MEANS:基于微线程结构的网络服务器

MEANS:A Micro-thrEad Architecture for Network Servers

Internet应用需要高性能的网络服务器体系结构.提出MEANS结构,这是一种针对Internet应用的网络服务器软件体系结构.通过引入一种新的线程抽象——微线程,MEANS向上层的程序员提供微线程环境,并通过传统线程并发访问下层操作系统的服务,而微线程的管理和调度则使用事件驱动机制,从而综合多线程和事件驱动结构的各自优点.此外,MEANS还具备通用性、扩展性、健壮性和适应性.经初步验证,在并发策略方面,MEANS具有相似于事件驱动结构的特性;在I/O策略方面,MEANS具有比多线程结构更好的I/O访问特性.

Internet applications require high-performance network server architecture.The authors propose a software architecture for network servers,MEANS（micro-thread architecture for network server）,which aims at supporting Internet applications.By introducing a new thread abstract,micro-thread,MEANS upwardly provides a multi-micro-thread environment to programmers,and downwardly accesses the OS services concurrently with traditional threads.MEANS adopts the event-driven mechanism to manage and schedule the micro-threads,which takes advantages of both multi-threaded and event-driven architecture.Moreover,MEANS is general purpose,scalable,robust and adaptable.By preliminary evaluation,in the terms of the concurrence policy,MEANS is similar to the event-driven architecture and outperforms the multi-threaded architecture in I O accessing.In particular,when the accessed file set is stored in the memory,the throughput of Hammer（2） server based on MEANS is 37.22% more than Apache based on multi-thread architecture,and 34.88% more than LightTPD based on single thread event-driven architecture,and 35.56% more than flash based on AMPED architecture,and is equal with Haboob based on SEDA architecture.While the accessed file set is stored on the hard disk,Hammer（2） increases the throughput by 191.35% compared with Apache,and 131.3% compared with LightTPD,and 904.16% compared with flash,and 45.6% compared with Haboob.