mirror of
https://git.datalinker.icu/vllm-project/vllm.git
synced 2025-12-19 05:05:02 +08:00
89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
"""Code inside this file can safely assume cuda platform, e.g. importing
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pynvml. However, it should not initialize cuda context.
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"""
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import os
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from functools import lru_cache, wraps
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from typing import Callable, List, Tuple, TypeVar
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import pynvml
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from typing_extensions import ParamSpec
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from vllm.logger import init_logger
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from .interface import Platform, PlatformEnum
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logger = init_logger(__name__)
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_P = ParamSpec("_P")
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_R = TypeVar("_R")
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# NVML utils
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# Note that NVML is not affected by `CUDA_VISIBLE_DEVICES`,
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# all the related functions work on real physical device ids.
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# the major benefit of using NVML is that it will not initialize CUDA
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def with_nvml_context(fn: Callable[_P, _R]) -> Callable[_P, _R]:
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@wraps(fn)
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def wrapper(*args: _P.args, **kwargs: _P.kwargs) -> _R:
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pynvml.nvmlInit()
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try:
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return fn(*args, **kwargs)
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finally:
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pynvml.nvmlShutdown()
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return wrapper
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@lru_cache(maxsize=8)
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@with_nvml_context
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def get_physical_device_capability(device_id: int = 0) -> Tuple[int, int]:
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handle = pynvml.nvmlDeviceGetHandleByIndex(device_id)
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return pynvml.nvmlDeviceGetCudaComputeCapability(handle)
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def device_id_to_physical_device_id(device_id: int) -> int:
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if "CUDA_VISIBLE_DEVICES" in os.environ:
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device_ids = os.environ["CUDA_VISIBLE_DEVICES"].split(",")
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physical_device_id = device_ids[device_id]
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return int(physical_device_id)
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else:
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return device_id
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class CudaPlatform(Platform):
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_enum = PlatformEnum.CUDA
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@staticmethod
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def get_device_capability(device_id: int = 0) -> Tuple[int, int]:
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physical_device_id = device_id_to_physical_device_id(device_id)
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return get_physical_device_capability(physical_device_id)
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@staticmethod
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@with_nvml_context
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def is_full_nvlink(physical_device_ids: List[int]) -> bool:
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"""
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query if the set of gpus are fully connected by nvlink (1 hop)
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"""
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handles = [
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pynvml.nvmlDeviceGetHandleByIndex(i) for i in physical_device_ids
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]
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for i, handle in enumerate(handles):
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for j, peer_handle in enumerate(handles):
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if i < j:
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try:
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p2p_status = pynvml.nvmlDeviceGetP2PStatus(
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handle, peer_handle,
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pynvml.NVML_P2P_CAPS_INDEX_NVLINK)
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if p2p_status != pynvml.NVML_P2P_STATUS_OK:
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return False
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except pynvml.NVMLError as error:
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logger.error(
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"NVLink detection failed. This is normal if your"
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" machine has no NVLink equipped.",
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exc_info=error)
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return False
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return True
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