  **model_kwargs["config_format"])
         # This one is a special case because it can bool
@@ -897,10 +886,6 @@ class EngineArgs:
             **scheduler_kwargs["long_prefill_token_threshold"])
         scheduler_group.add_argument("--num-lookahead-slots",
                                      **scheduler_kwargs["num_lookahead_slots"])
-        scheduler_group.add_argument("--scheduler-delay-factor",
-                                     **scheduler_kwargs["delay_factor"])
-        scheduler_group.add_argument("--preemption-mode",
-                                     **scheduler_kwargs["preemption_mode"])
         # multi-step scheduling has been removed; corresponding arguments
         # are no longer supported.
         scheduler_group.add_argument("--scheduling-policy",
@@ -1029,7 +1014,6 @@ class EngineArgs:
             interleave_mm_strings=self.interleave_mm_strings,
             media_io_kwargs=self.media_io_kwargs,
             skip_mm_profiling=self.skip_mm_profiling,
-            use_async_output_proc=not self.disable_async_output_proc,
             config_format=self.config_format,
             mm_processor_kwargs=self.mm_processor_kwargs,
             mm_processor_cache_gb=self.mm_processor_cache_gb,
@@ -1395,11 +1379,9 @@ class EngineArgs:
             max_model_len=model_config.max_model_len,
             cuda_graph_sizes=self.cuda_graph_sizes,
             num_lookahead_slots=num_lookahead_slots,
-            delay_factor=self.scheduler_delay_factor,
             enable_chunked_prefill=self.enable_chunked_prefill,
             disable_chunked_mm_input=self.disable_chunked_mm_input,
             is_multimodal_model=model_config.is_multimodal_model,
-            preemption_mode=self.preemption_mode,
             send_delta_data=(envs.VLLM_USE_RAY_SPMD_WORKER
                              and parallel_config.use_ray),
             policy=self.scheduling_policy,
@@ -1492,22 +1474,6 @@ class EngineArgs:
                                recommend_to_remove=False)
             return False
 
-        if self.preemption_mode != SchedulerConfig.preemption_mode:
-            _raise_or_fallback(feature_name="--preemption-mode",
-                               recommend_to_remove=True)
-            return False
-
-        if (self.disable_async_output_proc
-                != EngineArgs.disable_async_output_proc):
-            _raise_or_fallback(feature_name="--disable-async-output-proc",
-                               recommend_to_remove=True)
-            return False
-
-        if self.scheduler_delay_factor != SchedulerConfig.delay_factor:
-            _raise_or_fallback(feature_name="--scheduler-delay-factor",
-                               recommend_to_remove=True)
-            return False
-
         # No Mamba or Encoder-Decoder so far.
         if not model_config.is_v1_compatible:
             _raise_or_fallback(feature_name=model_config.architectures,

vllm/entrypoints/llm.py

@@ -137,8 +137,6 @@ class LLM:
             back to the eager mode.
         disable_custom_all_reduce: See
             [ParallelConfig][vllm.config.ParallelConfig].
-        disable_async_output_proc: Disable async output processing.
-            This may result in lower performance.
         hf_token: The token to use as HTTP bearer authorization for remote files
             . If `True`, will use the token generated when running
             `huggingface-cli login` (stored in `~/.huggingface`).
@@ -188,7 +186,6 @@ class LLM:
         enforce_eager: bool = False,
         max_seq_len_to_capture: int = 8192,
         disable_custom_all_reduce: bool = False,
-        disable_async_output_proc: bool = False,
         hf_token: Optional[Union[bool, str]] = None,
         hf_overrides: Optional[HfOverrides] = None,
         mm_processor_kwargs: Optional[dict[str, Any]] = None,
@@ -286,7 +283,6 @@ class LLM:
             enforce_eager=enforce_eager,
             max_seq_len_to_capture=max_seq_len_to_capture,
             disable_custom_all_reduce=disable_custom_all_reduce,
-            disable_async_output_proc=disable_async_output_proc,
             hf_token=hf_token,
             hf_overrides=hf_overrides,
             mm_processor_kwargs=mm_processor_kwargs,

