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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Operating Systems Principles and Practice Anderson and Dahlin v. 0.22 Operating Systems: Principles and Practice Version 0.22 Base revision e8814fe, Fri Jan 13 14:51:02 2012 -0600. Copyright ⃝c 2011-2012 by Thomas Anderson and Michael Dahlin, all rights reserved. Contents Preface v 1 Introduction 1 1.1 What is an operating system? 4 1.2 Evaluation Criteria 20
CE204 Data Structures and Algorithms Part 5 18/02/2019 CE204 Part 5 1 Divide and Conquer The principle of divide and conquer states that a large problem should be broken down into two or more smaller problems to be solved separately before combining their solutions. The smaller problems could be distinct or could just be smaller
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CE204 Data Structures and Algorithms Part 7 18/02/2020 CE204 Part 7 1 Graphs 1 A graph is a collection of vertices and edges, where each edge connects two of the vertices. We shall assume that the two vertices must be distinct (i.e. an edge cannot connect a vertex to itself) and that there is at
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