16337
745cadc8e7
- tensorrt_engine.py 工业级 Buffer Pool - preprocessor.py 添加 pad_to_batch4() - postprocessor.py 支持批量输出 - settings.py 固定 batch_size=4
395 lines
12 KiB
Python
395 lines
12 KiB
Python
"""
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TensorRT推理引擎模块
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固定 batch=4, FP16, 3×480×480
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工业级实现：Buffer Pool、异步推理、性能监控
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"""
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import logging
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import threading
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import time
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from typing import Any, Dict, List, Optional, Tuple
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import numpy as np
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try:
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import tensorrt as trt
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import pycuda.driver as cuda
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import pycuda.autoinit
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TRT_AVAILABLE = True
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except ImportError:
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TRT_AVAILABLE = False
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trt = None
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cuda = None
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from config.settings import get_settings, InferenceConfig
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from utils.logger import get_logger
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logger = logging.getLogger(__name__)
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class HostDeviceMem:
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"""Host/Device 内存对（工业级 Buffer Pool）"""
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def __init__(self, host_mem, device_mem):
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self.host = host_mem
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self.device = device_mem
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def __repr__(self):
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return f"Host:{self.host.shape}, Device:{int(self.device)}"
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def pad_to_batch4(frames: List[np.ndarray]) -> np.ndarray:
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"""
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Padding 到 batch=4，重复最后一帧
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Args:
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frames: list of [3, 480, 480] numpy arrays
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Returns:
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np.ndarray: [4, 3, 480, 480]
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"""
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if len(frames) == 0:
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raise ValueError("Empty frames list")
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if len(frames) == 4:
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return np.stack(frames)
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pad_frame = frames[-1].copy()
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while len(frames) < 4:
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frames.append(pad_frame)
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return np.stack(frames)
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class TensorRTEngine:
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"""固定 batch TensorRT 引擎 (batch=4, FP16, 3×480×480)
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特性：
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- Buffer Pool: bindings 只在 init 阶段分配一次
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- Pinned Memory: 使用 pagelocked host memory 提升 H2D/D2H 性能
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- Async API: CUDA stream + async memcpy + execute_async_v2
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"""
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BATCH_SIZE = 4
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INPUT_SHAPE = (3, 480, 480)
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def __init__(self, config: Optional[InferenceConfig] = None):
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if not TRT_AVAILABLE:
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raise RuntimeError("TensorRT 未安装，请先安装 tensorrt 库")
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if config is None:
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settings = get_settings()
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config = settings.inference
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self.config = config
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self._engine = None
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self._context = None
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self._stream = None
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self._released = False
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self._cuda_context = None
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self._logger = get_logger("tensorrt")
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self._lock = threading.Lock()
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self._bindings: List[int] = []
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self._inputs: List[HostDeviceMem] = []
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self._outputs: List[HostDeviceMem] = []
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self._performance_stats = {
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"inference_count": 0,
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"total_inference_time_ms": 0.0,
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"avg_inference_time_ms": 0.0,
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"throughput_fps": 0.0,
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"last_inference_time_ms": 0.0,
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}
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self._logger.info(
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f"TensorRT 引擎初始化: "
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f"{config.model_path}, "
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f"batch={self.BATCH_SIZE}, "
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f"shape={self.INPUT_SHAPE}, "
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f"fp16={config.fp16_mode}"
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)
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def load_engine(self, engine_path: Optional[str] = None) -> bool:
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"""加载 TensorRT engine 文件"""
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if engine_path is None:
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engine_path = self.config.model_path
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with self._lock:
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try:
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if self._context is not None:
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self._release_resources()
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self._cuda_context = cuda.Device(0).make_context()
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self._stream = cuda.Stream()
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TRT_LOGGER = trt.Logger(trt.Logger.WARNING)
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with open(engine_path, "rb") as f:
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runtime = trt.Runtime(TRT_LOGGER)
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self._engine = runtime.deserialize_cuda_engine(f.read())
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self._context = self._engine.create_execution_context()
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self._allocate_buffers()
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self._logger.log_connection_event(
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"load", "TensorRT", engine_path, True
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)
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self._logger.info(f"TensorRT 引擎加载成功: {engine_path}")
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self._logger.info(f" 输入: {len(self._inputs)}, 输出: {len(self._outputs)}, batch={self.BATCH_SIZE}")
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return True
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except Exception as e:
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self._logger.error(f"TensorRT 引擎加载失败: {e}")
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return False
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def _allocate_buffers(self):
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"""Buffer Pool: 初始化阶段一次性分配所有 bindings
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对于动态 shape engine，使用配置中的 batch_size 作为默认大小
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"""
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self._bindings = []
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self._inputs = []
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self._outputs = []
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for binding_idx in range(self._engine.num_bindings):
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shape = list(self._engine.get_binding_shape(binding_idx))
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dtype = trt.nptype(self._engine.get_binding_dtype(binding_idx))
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if shape[0] == -1:
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shape[0] = self.BATCH_SIZE
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shape = tuple(max(1, s) if s < 0 else s for s in shape)
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size = trt.volume(shape)
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try:
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host_mem = cuda.pagelocked_empty(size, dtype)
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except Exception as e:
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self._logger.warning(f"pagelocked memory 分配失败，回退到普通 numpy: {e}")
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host_mem = np.zeros(size, dtype=dtype)
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device_mem = cuda.mem_alloc(host_mem.nbytes)
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self._bindings.append(int(device_mem))
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mem_pair = HostDeviceMem(host_mem, device_mem)
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if self._engine.binding_is_input(binding_idx):
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self._inputs.append(mem_pair)
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else:
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self._outputs.append(mem_pair)
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if len(self._inputs) == 0:
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raise RuntimeError("No input bindings found")
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if len(self._outputs) == 0:
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raise RuntimeError("No output bindings found")
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def infer(self, input_batch: np.ndarray) -> Tuple[List[np.ndarray], float]:
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"""
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执行推理（工业级 async 模式）
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Args:
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input_batch: numpy 输入，shape = [batch, 3, 480, 480]，dtype = np.float16
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Returns:
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tuple: (输出列表, 推理耗时ms)
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"""
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if self._engine is None or self._context is None:
