Provide an explanation, accompanied by diagrams, for the following memorymanagement strategies: (i) Methods for Partition Allocation. (ii)Paging and theTranslation Look-aside Buffer.
Question
Provide an explanation, accompanied by diagrams, for the following memorymanagement strategies: (i) Methods for Partition Allocation. (ii)Paging and theTranslation Look-aside Buffer.
Solution
(i) Methods for Partition Allocation:
Partition allocation is a memory management strategy that involves dividing the computer's memory into sections or partitions. There are three main methods for partition allocation: fixed partitioning, dynamic partitioning, and relocatable dynamic partitioning.
- Fixed Partitioning: In this method, the memory is divided into fixed-sized partitions. Each partition can hold exactly one process. The main disadvantage of this method is that it can lead to internal fragmentation, where a partition may have unused space because the process it holds is smaller than the partition.
Diagram for Fixed Partitioning
- Dynamic Partitioning: In dynamic partitioning, the partitions are not fixed in size. Instead, when a process needs to be loaded into memory, a partition is created that is exactly the size of that process. This eliminates internal fragmentation but can lead to external fragmentation, where there is enough total memory space for a process but the space is not contiguous.
Diagram for Dynamic Partitioning
- Relocatable Dynamic Partitioning: This method is similar to dynamic partitioning, but the partitions can be moved in memory to group the free memory together and avoid external fragmentation.
Diagram for Relocatable Dynamic Partitioning
(ii) Paging and the Translation Look-aside Buffer:
Paging is another memory management strategy that also involves dividing memory into sections, called pages. The main advantage of paging is that it eliminates external fragmentation.
In paging, each process is divided into pages of the same size as the memory frames. The pages are then loaded into any available frame in the memory. The operating system keeps track of all the pages in a page table.
The Translation Look-aside Buffer (TLB) is a hardware device that caches the recent translations of virtual memory to physical memory. It is used to reduce the time it takes to perform a memory access.
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