System Architecture - The performance of the CPU Flashcards Preview

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Flashcards in System Architecture - The performance of the CPU Deck (28):
1

What is the function of the CPU?

  • To fetch, decode and execute instructions
  • To process data

2

What affects the performance of a computer?

  • Cache Size
  • Number of Cores
  • Clock Speed
  • RAM

3

What is the part of a processor in which instructions are executed is known as?

The core

4

How many cores does a dual-core processor contain?

2

5

How many cores does a quad-core processor contain?

4

6

Do cores execute instructions together or separately?

separately

7

What are the benefits of a dual-core processor over a single core processor?

  • Tasks can split between the processors…
  • which leads to more processes being completed per second…
  • this speeds up the computer

8

If the number of cores goes up from 2 to 4 – what is the exact effect on performance?

The maximum number of instructions executed per second doubles

9

What are the effects of using a processor with more cores?

  • More instructions carried out simultaneously
  • The processor can process more instructions at the same time, which allows batches of instructions to be executed more quickly, which allows for more programs to be run at the same time.

10

What acts as an intermediary between the processor and the Main Memory

Cache

11

What is cache?

Very fast, and usually a very small amount of memory on the processor chip

12

What is held in cache?

Commonly used instructions and data

13

How does the cache size affect the performance of the CPU?

  • data is transferred faster (1)…
  • …which makes a CPU more efficient (1)

 

  • It is faster to transfer to and from cache (1)…
  • …than transferring to and from RAM (1).

14

What is the purpose of cache memory?

  • To store instructions / data that is frequently used
  • Stores previously used / next to be used instructions and data
  • Provides faster access to data and instructions than the RAM
  • Speeds up access because instructions & data can be loaded to the CPU more quickly

15

What are the effects of using a processor with a bigger cache?

  • More space available for frequently used instructions / data…
  • this will reduce the number of disk transfers (fetching data from RAM)...
  • which leads to faster fetching of data and instructions…
  • which leads to faster processing

16

What is a processors clock speed?

The number of instructions a processor can carry out in a second

17

Hertz

What is a processors’ clock speed measured in?

18

A 1GHz processor can execute how many instructions?

1 Billion Instructions per second

19

A 2GHz processor can execute how many instructions?

2 Billion Instructions Per Second

20

If the processing speed goes up from 2GHZ to 4GHZ – what is the exact effect on the performance of the computer?

The maximum number of instructions executed per second doubles

21

If the processing speed goes up from 1GHZ to 4GHZ – what is the exact effect on the performance of the computer?

The maximum number of instructions executed per second quadruples

22

What does RAM stand for?

Random Access Memory

23

What is RAMs function?

  • The computer’s main memory
  • Stores data, applications and the operating system while in use

24

Is RAM Volatile or Non-volatile

Volatile - all the data is lost when the power is switched off

25

How would increasing the amount of RAM  improve a computer's performance?

  • More instructions / programs / applications can run at the same time / be held in RAM
  • Open software faster / respond faster
  • More memory space for current programs
  • Run more memory intensive programs / relevant example e.g. computer games / graphic rendering
  • reduces use of Virtual Memory
  • …..less use of hard drive which is slower to access

26

How could a installing a graphics card improve the performance of a computer

  • It could carry out processes for the CPU
  • It can improve the speed and quality of graphics

27

How could changing a computer's hard disk drive (HDD) for a Solid State Drive (SSD)?

Faster read / write speed

28

If the processing speed goes up from 2GHZ to 4GHZ and the number of cores goes from 2 to 4 – what is the exact effect on the performance of the computer?

The maximum number of instructions executed per second quadruples