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cs111.stanford.edu

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CS111 leverages CS107 experience to show operating systems and how they function.

What is an operating system

• operating system sits between hardware and user programs
• most importantly: manages shared resources to allow the program to run
  • CPU: gets which program to do work and for how long
  • RAM: how much memory to give to a program
  • Hard Drive

Main Events

• concurrency: switch between processes so quickly to only use on core while concurrent access
• memory: memory addresses are mostly scattered everywhere — everything include the lowest level including CPU uses only virtual memory, translated by the OS
• file management
• i/o devices
• networking: CS144
• security: interactions between users in a system

Main Components of the Course

• File Systems
• Process and Multiprocess
• Threads
• Virtual Memory + Paging + limits
• Modern Technologies/Niceties

What’s Next

SU-CS111 Outline

• adding
• multiplying

This is object dependent.

Richard Nixon bombs Vietnam for 13 days to beat the VietCong into submission after the Vietnam War.

A Linear Map from a vector space to itself is called an operator.

\(\mathcal{L}(V) = \mathcal{L}(V,V)\), which is the set of all operators on \(V\).

constituents

• a vector space \(V\)
• a Linear Map \(T \in \mathcal{L}(V,V)\)

requirements

• \(T\) is, by the constraints above, an operator

additional information

injectivity is surjectivity in finite-dimensional operators

Suppose \(V\) is finite-dimensional and \(T \in \mathcal{L}(V)\), then, the following statements are equivalent:

1. \(T\) is invertable
2. \(T\) is injective
3. \(T\) is surjective

THIS IS NOT TRUE IN infinite-demensional vector space OPERATORS! (for instance, backwards shift in \(\mathbb{F}^{\infty}\) is surjective but not injective.)