'Priority inversion' diaporamas de présentation

Operating Systems Real-Time Operating Systems

Operating Systems Real-Time Operating Systems . Chalermek Intanagonwiwat. Slides courtesy of Subhashis Banerjee. Real-Time Systems. Result in severe consequences if logical and timing correctness are not met Two types exist Soft real-time Tasks are performed as fast as possible

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Mars pathfinder failure

Mars pathfinder failure. Documentation. Speech Dave Wilner recorded by Mike Jones Comments by Glenn Reeves, Mars Pathfinder Flight Software Cognizant Engineer Hereafter called JPL (Jet Propulsion Lab) Talk by Ian A. Mason, University of New England, Australia

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3.2 Rate Monotonic Analysis

3.2 Rate Monotonic Analysis. Assumptions A1. No nonpreemptible parts in a task, and negligible preemption cost A2. Resource constraint on CPU time only A3. No precedence constraints among tasks A4. All tasks periodic A5. Relative deadline = period. Rate-Monotonic Scheduling(RMS). Overview

1.28k views • 51 slides

Is Java Ready For Real-Time Embedded Systems?

Is Java Ready For Real-Time Embedded Systems?. David Sharp, Jim Urnes, Jr. david.sharp@boeing.com, james.m.urnes-jr @boeing.com Boeing St. Louis USA. Angelo Corsaro corsaro@cs.wustl.edu DOC Group Washington University St. Louis, USA. Table of Contents. Real Time Java

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Scheduling Theory

Scheduling Theory. ITV Real-Time Systems Anders P. Ravn Aalborg University March 2007. Characteristics of a RTS. Timing Constraints Dependability Requirements Concurrent control of separate components Facilities to interact with special purpose hardware. Real-Time Facilities. Topics

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Operating Systems, 112

Operating Systems, 112. Practical Session 5, Synchronization. 1. Motivation. Multiprocessing needs some tools for managing shared resources Printers Files Data Bases. 2. Conditions for a good Solution.

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Outline

Outline. Processes Threads Inter-process communication (IPC) Classical IPC problems Scheduling. Issues about IPC. Communication between processes is indispensable. Interrupt is not preferred. Why? How about pipe ? Basic issues How to pass information

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Rate Monotonic Analysis

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CSE403 Software Engineering Autumn 2000 Fixing the Bugs

CSE403 Software Engineering Autumn 2000 Fixing the Bugs. Gary Kimura Lecture #13 October 29, 2001. Today. Finish with finding the bugs How do we fix bugs? Prioritize bugs Tracking bugs and their fixes. Programming is simple, getting it to work is hard.

429 views • 20 slides

Transactional Memory Overview

Transactional Memory Overview. Olatunji Ruwase 15-740 Fall 2007 Oct 4 2007. Future PCs are Multicore. Parallel s/w for performance. Locks Deadlocks Priority Inversion Buggy Convoy Effect Limited concurrency. Transactions. Borrowed from Databases

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Lock Basics

Lock Basics. Jaehyuk Huh Computer Science, KAIST. Consistency Model. Lock in Shared Memory. Spin locks : processor continuously tries to acquire, spinning around a loop trying to get the lock Lock acquire

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Real-time Design and Verification

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Resource management and Synchronization

Resource management and Synchronization. Akos Ledeczi EECE 354, Fall 2010 Vanderbilt University. Resource Sharing. Disable/Enable interrupts: only where critical region is very quick. Should be used sparingly in RT systems. Lock/Unlock scheduler: for quick critical sections still.

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COT 4600 Operating Systems Fall 2009

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Resource and Resource Access Control

Resource and Resource Access Control. Fred Kuhns Applied Research Laboratory Computer Science and Engineering Washington University in St. Louis. Blocking Time. Higher priority job is blocked by a lower priority job during a nonpreemptive interval: priority inversion . Nonpreemptivity:

650 views • 14 slides

Real Time Systems

Real Time Systems. RTOS. Some terms. Program Process Thread Tasks. What are Real Time Systems. An RTS is a (computing) system where correctness of computing depends not only on the correctness of the logical result of the computation, but also on the result delivery time

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CGS 3763 Operating Systems Concepts Spring 2013

CGS 3763 Operating Systems Concepts Spring 2013. Dan C. Marinescu Office: HEC 304 Office hours: M- Wd 11:30 - 12:30 A M. Last time: CPU Scheduling Process synchronization Today Process synchronization Transactions Locks Deadlocks Semaphores Monitors

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Real Time Operating Systems

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CGS 3763 Operating Systems Concepts Spring 2013

CGS 3763 Operating Systems Concepts Spring 2013. Dan C. Marinescu Office: HEC 304 Office hours: M- Wd 11:30 - 12:30 A M. Last time: CPU Scheduling Today: CPU scheduling Next time CPU scheduling Process synchronization Reading assignments

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Midterm Review

Midterm Review. CSE321 B.Ramamurthy. Exam Date. October 22, 2009 Please bring Pencils, pens and erasers. This is a closed book exam. However you are allowed one sheet of any information you like. No calculators allowed. Topics. Real-time system: definitions

149 views • 5 slides