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Internal Fragmentation vs External Fragmentation
Internal Vs External Fragmentation
When a process is assigned to a memory block and if that process is smaller than the memory requested, it creates a free space in the assigned memory block. Then the difference between assigned and requested memory is called the internal fragmentation.
When the process is loaded or removed from the memory, a free space is created. This free space creates an empty space in the memory which is called external fragmentation.
|Internal Fragmentation||External Fragmentation|
|When Internal/External Fragmentation takes place||When fixed sized memory blocks are assigned to the processes||When the memory assigned to the process dynamically based on process request|
|Why does Internal/External Fragmentation occur||Memory is partitioned into fixed-sized blocks.||Memory is partitioned into variable size blocks|
|What is the alternative to overcome Internal/External Fragmentation||Internal fragmentation can be reduced effectively by dividing the memory into variable sized blocks and assigning the best-fit block to the process requesting for the memory.||External fragmentation can be eliminated by compaction, paging, and segmentation so that memory can be allocated in a non-contiguous manner to a process.|
In a nutshell, both internal and external fragmentation are natural process related to empty memory space or memory being wasted. However, the problem with both cases cannot be resolved entirely but can be mitigated to some extent with solutions given above.
- Memory Management Introduction
- Partition Allocation Method
- Buddy- System Allocator
- Types of Paging
- Mapping Virtual address to Physical Address.
- Virtual Memory
- Demand Paging
- Implementation of Demand paging and page fault
- Page Replacement Algorithms
- Belady’s Anomaly
- Static vs Dynamic Loading
- Static vs Dynamic Linking
- Translational Look Aside Buffer
- Process Address Space
- Difference between Segmentation and Paging