PPT-Multiprogramming

Readings Silberschatz Galvin Gagne Operating System Concepts 8 th edition Chapter 31 32 Example Lets say that you had a program that initialized the value of x to 0 and then incremented . We regard the problem as a twodimensional resource allo cation problem for which different algorithms are pro posed Results from simulation experiments indicate the performance that can be achieved in terms of fragmentation and throughput 1 The Prob The notation used explicitly associates a data structure shared by concurrent processes with operations de711ned on it This clari711es the meaning of programs and permits a large class of timedependent errors to be caught at compile time A combinati cmuedu Arun Iyengar Erich Nahum Adam Wierman IBM TJ Watson Research Center Yorktown Heights NY USA aruninahum usibmcom Abstract Schedulingprioritization of DBMS transactions is im portant for many applications that rely on database back ends A conven Need fault isolation between processes Someone else testing tcppr oxy on your machine Processes can consume more than available memory Dormant pr ocesses wating for event still have cor images brPage 2br Solution Address Spaces Give each program its Operating System Overview. Operating Systems:. Internals and Design Principles, 6/E. William Stallings. Operating System. A program that controls the execution of application programs. An interface between applications and hardware. A program that controls . and . supports . the usage of computer . systems. Usage. Users . of a computer system. :. . programs. - use memory, use CPU time, use I/O . . devices. . human . users. Presenter: Seema Saijpaul. CS – 533 : Concepts of Operating System. Author:. . Edsger. W. . Dijkstra. Technological. University, Eindhoven, Netherlands. WHY ?. Early Systems. Problems. CPU time is expensive. CPU is forced to run at speed of peripheral. 2 MultiprogrammingSystems From calendar:. Management of . CPU (scheduling) processes, memory. , . disk, and files. . Implications of concurrency. . Concurrent programming, including . interprocess. . communications . in distributed systems. . When there is a single program running in the CPU, it leads to the degradation of the CPU utilization.. Example: When a running program initiates an I/O operation, the CPU remain idle until the I/O operation is completed..