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Operating Systems Essential Managers (Memory manager (Single User…
Operating Systems Essential Managers
Memory manager
Single User Contiguous: First scheme of memory management
Only one job would occupy memory at a time
Not very efficient
If a Job was too large for memory it just couldn't be handled
Fixed Partitions: second scheme of memory management
Memory divided into partitions which were recorded in a partition memory table
Partition sizes were static and could only be changed upon rebooting
Dynamic partitions: current scheme of memory management
Jobs only receive as much memory as they request upon loading
First fit: finds the first partition available to place a job in
Best fit: finds the most close-fitting partition to store jobs in (slower performance, better efficiency
File Manager
Determine how file should be stored
Allocate and deallocate files when users have been cleared for access
Determine where each file should be stored
Device Manager
Process Manager
Clock speed: speed at which processor can execute instructions
Processes can be in 5 states: Hold, Run, Wait, Ready, Finish
Network Manager
Search and List the responsibilities of each OS Manager :