Main Memory Management

What is the group of many logical addresses called?

What is the purpose of the relocation register?

What is the process of converting logical addresses to physical addresses called?

What is the logical address provided by?

What is the memory management unit also known as?

What is the value added to the logical address to get the physical address?

What is the purpose of the CPU in the context of address translation?

What is the relationship between the logical address space and the physical address space?

What is the primary purpose of main memory management?

What is the main memory of a computer?

Why are binary addresses represented in hexadecimal numbers?

What is the physical address space?

What is the physical address provided by?

What is the limitation of physical addresses?

What happens to programs when they need to be executed?

What is the address space?

Main Memory Management

In multiprogramming, multiple programs are present in main memory, but memory capacity is limited, so memory management is necessary to allocate space for each program.

Main Memory

Main memory is a temporary read/write memory of a computer, composed of continuous locations, each with a specific binary address.
For convenience, addresses are represented in hexadecimal numbers.
Programs are stored in secondary memory and loaded into main memory for execution, and stored in various locations according to space availability.
The group of memory locations is called the address space.

Physical Address Space

A physical address is the address of a location in physical memory (RAM).
Features of physical address space:
- Provided by hardware.
- A binary number made with a combination of 0 and 1.
- Refers to a particular cell or location of primary memory.
- Has some end limits, starting from zero to some end limit.

Logical Address Space

A logical address is the address of a location in virtual memory, also known as a virtual address.
Features of logical address space:
- Provided by the operating system kernel.
- May not be continuous in memory.
- Might be present in the form of segments.
- Sometimes logical addresses might be the same value as a physical address.

Mapping Logical to Physical Address

The memory management unit (MMU) maps logical addresses to physical addresses.
The relocation register is used to convert logical addresses to physical addresses.
Steps:
- CPU generates a logical address.
- The value of the relocation register is added to the logical address.
- The output is the physical address, pointing to a location in main memory.
This process is also known as address translation or address binding.

Learn about the importance of main memory management in multiprogramming, where multiple programs compete for limited memory space. Explore various memory management schemes and their applications.