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raise RuntimeError("引擎未加载")
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if len(self._inputs) == 0:
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raise RuntimeError("未分配输入 buffer")
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batch_size = input_batch.shape[0]
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start_time = time.perf_counter()
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self._cuda_context.push()
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try:
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input_batch = np.ascontiguousarray(input_batch)
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input_name = self._engine.get_binding_name(0)
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actual_shape = list(input_batch.shape)
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self._context.set_input_shape(input_name, actual_shape)
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np.copyto(self._inputs[0].host, input_batch.ravel())
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cuda.memcpy_htod_async(
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self._inputs[0].device,
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self._inputs[0].host,
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self._stream
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)
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self._context.execute_async_v2(
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bindings=self._bindings,
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stream_handle=self._stream.handle
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)
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results = []
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for out in self._outputs:
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cuda.memcpy_dtoh_async(
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out.host,
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out.device,
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self._stream
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)
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results.append(out.host.copy())
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self._stream.synchronize()
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inference_time_ms = (time.perf_counter() - start_time) * 1000
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self._update_performance_stats(inference_time_ms, self.BATCH_SIZE)
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return results, inference_time_ms
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finally:
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self._cuda_context.pop()
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def _update_performance_stats(self, inference_time_ms: float, batch_size: int):
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"""更新性能统计"""
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stats = self._performance_stats
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stats["inference_count"] += 1
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stats["total_inference_time_ms"] += inference_time_ms
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stats["last_inference_time_ms"] = inference_time_ms
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stats["avg_inference_time_ms"] = (
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stats["total_inference_time_ms"] / stats["inference_count"]
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)
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total_time = stats["total_inference_time_ms"] / 1000.0
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if total_time > 0:
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stats["throughput_fps"] = stats["inference_count"] / total_time
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def get_performance_stats(self) -> Dict[str, Any]:
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"""获取性能统计"""
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stats = dict(self._performance_stats)
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stats["memory_usage"] = self.get_memory_usage()
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return stats
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def get_memory_usage(self) -> Dict[str, float]:
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"""获取显存使用情况"""
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try:
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import pynvml
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pynvml.nvmlInit()
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handle = pynvml.nvmlDeviceGetHandleByIndex(self.config.device_id)
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mem_info = pynvml.nvmlDeviceGetMemoryInfo(handle)
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pynvml.nvmlShutdown()
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return {
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"total_mb": mem_info.total / (1024 ** 2),
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"used_mb": mem_info.used / (1024 ** 2),
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"free_mb": mem_info.free / (1024 ** 2),
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}
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except Exception as e:
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self._logger.warning(f"获取显存信息失败: {e}")
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return {"total_mb": 0, "used_mb": 0, "free_mb": 0}
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def _release_resources(self):
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"""释放资源"""
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if self._cuda_context:
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try:
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self._cuda_context.pop()
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self._cuda_context.detach()
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except Exception:
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pass
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self._cuda_context = None
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if self._stream:
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try:
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self._stream.synchronize()
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except Exception:
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pass
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self._stream = None
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self._context = None
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self._engine = None
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self._bindings = []
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self._inputs = []
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self._outputs = []
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def release(self):
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"""释放引擎资源（幂等调用）"""
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with self._lock:
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if self._released:
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return
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self._released = True
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self._release_resources()
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self._logger.info("TensorRT 引擎资源已释放")
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def __del__(self):
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"""析构函数"""
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self.release()
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class EngineManager:
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"""引擎管理器类"""
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def __init__(self):
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self._engines: Dict[str, TensorRTEngine] = {}
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self._logger = get_logger("tensorrt")
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self._lock = threading.Lock()
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def load_engine(
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self,
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engine_id: str,
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engine_path: str,
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config: Optional[InferenceConfig] = None
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) -> bool:
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"""加载引擎"""
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with self._lock:
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if engine_id in self._engines:
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self._engines[engine_id].release()
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engine = TensorRTEngine(config)
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if engine.load_engine(engine_path):
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self._engines[engine_id] = engine
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self._logger.info(f"引擎已加载: {engine_id}")
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return True
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else:
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return False
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def get_engine(self, engine_id: str) -> Optional[TensorRTEngine]:
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"""获取引擎"""
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return self._engines.get(engine_id)
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def release_engine(self, engine_id: str):
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"""释放引擎"""
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with self._lock:
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if engine_id in self._engines:
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self._engines[engine_id].release()
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del self._engines[engine_id]
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self._logger.info(f"引擎已释放: {engine_id}")
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def release_all(self):
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"""释放所有引擎"""
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with self._lock:
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for engine_id in list(self._engines.keys()):
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self._engines[engine_id].release()
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self._engines.clear()
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self._logger.info("所有引擎已释放")
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def get_all_stats(self) -> Dict[str, Any]:
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"""获取所有引擎统计"""
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with self._lock:
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return {
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engine_id: engine.get_performance_stats()
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for engine_id, engine in self._engines.items()
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}
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def create_tensorrt_engine(
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engine_path: str,
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config: Optional[InferenceConfig] = None
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) -> TensorRTEngine:
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"""创建 TensorRT 引擎的便捷函数"""
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engine = TensorRTEngine(config)
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if engine.load_engine(engine_path):
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return engine
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else:
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raise RuntimeError(f"无法加载 TensorRT 引擎: {engine_path}")
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