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tensorrt-llm

Set up and optimize large language model inference, or response generation, on NVIDIA GPUs. Use quantization, batch processing, and multiple GPUs to improve serving performance, and expose models through a chat completion API.

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High-throughput LLM inference on NVIDIA GPUs.

集成工具DockerHugging Face
查看安装方法

适用场景

  • Serving a language model through a chat completion API
  • Processing many prompts in batches
  • Configuring quantization to reduce memory use
  • Distributing a large model across multiple GPUs

包含的文件(4)

  • SKILL.md4.9 KB
  • references/multi-gpu.md6.5 KB
  • references/optimization.md5.5 KB
  • references/serving.md9.6 KB

SKILL.md(原文)

安装前可以查看交给 AI 代理的指令内容。

TensorRT-LLM

NVIDIA's open-source library for optimizing LLM inference with high performance on NVIDIA GPUs.

When to use TensorRT-LLM

Use TensorRT-LLM when:

  • Deploying on NVIDIA GPUs (A100, H100, GB200)
  • Need maximum throughput (24,000+ tokens/sec on Llama 3)
  • Require low latency for real-time applications
  • Working with quantized models (FP8, INT4, FP4)
  • Scaling across multiple GPUs or nodes

Use vLLM instead when:

  • Need simpler setup and Python-first API
  • Want PagedAttention without TensorRT compilation
  • Working with AMD GPUs or non-NVIDIA hardware

Use llama.cpp instead when:

  • Deploying on CPU or Apple Silicon
  • Need edge deployment without NVIDIA GPUs
  • Want simpler GGUF quantization format

Quick start

Installation

# Docker (recommended) — images are on NGC (nvcr.io), not Docker Hub.
# Replace x.y.z with the desired version (e.g. 1.2.1). Browse tags on NGC:
# https://catalog.ngc.nvidia.com/orgs/nvidia/teams/tensorrt-llm/containers/release/tags
docker pull nvcr.io/nvidia/tensorrt-llm/release:x.y.z

# pip install (current stable GA)
pip install tensorrt_llm

# Requires CUDA 13.2.1, TensorRT 10.x, Python 3.10-3.12

Basic inference

from tensorrt_llm import LLM, SamplingParams

# Initialize model
llm = LLM(model="meta-llama/Meta-Llama-3-8B")

# Configure sampling
sampling_params = SamplingParams(
    max_tokens=100,
    temperature=0.7,
    top_p=0.9
)

# Generate
prompts = ["Explain quantum computing"]
outputs = llm.generate(prompts, sampling_params)

for output in outputs:
    print(output.text)

Serving with trtllm-serve

# Start server (automatic model download and compilation)
# Tensor parallelism across 4 GPUs
trtllm-serve meta-llama/Meta-Llama-3-8B \
    --tp_size 4 \
    --max_batch_size 256 \
    --max_num_tokens 4096

# Client request
curl -X POST http://localhost:8000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "meta-llama/Meta-Llama-3-8B",
    "messages": [{"role": "user", "content": "Hello!"}],
    "temperature": 0.7,
    "max_tokens": 100
  }'

Key features

Performance optimizations

  • In-flight batching: Dynamic batching during generation
  • Paged KV cache: Efficient memory management
  • Flash Attention: Optimized attention kernels
  • Quantization: FP8, INT4, FP4 for 2-4× faster inference
  • CUDA graphs: Reduced kernel launch overhead

Parallelism

  • Tensor parallelism (TP): Split model across GPUs
  • Pipeline parallelism (PP): Layer-wise distribution
  • Expert parallelism: For Mixture-of-Experts models
  • Multi-node: Scale beyond single machine

Advanced features

  • Speculative decoding: Faster generation with draft models
  • LoRA serving: Efficient multi-adapter deployment
  • Disaggregated serving: Separate prefill and generation

Common patterns

Quantized model (FP8)

from tensorrt_llm import LLM

# Load FP8 quantized model (2× faster, 50% memory)
llm = LLM(
    model="meta-llama/Meta-Llama-3-70B",
    dtype="fp8",
    max_num_tokens=8192
)

# Inference same as before
outputs = llm.generate(["Summarize this article..."])

Multi-GPU deployment

# Tensor parallelism across 8 GPUs
llm = LLM(
    model="meta-llama/Meta-Llama-3-405B",
    tensor_parallel_size=8,
    dtype="fp8"
)

Batch inference

# Process 100 prompts efficiently
prompts = [f"Question {i}: ..." for i in range(100)]

outputs = llm.generate(
    prompts,
    sampling_params=SamplingParams(max_tokens=200)
)

# Automatic in-flight batching for maximum throughput

Performance benchmarks

Meta Llama 3-8B (H100 GPU):

  • Throughput: 24,000 tokens/sec
  • Latency: ~10ms per token
  • vs PyTorch: 100× faster

Llama 3-70B (8× A100 80GB):

  • FP8 quantization: 2× faster than FP16
  • Memory: 50% reduction with FP8

Supported models

  • LLaMA family: Llama 2, Llama 3, CodeLlama
  • GPT family: GPT-2, GPT-J, GPT-NeoX
  • Qwen: Qwen, Qwen2, QwQ
  • DeepSeek: DeepSeek-V2, DeepSeek-V3
  • Mixtral: Mixtral-8x7B, Mixtral-8x22B
  • Vision: LLaVA, Phi-3-vision
  • 100+ models on HuggingFace

References

Resources

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