CE204 Data Structures and Algorithms Part 4 09/02/2019 CC204 Part 4 1 Analysing Running Times 1 If there are several possible algorithms for solving a problem we may wish to determine which is the most efficient. One way to do this would be to implement all of the algorithms and perform experiments. This may, however, […]
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CE204 Data Structures and Algorithms Part 1 16/01/2019 CE204 Part 1 1 Recommended Reading The most useful book for much of the material in this module is Data Structures and Algorithm Analysis in Java (2nd ed.), M.A. Weiss (Pearson, 2007) This book does not, however, cover in detail all of the Java programming material. Hence
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CE204 Data Structures and Algorithms Part 8 08/03/2020 CE204 Part 8 1 Balancing Binary Search Trees 1 We saw in part 4 that the average times for binary search tree operations are O(log n), but in the worst case the times are O(n). To obtain optimum performance we would like to ensure that binary search
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ECS150 FQ20 March 27, 2020 Lecture Notes 5 Synchronizing Access to Shared Objects • Independent Threads – Threads that operate in completely independent locations in memory • Cooperating Threads – Threads that read/write shared state • Multi-threaded program execution • Program execution depends on the possible interleavings of threads’ access to shared state • Program
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ECS150 FQ20 March 27, 2020 Lecture Notes 4 Concurrency and Threads • Concurrency – Multiple activities that can happen at same time (all continue to make progress over time) • Parallelism – Multiple activities happen simultaneously Thread Use Cases • • Single Threaded – Single sequential execution context Multithreaded – Multiple concurrent execution contexts Text
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ECS150 FQ20 March 27, 2020 Lecture Notes 6 Multi-Object Synchronization • Multiprocessor Performance – Locks can become performance bottleneck for shared objects • Correctness – Interactions of multiple shared objects must also be correct • Deadlock – Threads are permanently stuck waiting Multiprocessor Lock Performance • Request Parallelism – Requests are handled by multiple threads
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ECS150 FQ20 March 27, 2020 Scheduling Lecture Notes 7 • Processor Scheduling Policy – Policy that determines which thread runs first • Task – A user request, often called a job • Response time (or delay) – The user-perceived time to do some task • Predictability – Low variance in response time to do some
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CE204 Data Structures and Algorithms Part 9 08/03/2020 CE204 Part 9 1 Computability 1 Theoretical computer scientists have for many years been interested in the subject of computability, addressing the question of exactly what can be done by a computer. Informally a function can be said to be computable if we can write an algorithm
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ECS150 FQ20 March 27, 2020 Lecture Notes 1 What Is An Operating System? • Operating System Roles • Referee – Decides upon management of resources • Illusionist – Provides an abstraction from physical • Glue – Provides common set of services/features that facilitate sharing • Resource Sharing – OS as Referee • Resource Allocation –
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Chapter 8: Single-Area OSPF Scaling Networks Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 1 Chapter 8 – Sections & Objectives § 8.1 OSPF Characteristics • Explain how single-area OSPF operates. § 8.2 Single-Area OSPFv2 • Implement single-area OSPFv2. § 8.3 Single-Area OSPFv3 • Implement single-area OSPFv3. Presentation_ID © 2008 Cisco Systems,
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