Operating Systems - To Parent Directory - James Madison University

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Multiprogramming: SEVERAL JOBS MEMORY-RESIDENT Tanenbaum (2008). Modern Operating Systems. 3 rd Edition. Figure 1-5. © 2008 Pearson Education 02-Sep-2008 © 2008 Charles Abzug 19 Brief History of Control of Computers (OS) 6. Evolution from Mainframe/Minicomputer → Personal Computer (PC): CPU utilization no longer the critical issue 7. Evolution from Standalone PCs → Networked PCs: Re-Emergence of issues from large multi-user system environment: Protection of data Isolation of users from each other Protection from malicious users 8. Importance of Graphical User Interface (GUI): Apple/MacIntosh family: MacOS (GUI over Mach/Free BSD kernel) WIntel family: MS-DOS & IBM-DOS evolving to OS/2 and “Windows” 02-Sep-2008 © 2008 Charles Abzug 20 10
Brief History of Control of Computers (OS) 9. Multiprocessors: tightly-controlled systems Certain critical resources usually shared: System Clock System Bus Main Memory Peripheral Devices Power Supply 02-Sep-2008 © 2008 Charles Abzug 21 Brief History of Control of Computers (OS) 9. Multiprocessors: tightly-controlled systems Certain critical resources usually shared: System Clock System Bus Main Memory Peripheral Devices Power Supply Advantages: Economies of scale achieved through sharing Increased Reliability: Fault Tolerance OR High Availability Increased Throughput: ALWAYS less than proportional to number of processors because of: (i) Overhead (ii) Contention for Resources Two Principal Forms of Multiprocessor Systems: (i) Symmetric Multiprocessing (SMP): All processors run OS, and intercommunicate as necessary. (ii) Asymmetric Multiprocessing: One master processor runs OS; remainder are slaves. NOTE: Asymmetric is simpler; Symmetric is more efficient, more robust. 02-Sep-2008 © 2008 Charles Abzug 22 11
Page 1 and 2: Operating Systems: INTRODUCTION Cha
Page 3 and 4: Sharing of Resources 1. Multiplexin
Page 5 and 6: Computer Environment: Principal Det
Page 7 and 8: Computer Environment: The Principal
Page 9: An Early Batch System Tanenbaum (20
Page 13 and 14: Brief History of Control of Compute
Page 15 and 16: Multiprogramming • Technique for
Page 17 and 18: Process Control & Real-Time • Com
Page 19 and 20: Software Layers and their Relations
Page 21 and 22: Review of Hardware Concepts Tanenba
Page 23 and 24: Magnetic Disk Unit Tanenbaum (2008)
Page 25 and 26: Possibility of Deadlock vs. Actual
Page 27 and 28: Development of Hardware Features to
Page 29 and 30: Some POSIX System Calls Tanenbaum (
Page 31 and 32: A Hard Link to a UNIX File Tanenbau
Page 33 and 34: The "THE" Operating System Tanenbau
Page 35: Metric Prefixes Tanenbaum (2008). M

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