Probability Distributions Probability Distributions Discrete Probability Distributions Continuous Probability Distributions Uniform Normal Chi-Sq Bernoulli Binomial Copyright © 2013 F.. Pearson Bernoulli Distribution Consider only two outcomes: “success” or “failure” Let P denote the probability of success Let 1 – P be the probability of failure Define random variable X: x = […]
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Parallel Programming N-Body Simulation in CUDA Slides based on Martin Burtscher’s tutorial https://userweb.cs.txstate.edu/~burtscher/research/ECL-BH/ Outline • Review: GPU programming • N-body example • Porting and tuning NASA/JPL-Caltech/SSC 2 CUDA Programming Model • Non-graphics programming – Uses GPU as massively parallel co-processor CPU PCI-Express GPU bus • SIMT(single-instruction multiple-threads) model – Thousands of threads neededforfullefficiency • C/C++
Case study: ext2 FS 1 The ext2 file system • Second Extended Filesystem – The main Linux FS before ext3 – Evolved from Minix filesystem (via “Extended Filesystem”) • Features – Block size (1024, 2048, and 4096) configured at FS creation – inode-based FS – Performance optimisations to improve locality (from BSD FFS) • Main
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System Calls Interface and Implementation 1 Learning Outcomes • A high-level understanding of System Call interface • Mostly from the user’s perspective • From textbook (section 1.6) • Understanding of how the application-kernel boundary is crossed with system calls in general • Including an appreciation of the relationship between a case study (OS/161 system call
Welcome to OS @ UNSW COMP3231/9201/3891/9283 (Extended) Operating Systems Dr. Kevin Elphinstone System Software Structure Compiled C Code System Libraries System Calls Operating System Hardware Python Code Python Libraries Python Compiler and Interpreter System Libraries System Calls Operating System Hardware Major OS Topics Processes and Threads Memory and Virtual Memory Management Concurrency and Deadlock Operating
Virtual Memory II 1 Learning Outcomes • An understanding of TLB refill: – in general, – and as implemented on the R3000 • An understanding of demand-paged virtual memory in depth, including: – Locality and working sets – Page replacement algorithms – Thrashing 2 TLB Recap • Fast associative cache of page table entries –
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Virtual Memory 1 Learning Outcomes • An understanding of page-based virtual memory in depth. – Including the R3000’s support for virtual memory. 2 Memory Management Unit (or TLB) The position and function of the MMU 3 Virtual Address 15 14 13 12 11 10 9 8 Page-based VM • PhysicalMemory – Divided into equal-sized frames
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11/05/2020 SampleAnswers2 – COMP3231/COMP9201/COMP3891/COMP9283 Sample Answers for New Sample Exam Q1 1. False, the role of the operating system is to abstract away low level details 2. True (If the processor features a privileged mode, then the operation system will use it.) 3. False, the kernel has a separate stack 4. False, the operating system
File Management Tanenbaum, Chapter 4 COMP3231 Operating Systems Kevin Elphinstone 1 Outline • Files and directories from the programmer (and user) perspective • Files and directories internals – the operating system perspective 2 A brief history of file systems Early batch processing systems –No OS –I/O from/to punch cards –Tapes and drums for external storage,
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Concurrency and Synchronisation 1 Learning Outcomes • Understand concurrency is an issue in operating systems and multithreaded applications • Know the concept of a critical region. • Understand how mutual exclusion of critical regions can be used to solve concurrency issues • Including how mutual exclusion can be implemented correctly and efficiently. • Be able
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