Paging Operating Systems Lab Class 8 In this lab session we will build a virtual memory system in software based on paging. We will see how address translation and a translation look-aside buffer (TLB) work. The following figure is to recall the translation process in paging with TLB. 1 Getting Started 1. Download the os-lab8.zip […]
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1 Paging Paging.java Paging Operating Systems Lab Class 8 – Model Solutions 1 PageTable.java TLB.java 5. The hit rate represents the percentage of time that the page number of interest is found in the TLB. An 80-percent hit rate, for example, means that we find the desired page number in the TLB 80 percent of
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Operating Systems Lecture 4b Dr Ronald Grau School of Engineering and Informatics Spring term 2020 Previously 1 Scheduling Scheduling policies & performance Multi-level queue scheduling Feedback scheduling Real-time scheduling Java thread scheduling Today 2 Evaluating Scheduling Algorithms Deterministic Evaluation Probabilistic Evaluation Stochastic Evaluation Simulation Implementation
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Operating Systems Lecture 4b Dr Ronald Grau School of Engineering and Informatics Spring term 2020 Previously 1 Scheduling Scheduling policies & performance Multi-level queue scheduling Feedback scheduling Real-time scheduling Java thread scheduling Today 2 Evaluating Scheduling Algorithms Deterministic Evaluation Probabilistic Evaluation Stochastic Evaluation Simulation Implementation
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Operating Systems Lecture 4a Dr Ronald Grau School of Engineering and Informatics Spring term 2020 Previously 1 Scheduling Time scales: Long-, medium-, and short-term scheduling Scheduling criteria Scheduling algorithms: FCFS, SJF, SRT, RR Today 2 Scheduling Performance overview of last week’s scheduling policies: FCFS, SJF, SRT, RR Another look at
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Java Threads Operating Systems Lab Class 3 – Model Solutions 1 Exercise (a): Primes Primes.java 1 PrimesTask.java Reflections: 1. No. 2. If the program has to react to user inputs. In this case the computation can be done in the background. 2 Exercise (b): Letters Letters.java LettersTask.java Reflections: 1. Data parallelism. 2. Ask the lab
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Operating Systems Lecture 4a Dr Ronald Grau School of Engineering and Informatics Spring term 2020 Previously 1 Scheduling Time scales: Long-, medium-, and short-term scheduling Scheduling criteria Scheduling algorithms: FCFS, SJF, SRT, RR Today 2 Scheduling Performance overview of last week’s scheduling policies: FCFS, SJF, SRT, RR Another look at
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1 Part (a) Resources Resources.java Thread Synchronisation/Semaphores Operating Systems Lab Class 6 – Model Solutions 1 GetTask.java ReleaseTask.java ResourceManager.java 7. Extra question: The code that decrements available resources and the code that incre- ments available resources are the statements that could be involved in race condition. In part (a), we use Java monitors synchronized, wait
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1 Tunnel Tunnel.java Deadlocks Operating Systems Lab Class 7 – Model Solutions 1 NorthBound.java SouthBound.java TimesGenerator.java TunnelManager.java 7. Extra question: A mutex semaphore is all that is needed to solve this problem. When a train approaches the tunnel it will reserve (request) the semaphore. If granted, it will pass the tunnel, once it has passed
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Operating Systems Lecture 5a Dr Ronald Grau School of Engineering and Informatics Spring term 2020 Previously 1 Evaluation of scheduling algorithms Deterministic evaluation Probabilistic evaluation Queueing models Little’s Law Stochastic evaluation Simulation models Today 2 Process Synchronisation Inter-Process Communication Race conditions Communication models Critical section