ECE 391 Exam 1, Fall 2010 Tuesday 28 September Name: • Be sure that your exam booklet has 11 pages. • Write your name at the top of each page. • This is a closed book exam. • You are allowed one 8.5× 11″ sheet of notes. • Absolutely no interaction between students is allowed. […]
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1 University of Waterloo Cheriton School of Computer Science CS 251: Sections 1, 2, and 3 Computer Organization and Design Slides for Fall 2021 These slides are for the use of students taking CS 251 in Fall 2021. You should not share these files with anyone else, and you agree to delete all your copies
19 Paging: Faster Translations (TLBs) Using paging as the core mechanism to support virtual memory can lead to high performance overheads. By chopping the address space into small, fixed-sized units (i.e., pages), paging requires a large amount of mapping information. Because that mapping information is generally stored in physical memory, paging logically requires an extra
single.dvi 36 I/O Devices Before delving into the main content of this part of the book (on persis- tence), we first introduce the concept of an input/output (I/O) device and show how the operating system might interact with such an entity. I/O is quite critical to computer systems, of course; imagine a program without any
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single.dvi 28 Locks From the introduction to concurrency, we saw one of the fundamental problems in concurrent programming: we would like to execute a series of instructions atomically, but due to the presence of interrupts on a single processor (or multiple threads executing on multiple processors concur- rently), we couldn’t. In this chapter, we thus
COPE-07 Operating Systems.indd 7 Operating Systems Uwe R. Zimmer – The Australian National University Computer Organisation & Program Execution 2021 Operating Systems © 2021 Uwe R. Zimmer, The Australian National University page 389 of 489 (chapter 7: “Operating Systems” up to page 436) References for this chapter [Patterson17] David A. Patterson & John L. Hennessy
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single.dvi 29 Lock-based Concurrent Data Structures Before moving beyond locks, we’ll first describe how to use locks in some common data structures. Adding locks to a data structure to make it us- able by threads makes the structure thread safe. Of course, exactly how such locks are added determines both the correctness and performance of
single.dvi 15 Mechanism: Address Translation In developing the virtualization of the CPU, we focused on a general mechanism known as limited direct execution (or LDE). The idea be- hind LDE is simple: for the most part, let the program run directly on the hardware; however, at certain key points in time (such as when a
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single.dvi B Virtual Machine Monitors B.1 Introduction Years ago, IBM sold expensive mainframes to large organizations, and a problem arose: what if the organization wanted to run different oper- ating systems on the machine at the same time? Some applications had been developed on one OS, and some on others, and thus the problem. As
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single.dvi 26 Concurrency: An Introduction Thus far, we have seen the development of the basic abstractions that the OS performs. We have seen how to take a single physical CPU and turn it into multiple virtual CPUs, thus enabling the illusion of multiple pro- grams running at the same time. We have also seen how