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15. Computer Systems Basic Software 1
- 1. Part2: Computer Systems Chapter 2: Basic Software (Text No. 1 Chapter 3)
- 4. Operating System Position Application software Operating system Hard ware Application
- 5. Operating System “ A set of system software routines that sits between the application program and the hardware. ” User Application program Hardware Operating system
- 8. OS Configuration and Functions OS role Efficient use of resources Consecutive job processing Multiple programming Reduction of the response Improvement of reliability
- 15. OS Functions
- 19. JCL
- 23. Print Spooling print queue print spooler print job jobs to be printed jobs being printed server laser printer disk
- 25. Job Scheduling
- 45. Priority Scheduling 5 1 P4 5 2 1 10 Burst Time 9 P3 2 P5 4 P2 8 P1 Priority Process
- 71. Deadlock
- 75. Fragmentation NEW NEW Defragmentation / Compaction Variable partitions Control Program Unused Program
- 77. Swapping NEW NEW NEW Variable partitions Control Program Unused Program
- 80. Overlay Program segments Memory Segment Segment
- 89. DAT
Hinweis der Redaktion
- Text Page 92 (Figure 3-1-2) Reading 1
- JCL Function of Job Management is to decode and execute these detailed instructions written in the JCL SPOOL An indispensable function in multi-programming environments Job Scheduling executed by the job scheduler using a dedicated program incorporated in the OS
- The buffer provides a waiting station where data can rest while the slower device catches up
- Execution Control State Transition Processor becomes free when the process being executed turns into the wait status Execute other process during this time – multiple process (multitasking)
- Preemption: Once the time has expired, the processor is interrupted to let another process with the same priority to access the processor. If a second process with higher priority is ready to execute, the OS interrupts the current executing process to the process with higher priority Round robin: Once time is up, execution halted and process is sent to last position in process queue
- User process calls on the OS to perform some function requiring privileged instructions. Done by means of a supervisor call (SVC) or system call An interruption occurs An error condition occurs in a user process (program interrupt)
- Refer to Text Page 102
- Paging Exchange of programs between main storage unit and auxiliary storage device (Refer to Text Page 103 Figure 3-1-18) Address Translation Issue often arises when paging is performed is that the page-in address of the main storage unit is unknown (Refer to Text Page 104 Figure 3-1-19) Segmentation Paging (Refer to Text Page 104 Figure 3-1-20) Page Replacement Least Recently Used (LRU) Method Fist-in First-out) FIFO Method