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Berth: A Unified Multi-Backend Control Plane for Large Model Inference, Simplifying Deployment Complexity

Berth is a single-node inference control plane that provides an OpenAI-compatible API, supports multiple inference backends like vLLM, SGLang, and TensorRT-LLM, and simplifies the deployment and management of large models.

Berth推理引擎vLLMSGLangTensorRT-LLMOpenAI API控制平面大模型部署推理优化
Published 2026-05-20 23:44Recent activity 2026-05-20 23:53Estimated read 6 min
Berth: A Unified Multi-Backend Control Plane for Large Model Inference, Simplifying Deployment Complexity
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Section 01

[Main Floor/Introduction] Berth: A Unified Multi-Backend Control Plane for Large Model Inference

Berth is a single-node inference control plane that provides an OpenAI-compatible API and supports multiple inference backends such as vLLM, SGLang, and TensorRT-LLM. It aims to address the challenges of choice difficulty and management complexity caused by backend fragmentation in large model inference deployment, simplifying the deployment and management processes.

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Section 02

Background: The Dilemma of Fragmented Inference Backends

Deploying large language model inference faces complex engineering challenges. vLLM (high throughput with PagedAttention technology), SGLang (structured generation and efficient KV caching), and TensorRT-LLM (extreme performance via NVIDIA's underlying optimizations) each have their own advantages, but they lead to choice difficulties and management complexity. Berth was created precisely to address this pain point.

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Section 03

Core Value: The Role of the Control Plane

As an inference control plane, Berth applies the concept of a "control plane" from distributed systems and provides an intelligent abstraction layer. Its values include: 1. Backend agnosticism (developers interface with the OpenAI API without needing to care about the underlying engine; switching only requires changing configurations); 2. Flexible scheduling (routing to the appropriate backend based on tasks/scenarios); 3. Simplified operation and maintenance (centralized monitoring, logging, and configuration management).

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Section 04

Detailed Explanation of Supported Mainstream Inference Backends

Berth currently supports three mainstream engines:

  • vLLM: An open engine with efficient memory management via PagedAttention, suitable for high-concurrency online services, with active community support for a wide range of models;
  • SGLang: Developed by Berkeley, focusing on structured generation and complex workflows, supporting advanced features like constrained decoding, ideal for precise output control;
  • TensorRT-LLM: Launched by NVIDIA, deeply optimized for GPU performance based on TensorRT, suitable for production environments pursuing low latency and high throughput.
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Section 05

The Significance of OpenAI-Compatible API

Berth chooses the OpenAI API as its unified interface (a de facto industry standard). Its significance for developers includes:

  1. Zero-cost migration of existing applications to self-hosted models;
  2. Compatibility with a rich ecosystem of tools (LangChain, LlamaIndex, etc.);
  3. Flexible switching of model sources (using OpenAI for development verification, switching to self-hosted open-source models for production).
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Section 06

Deployment Architecture and Typical Use Cases

Berth adopts a single-node design, making deployment simple and suitable for small to medium-scale needs. Typical use cases:

  • Development and testing environments: Quickly try out different backends;
  • Small to medium-scale production deployments: Retain the flexibility to switch backends;
  • Model evaluation: Fairly compare the performance of different backends;
  • Progressive migration: Smoothly transition backends without service interruption.
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Section 07

Key Challenges in Technical Implementation

Key challenges involved in Berth's implementation:

  1. Request routing: Distribute requests to the correct backend based on models/parameters, requiring a flexible configuration system;
  2. Response format conversion: Unify outputs from different backends into the OpenAI format;
  3. Streaming response support: Proxy backend streaming outputs to ensure low latency;
  4. Error handling and degradation: Gracefully handle backend failures or automatically switch to backups.
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Section 08

Conclusion: A Step Towards Standardization of Inference Infrastructure

Berth represents the evolution direction of large model inference infrastructure towards standardization and modularization. Through a unified control plane, it allows developers to focus on application logic rather than backend complexity. We look forward to more similar projects to jointly build a robust and easy-to-use AI development environment—Berth is a valuable contribution to this trend.