Basic Concepts:CPU-I/O Burst Cycle oA property of process: CPU-1/O Burst Cycle Process execution consists of a load store cycle of CPU execution and I/O add store CPU burst read from file wait Alternating Sequence of CPU And wait for I/O I/O burst 1/O Bursts store increment index CPU burst o Begin and end with a CPU burst write to file ●Process execution wait for l/O l/O burst n(CPU execution l/O wait) load store +CPU execution add store CPU burst read from file wait for I/O 1/O burst EDao 陈话兰xlanchen@ustc.edu:cn http/staff.uO1174O1 Operating System操作系统原理 March27,20198/68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Basic Concepts: CPU-I/O Burst Cycle A property of process : CPU-I/O Burst Cycle Process execution consists of a cycle of CPU execution and I/O wait Alternating Sequence of CPU And I/O Bursts Begin and end with a CPU burst Process execution = n (CPU execution + I/O wait) + CPU execution ... load store add store read from file wait for I/O store increment index write to file wait for I/O load store add store read from file wait for I/O ... CPU burst I/O burst CPU burst I/O burst CPU burst I/O burst 陈香兰 xlanchen@ustc.edu.cn http://staff.ustc.edu.cn/~xlanchen (Computer Application Laboratory, CS, USTC @ Hefei Embedded System Laboratory, CS, USTC @ Suzhou) 0117401: Operating System 操作系统原理与设计 March 27, 2019 8 / 68