计算机性能的天花板在硬件，当所以 CPU 满负荷运行真正应用任务时，性能最高。如果 CPU 空转或很多时间用于进程/线程等系统管理任务，性能自然会有损失。1999 年提出了The C10K problem: 在 1GHZ CPU，2GB RAM，1Gbps  以太网配置，大概 1200 美金的计算机硬件已经可以同时支持 10，000 客户的并发访问。所需的工作都在操作系统和应用软件层面。30 年过去了，可以做个历史回顾和现状分析。

This is a study note of the Akka Stream. It is based on the Stream documents and only covers basic concepts of stream creation, execution and management.

This is a study note of the Lagom framework. It is based on the Lagom documents.

This is a study note of the Akka persistence. It is based on the Akka persistence documents.

This is a study note of the Firebase Hosting and Cloud Firestore development. It is based on the Firebase Hosting docs and Cloud Firestore docs.

This is the note of the Akka actor development. It is based on the Akka Actors documents.

This is the note of the Akka actor concepts. It is based on the Akka General Concepts documents.