'Deadlock detection' diaporamas de présentation

Deadlocks

Deadlocks. Deadlocks. Deadlocks : Occurs when threads are waiting for resources with circular dependencies Often involve nonpreemptable resources , which cannot be taken away from its current thread without failing the computation (e.g., storage allocated to a file). Deadlocks.

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OPERATING SYSTEM

OPERATING SYSTEM. LESSON 8 (DEADLOCKS). DEADLOCKS.

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Operating Systems, 122

Operating Systems, 122. Practical Session 8 Deadlocks. Deadlocks. The ultimate form of starvation. A set of processes is deadlocked if each process in the set is waiting for an event that only another process in the set can cause. Conditions for Deadlock.

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Chapter 6 Concurrency: Deadlock and Starvation

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Operating Systems, 112

Operating Systems, 112. Practical Session 8 Deadlocks. Deadlocks. The ultimate form of starvation. A set of processes is deadlocked if each process in the set is waiting for an event that only another process in the set can cause. Conditions for Deadlock.

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Operating Systems, 122

Operating Systems, 122. Practical Session 8 Deadlocks. Deadlocks. The ultimate form of starvation. A set of processes is deadlocked if each process in the set is waiting for an event that only another process in the set can cause. Conditions for Deadlock.

516 views • 42 slides

Concurrency : Deadlock and Starvation

Concurrency : Deadlock and Starvation. Principles of deadlock Deadlock is the permanent blocking of a set of processes that either compete for system resources or communicate with each other. Types of resources Reusable

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Module 8: Deadlocks 10/22/03+

Module 8: Deadlocks 10/22/03+. System Model Deadlock Characterization Methods for Handling Deadlocks Deadlock Prevention Deadlock Avoidance Deadlock Detection Recovery from Deadlock Combined Approach to Deadlock Handling NOTE: Instructor annotations in BLUE. The Deadlock Problem.

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Deadlocks

Deadlocks. 3.1. Resource 3.2. Introduction to deadlocks 3.3. The ostrich algorithm 3.4. Deadlock detection and recovery 3.5. Deadlock avoidance 3.6. Deadlock prevention 3.7. Other issues . Chapter 3. Resources.

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Distributed Database Systems

Distributed Database Systems. R* Optimizer Validation and Performance Evaluation for Local Queries Lothar F. Mackert, Guy M. Lohman R* Optimizer Validation and Performance Evaluation for Distributed Queries Lothar F. Mackert, Guy M. Lohman R*: An Overview of the Architecture

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Deadlock Detection in Linux

Technion , Electrical engineering department NSSL Laboratory. Deadlock Detection in Linux . By: Gal Nave and Dan Slov Supervisor: Dmitri Perelman. Overview Introduction Deadlock detection algorithm Algorithm implementation in Linux Summary. Introduction

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6.852: Distributed Algorithms Spring, 2008

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Unit 9 Concurrency Control

Unit 9 Concurrency Control. Content . 9.1 Introduction 9.2 Locking Technique 9.3 Optimistic Concurrency Control. 9.1 Introduction. T 1 T 2. 100. 100. buffer. buffer. Database 100. Concurrency Control: Introduction. The Problem

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Concurrency Control and Recovery

Concurrency Control and Recovery. In real life: users access the database concurrently, and systems crash. Concurrent access to the database also improves performance, yields better utilization of resources. BUT: if not careful, concurrent access can lead to incorrect database

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Alternative Concurrency Control Methods

Alternative Concurrency Control Methods. R&G - Chapter 17. Roadmap. So far: Correctness criterion: serializability Lock-based CC to enforce serializability Strict 2PL Deadlocks Locking granularities Tree locking protocols Phantoms Today: Alternative CC mechanisms.

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LIRA: Linux Inter-process Race Analyzer

LIRA: Linux Inter-process Race Analyzer. Tipp Moseley Intel Corporation University of Colorado. Introduction. Motivation for Software Quality Related work Why Lira? Race & Deadlock Detection Algorithms Design Pitfalls Results. Motivation for Software Quality.

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Deadlock

Deadlock . B.Ramamurthy. CSE421. Introduction. Parallel operation among many devices driven by concurrent processes contribute significantly to high performance. But concurrency also results in contention for resources and possibility of deadlock among the vying processes.

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Ali Kheradmand , Baris Kasikci , George Candea

Lockout: Efficient Testing for Deadlock Bugs . Ali Kheradmand , Baris Kasikci , George Candea. Deadlock. Set of threads Each holding a lock needed by another thread Waiting for another lock to be released by some other thread. Why Do Deadlocks Matter?. Common in modern software

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Deadlocks

Deadlocks. pp. 309. System Model. A process may utilize a resource in only the following sequence:. Request Use Release. Necessary Conditions. ???????????????? ????? necessary condition ??? ???????? ?????????? ????????. Mutual exclusion (non-sharable)

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Review Question

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