vllm/executor/uniproc_executor.py

@@ -137,10 +137,6 @@ class ExecutorWithExternalLauncher(UniProcExecutor):
     def _init_executor(self) -> None:
         """Initialize the worker and load the model.
         """
-        assert self.vllm_config.scheduler_config.delay_factor == 0.0, \
-            ("ExecutorWithExternalLauncher needs deterministic "
-            "execution, so it"
-            "does not support delay_factor in scheduling")
         if envs.VLLM_USE_V1:
             assert not envs.VLLM_ENABLE_V1_MULTIPROCESSING, \
             ("To get deterministic execution in V1, "

vllm/platforms/cpu.py

@@ -126,10 +126,6 @@ class CpuPlatform(Platform):
         """
         torch.cpu.set_device(device)
 
-    @classmethod
-    def is_async_output_supported(cls, enforce_eager: Optional[bool]) -> bool:
-        return False
-
     @classmethod
     def inference_mode(cls):
         return torch.no_grad()

vllm/platforms/cuda.py

@@ -96,16 +96,6 @@ class CudaPlatformBase(Platform):
     def get_device_total_memory(cls, device_id: int = 0) -> int:
         raise NotImplementedError
 
-    @classmethod
-    def is_async_output_supported(cls, enforce_eager: Optional[bool]) -> bool:
-        if enforce_eager and not envs.VLLM_USE_V1:
-            logger.warning(
-                "To see benefits of async output processing, enable CUDA "
-                "graph. Since, enforce-eager is enabled, async output "
-                "processor cannot be used")
-            return False
-        return True
-
     @classmethod
     def is_fully_connected(cls, device_ids: list[int]) -> bool:
         raise NotImplementedError

vllm/platforms/interface.py

@@ -275,13 +275,6 @@ class Platform:
         """Get the total memory of a device in bytes."""
         raise NotImplementedError
 
-    @classmethod
-    def is_async_output_supported(cls, enforce_eager: Optional[bool]) -> bool:
-        """
-        Check if the current platform supports async output.
-        """
-        raise NotImplementedError
-
     @classmethod
     def inference_mode(cls):
         """A device-specific wrapper of `torch.inference_mode`.

vllm/platforms/rocm.py

@@ -310,16 +310,6 @@ class RocmPlatform(Platform):
         device_props = torch.cuda.get_device_properties(device_id)
         return device_props.total_memory
 
-    @classmethod
-    def is_async_output_supported(cls, enforce_eager: Optional[bool]) -> bool:
-        if enforce_eager and not envs.VLLM_USE_V1:
-            logger.warning(
-                "To see benefits of async output processing, enable CUDA "
-                "graph. Since, enforce-eager is enabled, async output "
-                "processor cannot be used")
-            return False
-        return True
-
     @classmethod
     def check_and_update_config(cls, vllm_config: "VllmConfig") -> None:
         from vllm.config.compilation import CUDAGraphMode

vllm/platforms/tpu.py

@@ -75,10 +75,6 @@ class TpuPlatform(Platform):
     def get_device_total_memory(cls, device_id: int = 0) -> int:
         raise NotImplementedError
 
-    @classmethod
-    def is_async_output_supported(cls, enforce_eager: Optional[bool]) -> bool:
-        return False
-
     @classmethod
     def get_punica_wrapper(cls) -> str:
         return "vllm.lora.punica_wrapper.punica_tpu.PunicaWrapperTPU"

vllm/platforms/xpu.py

@@ -98,10 +98,6 @@ class XPUPlatform(Platform):
         device_props = torch.xpu.get_device_properties(device_id)
         return device_props.total_memory
 
-    @classmethod
-    def is_async_output_supported(cls, enforce_eager: Optional[bool]) -> bool:
-        return True
-
     @classmethod
     def inference_mode(cls):
         return torch.no_grad()