内核级并发通信的研究

提出了一种内核级并发消息通信机制。该机制采用对象传送协议和动态线程池技术,并通过会话控制完成数据的收发过程,将线程池设计为二级阻塞队列来暂缓线程的撤销过程,从而保证既能够快速响应客户请求,又可减少因频繁创建和撤销线程而消耗系统的资源和时间,为分布式操作系统提供了高效可靠的通信服务。

分布式并行服务器中的高性能通信研究

基于快速以太局网中分布式并行服务器通信特点和对网络协议栈的分析,设计并实现了一种分布式操作系统传输协议。该协议在维持通用编程接口的同时,精简网络协议栈底层的冗余操作,减少操作系统干预和协议自维护开销。在8个节点的服务器系统上的测试结果表明,分布式操作系统传输协议获得比用户数据报协议更小的往返延迟和系统开销,应用环境下有约20%的增益,能有力地支持系统扩展和大并发访问服务。

Design and Implement an Novel File Access Prediction Model in Linux

So far, file access prediction models is mainly based on either the file access frequency or the historical record of the latest access. In this paper, a new file access prediction model called frequency- and recency-based successor (FRS) is presented which combines the advantages of the file frequency with the historical record. FRS model has the capability of rapid response to workload changes and can predict future events with greater accuracy than most of other prediction models. To evaluate the performance of FRS mode, the Linux kernel is modified to predict and prefetch upcoming accesses. The experiment shows that FRS can accurately predict approximately 80% of all file access events, while maintaining an immediate successor queue (ISQ) per-file which only requires regular dynamic updates.

开对你的窗

美籍华人、著名的心理学家李恕信在《潇洒的母亲》一书中讲到了这样一则故事:某镇上住着一个小女孩。一天,她打开窗户,正巧看见邻居在宰杀一条狗。那条狗,平时经常和小女孩在一起嬉戏,可邻居为了一顿丰盛的午餐,竟然对它下了毒手。小女孩看着那悲惨的场面,情不自禁地流了一脸的泪。连续几天,小女孩都沉浸在悲痛之中,她的母亲见状,便把小女孩领到另一个房间,打开了另一扇窗户。窗外,是一片美丽的花园。那里,阳光明媚,鲜花五彩缤纷,姹紫嫣红,争奇斗艳,芳香扑鼻,蝴蝶和蜜蜂在花间嬉戏,几只可爱的小鸟落在花园的栅栏上,开心地唱着歌。