1 Ó1998 morgan kaufmann publishers chapter 8 i/o systems
DESCRIPTION
3 Ó1998 Morgan Kaufmann Publishers “What’s This Stuff Good For?”TRANSCRIPT
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11998 Morgan Kaufmann Publishers
Chapter 8I/O Systems
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21998 Morgan Kaufmann Publishers
5 Components of Any Computer
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31998 Morgan Kaufmann Publishers
“What’s This Stuff Good For?”
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41998 Morgan Kaufmann Publishers
Motivation for Input/Output
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I/O Design Issues
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Outline
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I/O System Performance
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81998 Morgan Kaufmann Publishers
Simple Producer-Server Model
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91998 Morgan Kaufmann Publishers
Throughput vs. Respond Time
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Throughput Enhancement
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I/O Benchmarks for Perf. Measure (1/2)
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I/O Benchmarks for Perf. Measure (2/2)
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Outline
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I/O Device Examples and Speeds
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151998 Morgan Kaufmann Publishers
Magnetic Disk
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161998 Morgan Kaufmann Publishers
Disk History (1/2)
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171998 Morgan Kaufmann Publishers
Disk History (2/2)
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181998 Morgan Kaufmann Publishers
1-inch Disk Drive!
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Storage Technology Drivers
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Historical Perspective
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Technology Trends
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Disk Device Technology
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Photo of Disk Head, Arm, Actuator
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Magnetic Disk Characteristic
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Typical Numbers of a Magnetic Disk
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261998 Morgan Kaufmann Publishers
Typical Numbers of a Magnetic Disk
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Recent Example: Barracuda 180
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Disk Device Performance
※Assumes average seek distance is random
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Example
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Areal Density
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311998 Morgan Kaufmann Publishers
Data Rate: Inner vs. Outer Tracks
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Disk Performance Model/Trends
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331998 Morgan Kaufmann Publishers
Reliability and Availability
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Disk Arrays
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Disk Summary
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Outline
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371998 Morgan Kaufmann Publishers
What Is a Bus?
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Advantages of Buses
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Disadvantage of Buses
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411998 Morgan Kaufmann Publishers
The General Organization of a Bus
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Master versus Slave
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Buses According to Functionality
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A Computer System with One Bus:Backplane Bus
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A Two-Bus System
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461998 Morgan Kaufmann Publishers
A Three-Bus System
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471998 Morgan Kaufmann Publishers
Main Components of Intel Chipset
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Buses According to Clocking
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Simple Synchronous Protocol
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Simple Synchronous Protocol (Write)
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Asynchronous Handshake (Read)
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521998 Morgan Kaufmann Publishers
Asynchronous Handshake (Write)
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531998 Morgan Kaufmann Publishers
Multiple Potential Bus Masters:Need Arbitration
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Daisy Chain Bus Arbitration
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Centralized Parallel Arbitration
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Increasing the Bus Bandwidth
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Increasing Transaction Rate onMultimaster Bus
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Summary of Bus Options
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Bus Summary
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Outline
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What Need to Make I/O Work?
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Instruction Set Architecture for I/O
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Memory Mapped I/O
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Processor-I/O Speed Mismatch
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Processor Checks Status before Acting
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Polling: Programmed I/O
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Alternative to Polling?
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I/O Interrupt
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Interrupt Driven Data Transfer
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Questions Raised about Interrupts
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Improving Data Transfer Performance
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What is DMA (Direct Memory Access)?
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Delegating I/O from CPU: DMA
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Delegating I/O from CPU: IOP
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Responsibilities of Operating System
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Functions OS Must Provide
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OS: I/O Requirements
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Summary