1. C021TV-I4-S2

2. ICN : 4. Computers and networks architecture
1. Elementary components of a computer
2. Execution principle of a program
3. Information handover principle
4. Structuring by networks
Introduction de la semaine 2/2
Présentation du sommaire global de la semaine : apparition progressive des éléments de la liste, puis mise en évidence de la portion concernée par la vidéo.
Mise en évidence = police noire + gras
Nom abrégé de cours - Enseignant

3. What can the processor do?
No intelligence!
It follows a cooking recipe
But it needs to be extremely detailed
It can’t guess what’s missing!
The processor witlessly executes one simple instruction after the other

4. If the processor was handling a cooking recipe
Take the recipe book in the cupboard and open it on the right page
Take the ingredients in the fridge or the cupboard
For each line of the recipe
Read and understand the line
Take the useful ingredients
Mix them up, …
Put the mix aside
Or keep it to use it on the next step
Store the book, the cake and the ingredients

5. Data course Processor Disk Program Data input Memory Instruction 01100
Decoding
Data input
Calculation
Result
Instruction
01011
Pas d’intelligence !
Data output
Nom abrégé de cours - Enseignant

6. Some orders of magnitude
Approximately 1 billion operations per second
Operations on huge figures (64bits, …)
Gigabytes of data read and written in the memory every second
Tens of megabytes read and written on the disk every second
But the actual performance is far below that
The processor often has to wait for the hard drive or the memory to have finished writing or reading
And no intelligence!
If the recipe is incomplete or wrong, it is lost
Fréquence en GHz
Un humain peut faire 1 operation par seconde sur des petits nombres
Donc un smartphone calcule plus vite (et sans erreur) que la population mondiale
Nom abrégé de cours - Enseignant

7. Some orders of magnitude
Operating system= Approximately 100 millions instructions
Most of them for managing the various existing peripherals
Office suite = PlusieuSeveral hundreds megabytes
Among which tens of millions instructions
Most of them for the graphical interface, …
Eand lots of data, images, …
Video games = About 20 Go
Most of it for graphics, videos, …

8. What you need to remember
The processor executes programs like a cooking recipe
Witlessly
But very quickly
While handling a huge amount of data