#Memory-Allocation

Memory Management Techniques

Logical versus Physical Address Space

• Logical Address
  • An address generated by the CPU while a program is running
  • The logical address is basically the address of an instruction or data used by a process.
  • User can access logical address of the process.
  • User has indirect access to the physical address through logical address
  • Logical address does not exist physically. Hence, aka, Virtual address
  • The set of all logical addresses that are generated by any program is referred to as Logical Address Space
  • Range: 0 to max

Non-contiguous Allocation

• The non-contiguous memory allocation also reduces memory wastage caused by internal and external fragmentation.
• Paging and Segmentation are the two ways that allow a process’s physical address space to be non-contiguous.