Technology themes over time
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Technology Themes Over Time. CPIS 210 ch01. Moore’s Law. Original: The amount of memory available on a chip (which tends to be constant cost) doubles about every 18 months Now: We tend to assume this applies to every performance-related number in IT

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Technology Themes Over Time

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Technology themes over time

Technology Themes Over Time

CPIS 210 ch01


Moore s law

Moore’s Law

  • Original: The amount of memory available on a chip (which tends to be constant cost) doubles about every 18 months

  • Now: We tend to assume this applies to every performance-related number in IT

  • Reality: Some numbers are very hard to increase

    • So we find another way to do that function that is inherently faster


Serial vs parallel

Serial vs Parallel

  • Early belief: Parallel is inherently faster than serial

  • Current practice: Go serial, but go fast

  • Progression:

    • Parallel to maximize low-speed lines

    • Faster serial line

    • Fiber

  • See this in networking, disc drives, video


How purposes change

How Purposes Change

  • Highest-priority purposes dominate when costs are high

    • 1940s: Ballistics table for new weapon

  • New uses appear when costs moderate

    • 1960s: Payroll

  • Radical re-purposing as costs become trivial

    • Blinking lights sold at Dollar Tree


Standardization

Standardization

  • Old approach: Everything is part of “our” product line

  • Medium approach: “Our” product is core, but to do x you’ll need this additional device from another vendor:

  • Emerging approach: Multi-vendor environment ruled by standards

    • What about your entity directory?

  • Issue: Do you have multiple vendors within a given box?

  • Issue: “We go beyond the standard to get better [performance][features].”


Energy

Energy

  • Mainframe supplied by carefully-conditioned power w/backup

  • Distributed system – using local UPSs as needed

  • Extremely low-power devices: batteries, solar

  • What happens to your data when power fails?

  • How does the system function when power is out

  • How do you return to normal operation after power is restored?


Configuration methods

Configuration Methods

  • Manual / hardware

    • Jumpers and switches

  • Manual / software

    • Early: Connect VT100 terminal

    • Current: Device contains a mini Web server

  • Automatic (self-discovery)

    • Easier to set up in most cases

    • If using a program, must run on workstation

    • Problems resulting from design errors or glitches can to be very difficult to solve

      • Nice to have a manual config option


Configuration memory

Configuration Memory

  • CMOS

  • FLASH

  • Hard drive

  • Backup/Restore?

  • A major issue for CSAs: Where is the data physically kept?


Why use it

Why Use IT?

Business Models

  • Computers give us more efficiency

    • Calculating FICA in payroll

    • Controlling inventory at big-box stores

  • Computers allow us to be more flexible

    • Handling new compensation formulae for sales people

  • Computers enable new business models

    • RedBox


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