MFT is a memory management technique in which the main memory is divided into fixed-sized partitions that remain constant throughout the system's operation. Each partition can contain exactly one process, and the operating system assigns processes to these partitions based on their size requirements.
Key Features:
Memory is divided into fixed partitions before processes are executed
Partitions can be of equal size or varying sizes
Each partition can only contain one process at a time
Simple to implement and manage
Fast process allocation and deallocation
Challenges:
Internal fragmentation occurs when a process is smaller than its assigned partition
Limited degree of multiprogramming based on number of partitions
Cannot accommodate processes larger than the largest partition
Inefficient memory utilization due to fixed partition sizes
Multiprogramming with Variable number of Tasks (MVT)
MVT is a memory management technique in which memory is allocated to processes dynamically as needed. The size of partitions is not fixed and varies according to the size of the processes. This technique allows for more efficient memory utilization as partitions are created based on actual process requirements.
Key Features:
Memory is allocated dynamically as per process requirements
No fixed partition size - each process gets exactly what it needs
More efficient memory utilization compared to MFT
Supports a variable number of processes in memory
Can accommodate larger processes if sufficient contiguous memory is available
Challenges:
External fragmentation occurs as processes are loaded and removed
Requires complex memory management algorithms
May need compaction to consolidate free memory spaces
Allocation and deallocation of memory is more time-consuming