Apache Benchmark Tool
ab is a tool for benchmarking your Apache Hypertext Transfer Protocol (HTTP) server. It is designed to give you an impression of how your current Apache installation performs. This especially shows you how many requests per second your Apache installation is capable of serving.
ab 是 apache http server 基准测试工具，它可以帮助我们去了解当前服务的表现，如每秒请求数等。下面是 ab 对应的所有 options 摘要信息：