single.dvi 39 Interlude: Files and Directories Thus far we have seen the development of two key operating system ab- stractions: the process, which is a virtualization of the CPU, and the ad- dress space, which is a virtualization of memory. In tandem, these two abstractions allow a program to run as if it is in […]
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single.dvi 22 Beyond Physical Memory: Policies In a virtual memory manager, life is easy when you have a lot of free memory. A page fault occurs, you find a free page on the free-page list, and assign it to the faulting page. Hey, Operating System, congratula- tions! You did it again. Unfortunately, things get a
single.dvi 38 Redundant Arrays of Inexpensive Disks (RAIDs) When we use a disk, we sometimes wish it to be faster; I/O operations are slow and thus can be the bottleneck for the entire system. When we use a disk, we sometimes wish it to be larger; more and more data is being put online and
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single.dvi 23 Complete Virtual Memory Systems Before we end our study of virtualizing memory, let us take a closer look at how entire virtual memory systems are put together. We’ve seen key elements of such systems, including numerous page-table designs, inter- actions with the TLB (sometimes, even handled by the OS itself), and strategies for
20 Paging: Smaller Tables We now tackle the second problem that paging introduces: page tables are too big and thus consume too much memory. Let’s start out with a linear page table. As you might recall1, linear page tables get pretty big. Assume again a 32-bit address space (232 bytes), with 4KB (212 byte) pages
PowerPoint Presentation Deakin University CRICOS Provider Code: 00113B SIT182 – Real World Practices For Cyber Security Trimester 2 – 2021 Deakin College Week 6 Deakin University CRICOS Provider Code: 00113B Intrusion Detection and Prevention Systems 2 Topics, Deakin University CRICOS Provider Code: 00113B Principles of Intrusion Detection • Characteristics of systems not under attack: 1.
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Week 11 – Update from Unit Coordinator Deakin University CRICOS Provider Code: 00113B SIT182 – Real World Practices For Cyber Security Trimester 2 – 2021 Deakin College Week 10 – Update from Unit Coordinator Deakin University CRICOS Provider Code: 00113B OnTrack: Extension Request 2 • Please do not abuse the support provided in this unit.
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Topic 2 3/5/2021 1 Topic 2 SHELL VARIABLES AND THE BASH ENVIRONMENT Variables Global Variables (aka environment/system variables) – are available in all shells. Can use env or printenv commands to display. The set command will also work, but it will also display environment functions. Most are defined in CAPITAL LETTERS. You can configure aspects
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COMP 228 Review Summer 2021 Chapter 1: Introduction • CPUs use Very Large-Scale Integrated circuits. o Integrated circuits are built with many of transistors. o Transistors replaced vacuum tubes and relays. o Vacuum tubes and relays used electricity to replace mechanical computation devices. o Moore’s Law states the transistor count doubles over time. • Von
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Chapter 8 System Software 2 Chapter 8 Objectives • System Software and their Role – Operating Systems – Programming Tools – Database Software – Transaction Managers. 3 8.1 Introduction • Computers are not useful if they cannot be used to perform work • Users interact with computer via programs • System software, such an operating