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real time system requires high availabity
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Dispatcher module gives control of the CPU to the process selected by the short-term scheduler; this involves
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Selects from among the processes in memory that are ready to execute,
and allocates the CPU to one of them. CPU scheduling decisions may take
place when a process: 1.Switches from running to waiting state.
2.Switches from running to ready state. 3.Switches from waiting to
ready. 4.Terminates. Scheduling under 1 and 4 is non-preemptive. All
other scheduling is preemptive.
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Switching the CPU to another process requires saving the state of the
old process and loading the saved state for the new process.
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Hard disk is the secondary storage device, which holds the data in
bulk, and it holds the data on the magnetic medium of the disk.Hard
disks have a hard platter that holds the magnetic medium, the magnetic
medium can be easily erased and rewritten, and a typical desktop
machine will have a hard disk with a capacity of between 10 and 40
gigabytes. Data is stored onto the disk in the form of files.
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Thrashing is caused by under allocation of the minimum number of pages
required by a process, forcing it to continuously page fault. The
system can detect thrashing by evaluating the level of CPU utilization
as compared to the level of multiprogramming. It can be eliminated by
reducing the level of multiprogramming.
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