本文主要是介绍UCB CS162 Stanford CS144 Information Theory(Math monk)，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
文章目录
- 1 Introduction
- 2 History and Structure of OS
- 3 Concurrency: processes, threads, and address spaces
- 4 thread dispatching(派遣)
- 1 IP service model
- 2 TCP service model
1 Introduction
http://inst.eecs.berkeley.edu/~cs162
Software emulation of an abstract machines
programming simplicity:
each process thinks it has all memory/CPU time
each porcess thinks it owns all devices
didferent devices appear to have same interface
OS:
- memory management
- I/O management
- CPU scheduling
- communication
- multitasking/multiprogramming
2 History and Structure of OS
- ENIAC: 1945-1955
- histroy phase 1:1948-1970
lack of interaction between user and computer
batch program: feed computer batches and make users wait
no protection - history phase 1.5: multiprogramming、 DMA、interrupt
- histroy phase 2:
multiple users interact with the systems at the same time
sacifice CPU time to get better response time
users do debugging, editing, and email online - history phase 3: 1981-
personal computing
PC become powerful and OS become complexity
GUI: graphical user interfaces - history phase 4: 1988-
distributed systems
networking: internet
LAN: local area network
NAP: network access point - history phase 5: 1995- mobile systems
ubiquitous mobile devices
wireless/wide area networking
layered structure
hardward->kernel layer->user layer
standard component and service:
process control, main memory, I/O, file system, UI
3 Concurrency: processes, threads, and address spaces
thread is the concurrent piece that’s executing an instruction stream that we can have multiple of them inside a process
4 thread dispatching(派遣)
process: OS abstraction to represent what is needed to ruan a single, multithreaded program.
CS144: Introduction to Computer Networking
1 IP service model
- IP service
IPv4: 32bit addresses
IPv6: 128bit addresses
2 TCP service model
syn->syn+ack->ack
- alternating-bit protocol每次只发一个带序号的
- windowing protocol每次发很多带序号的
- TCP: transmission control protocol
use window-based acknowledgement protocol
automatically retransmits lost packets
adjusts rate of transmission to avoid congestion
这篇关于UCB CS162 Stanford CS144 Information Theory(Math monk)的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
