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 30 Condition Variables Thus far we have developed the notion of a lock and seen how one can be properly built with the right combination of hardware and OS support. Unfortunately, locks are not the only primitives that are needed to build concurrent programs. In particular, there are many cases where a thread wishes
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single.dvi 4 The Abstraction: The Process In this chapter, we discuss one of the most fundamental abstractions that the OS provides to users: the process. The definition of a process, infor- mally, is quite simple: it is a running program [V+65,BH70]. The program itself is a lifeless thing: it just sits there on the disk,
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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
single.dvi 6 Mechanism: Limited Direct Execution In order to virtualize the CPU, the operating system needs to somehow share the physical CPU among many jobs running seemingly at the same time. The basic idea is simple: run one process for a little while, then run another one, and so forth. By time sharing the CPU
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33 Event-based Concurrency (Advanced) Thus far, we’ve written about concurrency as if the only way to build concurrent applications is to use threads. Like many things in life, this is not completely true. Specifically, a different style of concurrent pro- gramming is often used in both GUI-based applications [O96] as well as some types of
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Overview Locks and mutexes Working with multiple locks Summary and next lecture XJCO3221 Parallel Computation University of Leeds Copyright By PowCoder代写 加微信 powcoder Lecture 7: Lock and mutexes XJCO3221 Parallel Computation Locks and mutexes Previous lecture Working with multiple locks Today¡¯s lecture Summary and next lecture Previous lecture In the last lecture we saw how
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Lecture 11 CS 111: Operating System Principles Page Replacement 1.0.1 Jon Eyolfson April 22, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ Background: As You Go Down Capacity Increases, but Speed Decreases 1 We Want to Hide the Hierarchy from the User Each level wants to pretend it
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Virtual Machines Lecture 21 CS 111: Operating System Principles Virtual Machines 1.0.0 Jon Eyolfson May 27, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ Virtual Machines Abstract an Entire Machine Goal: run multiple operating systems on a single machine Each OS believes they’re the only one running We
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