Hetero-Paged-Infer: A High-Performance LLM Inference Engine Based on Rust, Integrating PagedAttention and Continuous Batching Techniques

AICL-Lab's open-source hetero-paged-infer is a high-performance LLM inference engine developed based on Rust. It integrates PagedAttention and continuous batching techniques, aiming to solve memory fragmentation and throughput bottleneck issues in LLM services. Leveraging Rust's advantages in memory safety and zero-cost abstractions, this engine supports heterogeneous computing environments and provides an efficient solution for production-grade LLM services.

With the widespread deployment of LLMs in practical applications, optimizing inference service performance has become a core challenge for AI infrastructure. Traditional systems face two major pain points: 1) Memory fragmentation (inefficient KV cache allocation due to dynamic changes in sequence length); 2) Throughput limitations (static batching fails to fully utilize GPU resources). AICL-Lab launched hetero-paged-infer precisely to address these issues, combining Rust's features with cutting-edge technologies to provide a high-performance inference solution.

PagedAttention Mechanism

Drawing on the virtual memory paging idea from operating systems, it divides KV cache into fixed-size "pages", eliminating memory fragmentation, improving utilization, and supporting dynamic expansion.

Continuous Batching

Breaking through the limitations of static batching, it allows dynamic addition of new requests or removal of completed requests. Combined with PagedAttention, it improves GPU utilization, reduces average waiting time and tail latency, and optimizes the online service experience.

Rust Language Advantages

Using Rust's ownership model and compile-time memory checks to ensure safety, zero-cost abstractions balance code expressiveness and performance, and its interoperability with CUDA is mature, enabling efficient GPU capability calls.

Heterogeneous Computing Support

The project name "hetero" reflects its support for heterogeneous environments: multi-GPU parallel load distribution, CPU-GPU collaborative offloading of computations, and support for INT8/INT4 low-precision quantization to reduce memory usage and accelerate inference.

hetero-paged-infer is suitable for various production scenarios:

• High-concurrency online services: Chatbots, intelligent customer service, etc. Continuous batching + PagedAttention improve carrying capacity;
• Long text generation: Document summarization, code generation, etc. Dynamic memory management handles the uncertainty of output length;
• Resource-constrained deployment: Quantization support and efficient memory management allow large models to run on devices with limited memory.

In the field of open-source LLM inference engines, hetero-paged-infer complements similar projects:

• Compared to vLLM (Python implementation): Rust code is superior in deployment safety and long-term stability;
• Compared to TensorRT-LLM (closed-source): Provides more open customization space;
• Compared to llama.cpp (CPU-first): More focused on GPU inference optimization.

In the future, hetero-paged-infer will evolve in the following directions: support for more model architectures (MoE, multimodal), deep integration with distributed inference frameworks, optimization for specific hardware (AMD GPU, Apple Silicon), and seamless integration with cloud-native orchestration systems. For developers and enterprises building their own LLM services, this engine is a high-performance solution worth paying attention to.