A real-time operating system(RTOS)is an operating system intended to serve( )application process data as it comes in,typically without buffering delays. A key( )of a RTOS is the level of its consistency concerning the amount of time it takes to accept and complete an application’s task;the variability is jitter. A hard real-time operating system has( )jitter than a soft real-time operating system. The chief design goal is not high throughput, but rather a guarantee of a soft or hard performance category. A RTOS has an advanced algorithm for scheduling.( ) flexibility enables a wider, computer-system orchestration of process priorities, but a real-time OS is more frequently dedicated to a narrow set of aplications. Key factors in a real-time OS are minimal( )latency and minimal thread switching latency.
第 1 问
A. normal
B. real-time
C. user
D. kernel
第 2 问
A. characteristic
B. programming
C. structure
D. computer
第 3 问
A. equal
B. more
C. less
D. much
第 4 问
A. Scheduler
B. Programming
C. Network
D. User
第 5 问
A. language
B. network
C. interrupt
D. computer
下面是路由表的4个表项,与地址220.112.179.92匹配的表项是( )。
A. 220.112.145.32/22
B. 220.112.145.64/22
C. 220.112.147.64/22
D. 220.112.177.64/22
以下协议中属于应用层协议的是( ),该协议的报文封装在( )中传送。
第 1 问
A. SNMP
B. ARP
C. ICMP
D. X.25
第 2 问
A. TCP
B. IP
C. UDP
D. ICMP
文件系统中,打开文件(open)操作的功能是( )。
A. 把文件信息从辅存读到内存
B. 把磁盘的超级块从辅存读到内存
C. 把文件的FAT表信息从辅存读到内存
D. 把文件的控制管理信息从辅存读到内存
基线是一组经过正式验证或确认,并作为后续工作开展依据的一个或一组工作产品,软件项目至少应形成功能基线、分配基线和产品基线三类基线。功能基线形成的时机是( )。
A. 在系统分析与软件定义阶段结束时
B. 在需求分析阶段结束时
C. 在软件设计阶段结束时
D. 在综合测试阶段结束时
从信息流的传送效率来看,( )工作效率最低;从吞吐量来看,( )最强。
第 1 问
A. 三总线系统
B. 单总线系统
C. 双总线系统
D. 多总线系统
第 2 问
A. 三总线系统
B. 单总线系统
C. 双总线系统
D. 多总线系统