flagos-ai/vllm-FL：A high-throughput and memory-efficient inference and serving engine for LLMs

vLLM-FL is a fork of vLLM that introduces a plugin-based architecture for supporting diverse AI chips, built on top of FlagOS, a unified open-source AI system software stack.

Easy, fast, and cheap LLM serving for everyone

Join us at the PyTorch Conference, October 22-23 and Ray Summit, November 3-5 in San Francisco for our latest updates on vLLM and to meet the vLLM team! Register now for the largest vLLM community events of the year!

Latest News 🔥

[2025/08] We hosted vLLM Shenzhen Meetup focusing on the ecosystem around vLLM! Please find the meetup slides here.
[2025/08] We hosted vLLM Singapore Meetup. We shared V1 updates, disaggregated serving and MLLM speedups with speakers from Embedded LLM, AMD, WekaIO, and A*STAR. Please find the meetup slides here.
[2025/08] We hosted vLLM Shanghai Meetup focusing on building, developing, and integrating with vLLM! Please find the meetup slides here.
[2025/05] vLLM is now a hosted project under PyTorch Foundation! Please find the announcement here.
[2025/01] We are excited to announce the alpha release of vLLM V1: A major architectural upgrade with 1.7x speedup! Clean code, optimized execution loop, zero-overhead prefix caching, enhanced multimodal support, and more. Please check out our blog post here.

Previous News

[2025/08] We hosted vLLM Korea Meetup with Red Hat and Rebellions! We shared the latest advancements in vLLM along with project spotlights from the vLLM Korea community. Please find the meetup slides here.
[2025/08] We hosted vLLM Beijing Meetup focusing on large-scale LLM deployment! Please find the meetup slides here and the recording here.
[2025/05] We hosted NYC vLLM Meetup! Please find the meetup slides here.
[2025/04] We hosted Asia Developer Day! Please find the meetup slides from the vLLM team here.
[2025/03] We hosted vLLM x Ollama Inference Night! Please find the meetup slides from the vLLM team here.
[2025/03] We hosted the first vLLM China Meetup! Please find the meetup slides from vLLM team here.
[2025/03] We hosted the East Coast vLLM Meetup! Please find the meetup slides here.
[2025/02] We hosted the ninth vLLM meetup with Meta! Please find the meetup slides from vLLM team here and AMD here. The slides from Meta will not be posted.
[2025/01] We hosted the eighth vLLM meetup with Google Cloud! Please find the meetup slides from vLLM team here, and Google Cloud team here.
[2024/12] vLLM joins pytorch ecosystem! Easy, Fast, and Cheap LLM Serving for Everyone!
[2024/11] We hosted the seventh vLLM meetup with Snowflake! Please find the meetup slides from vLLM team here, and Snowflake team here.
[2024/10] We have just created a developer slack (slack.vllm.ai) focusing on coordinating contributions and discussing features. Please feel free to join us there!
[2024/10] Ray Summit 2024 held a special track for vLLM! Please find the opening talk slides from the vLLM team here. Learn more from the talks from other vLLM contributors and users!
[2024/09] We hosted the sixth vLLM meetup with NVIDIA! Please find the meetup slides here.
[2024/07] We hosted the fifth vLLM meetup with AWS! Please find the meetup slides here.
[2024/07] In partnership with Meta, vLLM officially supports Llama 3.1 with FP8 quantization and pipeline parallelism! Please check out our blog post here.
[2024/06] We hosted the fourth vLLM meetup with Cloudflare and BentoML! Please find the meetup slides here.
[2024/04] We hosted the third vLLM meetup with Roblox! Please find the meetup slides here.
[2024/01] We hosted the second vLLM meetup with IBM! Please find the meetup slides here.
[2023/10] We hosted the first vLLM meetup with a16z! Please find the meetup slides here.
[2023/08] We would like to express our sincere gratitude to Andreessen Horowitz (a16z) for providing a generous grant to support the open-source development and research of vLLM.
[2023/06] We officially released vLLM! FastChat-vLLM integration has powered LMSYS Vicuna and Chatbot Arena since mid-April. Check out our blog post.

About

vLLM is a fast and easy-to-use library for LLM inference and serving.

Originally developed in the Sky Computing Lab at UC Berkeley, vLLM has evolved into a community-driven project with contributions from both academia and industry.

vLLM is fast with:

State-of-the-art serving throughput
Efficient management of attention key and value memory with PagedAttention
Continuous batching of incoming requests
Fast model execution with CUDA/HIP graph
Quantizations: GPTQ, AWQ, AutoRound, INT4, INT8, and FP8
Optimized CUDA kernels, including integration with FlashAttention and FlashInfer
Speculative decoding
Chunked prefill

vLLM is flexible and easy to use with:

Seamless integration with popular Hugging Face models
High-throughput serving with various decoding algorithms, including parallel sampling, beam search, and more
Tensor, pipeline, data and expert parallelism support for distributed inference
Streaming outputs
OpenAI-compatible API server
Support for NVIDIA GPUs, AMD CPUs and GPUs, Intel CPUs and GPUs, PowerPC CPUs, and TPU. Additionally, support for diverse hardware plugins such as Intel Gaudi, IBM Spyre and Huawei Ascend.
Prefix caching support
Multi-LoRA support

vLLM seamlessly supports most popular open-source models on HuggingFace, including:

Transformer-like LLMs (e.g., Llama)
Mixture-of-Expert LLMs (e.g., Mixtral, Deepseek-V2 and V3)
Embedding Models (e.g., E5-Mistral)
Multi-modal LLMs (e.g., LLaVA)

Find the full list of supported models here.

Getting Started

Install vLLM with pip or from source:

pip install vllm

Visit our documentation to learn more.

Contributing

We welcome and value any contributions and collaborations. Please check out Contributing to vLLM for how to get involved.

Citation

If you use vLLM for your research, please cite our paper:

@inproceedings{kwon2023efficient,
  title={Efficient Memory Management for Large Language Model Serving with PagedAttention},
  author={Woosuk Kwon and Zhuohan Li and Siyuan Zhuang and Ying Sheng and Lianmin Zheng and Cody Hao Yu and Joseph E. Gonzalez and Hao Zhang and Ion Stoica},
  booktitle={Proceedings of the ACM SIGOPS 29th Symposium on Operating Systems Principles},
  year={2023}
}

Contact Us

For technical questions and feature requests, please use GitHub Issues
For discussing with fellow users, please use the vLLM Forum
For coordinating contributions and development, please use Slack
For security disclosures, please use GitHub’s Security Advisories feature
For collaborations and partnerships, please contact us at vllm-questions@lists.berkeley.edu

Media Kit

If you wish to use vLLM’s logo, please refer to our media kit repo

Purpose

Test Plan

Test Result