Why Vivo Chose Rust for BlueOS: Insights from a Ground‑Breaking OS Interview

Preface

BlueOS is Vivo’s intelligent operating system designed for the era of general artificial intelligence. From its kernel to the system framework, the entire stack is written in Rust, offering inherent intelligence, smoothness, and security. After its initial release on smart watches in 2023, the fully Rust‑based stack was open‑sourced in July 2024.

Q: Why was Rust chosen for BlueOS?

A: The project required a language that could provide both memory safety and C‑level performance. After extensive research and testing, Rust was selected as the technical foundation because it meets both criteria.

Q: Most of the industry uses C/C++. Did you encounter resistance when adopting Rust?

A: Yes, the resistance was significant. Rust’s steep learning curve, strict compile‑time checks, and the relative scarcity of mature documentation and case studies compared to C/C++ made the transition challenging. Concerns about the language’s maturity and industry adoption also arose.

Q: What are the biggest advantages of using Rust for BlueOS?

A: Rust delivers high reliability and stability—modules rarely crash, encounter null pointers, or leak memory. Performance is close to C/C++ (about 0.95× of C), surpassing expectations. Moreover, Rust’s compile‑time safety checks reduce bugs by two‑thirds and cut maintenance costs by over 50%.

Q: What was the most difficult part of learning Rust, and how did you overcome it?

A: The borrow checker, ownership system, and lifetime management were the toughest hurdles. Overcoming them required disciplined practice, building small projects, studying the official Rust book, and leveraging AI tools for assistance.

Q: What was your first impression of Rust, and any interesting anecdotes?

A: Rust felt like a “fusion monster”—a low‑level language with many modern features such as Cargo for dependency management. The comprehensive documentation and real‑time compiler updates made problem‑solving enjoyable, often turning debugging into a fun challenge.

Q: After extensive use, how would you evaluate Rust?

A: Rust provides a perfect balance of safety and performance, essential for system‑level development. Its modern features (async, closures, powerful macro system) boost productivity, though the steep learning curve and still‑growing ecosystem can be drawbacks. Cargo’s support for massive OS projects is limited, and binary sizes can be larger than C++ equivalents.