Kino：Ruby 4.0高性能Ractor网络服务器发布

Kino是专为Ruby 4.0及更高版本设计的高性能网络服务器，通过重新设计的Ractor并发特性在单个小进程内实现并行代码执行1。这一架构避免了Puma等传统Ruby服务器为每个处理核心fork独立进程带来的内存浪费问题1。

性能方面，Kino在8核服务器上相比Puma fork集群展现出显著优势：对于I/O轻型端点性能提升1.5至2倍，在纯CPU任务上快30%以上1。内存占用方面，简化基准测试中仅为Puma的七分之一，真实Rails应用场景下为四分之一1。相比自身的threaded线程模式，Ractor模式在处理CPU工作时快5倍以上1。

Kino支持Rack 3应用和Rails框架，并在threaded回退模式下提供稳定性保障1。该服务器内置生产级功能，包括graceful drain、crash supervision和respawn、受限队列与503背压处理以及请求超时控制1。默认配置兼容Puma风格的workers×threads拓扑和配置DSL1。值得注意的是，虽然Ractor在Ruby 4.0中仍属官方实验性功能，但Kino的threaded模式已达到稳定状态1。

Kino is a new web server designed for Ruby 4.0 and later that leverages the redesigned Ractor feature to achieve significant performance and memory efficiency gains 1. By executing parallel code within a single lightweight process, Kino eliminates the memory overhead associated with traditional Ruby servers like Puma, which fork separate processes for each processor core 1. On an eight-core server, Kino's Ractor mode outperforms Puma's fork cluster by 1.5 to 2 times on I/O-light endpoints and over 30 percent on pure CPU tasks, while consuming only one-seventh to one-quarter of Puma's memory footprint 1.

The server includes production-ready features such as graceful drain, crash supervision with respawn capabilities, bounded queues with 503 backpressure responses, and request timeouts 1. Kino maintains compatibility with Rack 3 applications and supports Rails through a threaded fallback mode, while offering a Puma-compatible configuration interface with a workers-by-threads topology and configuration DSL 1. Although Ractors remain an official experimental feature in Ruby 4.0, Kino's threaded mode provides a stable alternative 1. In CPU-intensive workloads, Kino's Ractor mode significantly outperforms its own GVL-bound threaded mode by a factor exceeding five times 1.