Operating Systems - David Vernon

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Processes Process Scheduling – Guaranteed Scheduling » Decide what proportion of CPU time each process should get (e.g. equal share) » Schedule processes to ensure this happens (e.g. by scheduling those processes who have current accumulated CPU time below their assigned level) Copyright © 2007 David Vernon (www.vernon.eu)
Processes Process Scheduling – Two Level Scheduling » What if not all runnable processes are in memory (some might have been swapped out to disk)? » The context switch time for a swapped process is orders of magnitude longer than that of a process in memory » Solution: use two schedulers: high-level scheduler decides which processes should be memory-resident and which should be swapped to disk (i.e. it schedules memory) low-level scheduler runs/suspends memory resident processes Copyright © (i.e. 2007 David it schedules Vernon (www.vernon.eu) CPU time)
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Operating Systems David Vernon Copy
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Course Content Historical overview
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Course Content Device management -
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Course Content Networking issues -
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Course Textbook “Modern Operating
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Assessment of Performance First exa
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The Need for Operating Systems Why
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The Need for Operating Systems Comp
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The Need for Operating Systems Exam
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Load B DR ← M(AR) A B C 11111111
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Load B Increment PC A B C 11111111
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Load B AR ← DR(address) A B C 111
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Load B AC ← DR A B 11111111 01001
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The Need for Operating Systems Mach
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What is an Operating System There a
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What is an Operating System OS as a
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History of Operating Systems First
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History of Operating Systems Second
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History of Operating Systems Third
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History of Operating Systems Third
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History of Operating Systems Fourth
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Operating System Concepts System ca
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Operating System Concepts Processes
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Operating System Concepts Files - O
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Operating System Concepts Copyright
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Operating System Concepts Files -Pr
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Operating System Concepts Files - O
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Operating System Concepts System Ca
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Operating System Concepts The Shell
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Operating System Structure Monolith
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Operating System Structure Monolith
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Operating System Structure Virtual
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Operating System Structure Virtual
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Operating System Structure Client-S
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Operating System Structure Client-S
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Processes All modern computer syste
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Processes Single program counter Fo
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Processes Because the OS schedules
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Processes Process Hierarchies - pro
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Processes Running 1 Blocked 4 3 2 R
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Processes Device I/O … the differ
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Processes Interrupts and device I/
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Processes InterProcess Communicatio
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Processes Process A Spooler directo
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Processes Process A Process B Print
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Processes /* process 0 */ main () {
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Processes /* process 0 */ main () {
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while (turn == process && intereste
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Memory Management Virtual Memory -
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Memory Management Segmentation - Th
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Memory Management Segmentation » O
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