vllm-project/vllm · error · ValueError

Unknown execute method: {execute_method}

Error message

Unknown execute method: {execute_method}

What it means

Error "Unknown execute method: {execute_method}" thrown in vllm-project/vllm.

Source

Thrown at vllm/distributed/elastic_ep/elastic_execute.py:167

        self.worker_ref = weakref.ref(worker)
        self.reconfig_request = None
        self._staged_moe_quant_methods: dict[nn.Module, FusedMoEMethodBase] = {}
        self._async_executor = ThreadPoolExecutor(
            max_workers=1, thread_name_prefix="ElasticEPAsync"
        )
        self._async_future: Future[None] | None = None

    @property
    def worker(self):
        worker = self.worker_ref()
        if worker is None:
            raise RuntimeError("Worker has been garbage collected")
        return worker

    def execute(self, execute_method: str, *args, **kwargs):
        method = getattr(self, execute_method, None)
        if method is None:
            raise ValueError(f"Unknown execute method: {execute_method}")
        return method(*args, **kwargs)

    def start_async(self, execute_method: str, *args, **kwargs) -> str:
        if self._async_future is not None:
            raise RuntimeError("Another Elastic EP async method is active")
        if args and isinstance(args[0], ReconfigureDistributedRequest):
            self.reconfig_request = args[0]
        dp_rank = self.worker.vllm_config.parallel_config.data_parallel_rank
        done_key = f"eep_async/{execute_method}/{dp_rank}/{self.worker.rank}"
        self._async_future = self._async_executor.submit(
            self._run_async, execute_method, *args, **kwargs
        )
        self._async_future.add_done_callback(lambda _: self._mark_async_done(done_key))
        return done_key

    def _run_async(self, execute_method: str, *args, **kwargs) -> None:
        from vllm.platforms import current_platform

View on GitHub (pinned to c794754062)

Solutions

1. Use a supported Elastic EP execute method; the method name in the error is not recognized.

When it happens

Trigger: Raised at vllm/distributed/elastic_ep/elastic_execute.py:167 when validation fails: Unknown execute method. Typically triggered by an incompatible or incomplete vLLM configuration, an unsupported platform/backend combination, or a runtime resource/dependency that is missing.

Common situations: Commonly encountered at vllm/distributed/elastic_ep/elastic_execute.py:167 during vLLM startup/config validation or runtime setup when: (1) conflicting CLI flags or config fields are combined, (2) the current platform (CUDA/ROCm/CPU/XPU) or installed optional packages do not support the requested feature, or (3) a required value is absent or out of range. Resolve by correcting the configuration as described in the message, or by selecting a supported alternative.

AI-assisted analysis of vllm-project/vllm@c794754062 (2026-08-14). Data as JSON: /api/errors/f63062a4aa2e8124. Report an issue: GitHub.