Gain a thorough understanding of memory concepts with these detailed lecture notes from COMP15212. Explore different types of memory, caching mechanisms, and memory management techniques, essential for anyone looking to excel in computer architecture and system performance.
Of 6C
hexadecimal Dynamic
space
07 6C
Local Dynamici
Heap (possibly Stack variables
6 Read/write
08 F
fragmented)
09 00
Dynamic
* Heap Run time structures
!
&
OA
Read/write
A5
Global Data Read/write
- -
Read
Constants
only
.. --
Reserved by computer
-- ...
8-bitWestata
FE DE
Code Read only
↑ &
↓
281 D
FF AD
OS
.
Restricted !
.
private
space
Processes Memory Management Sizes
Processes use an idealised set of virtual addresses
Processor architecture determines the size (#of locations) of the virtual
address space
OS Momony
These then mapped to
are
physical addresses
Management
Process * locations
Processes don't have to worry about where they are
**
Usually are 8-bit (bytes)
Software
in memory
MMU
Storage ,
0 1 1 101 O 1
Cache,
Memory RAM
Management
Unit
16-bit > 65356 addresses
System
D · Process 8 * Process 8 Process
a
896000 # base + limit Process 7
??? A
256000 Process 2
Process 2 Process 2 Process 2 Process 2
base
Process 2 64000 &
O Process 2
Virtual addresses Strategies
38400
First-fit :
Stop when you
find a hole big
Process 3
enough
base and limit registers 128000
base "Start" of physical Best-fit : Find the smallest hole big
:
O
enough
memory
limit : Size of range Worstfit Find : the largest hole
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