Operating System (OS)
Feed back queue

are very easy to implement
require manual intervention to implement properly
dispatch tasks according to execution characteristics
None of these
are used to favor real-time tasks

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Operating System (OS)
The necessary conditions needed before deadlock can occur?

Mutual Exclusion, Hold and wait, No Preemption, Circular Wait
Mutual Exclusion, No Hold and wait, Preemption, Circular Wait
No Mutual Exclusion, Hold and wait, Preemption, Circular Wait
Mutual Exclusion, Hold and wait, Preemption, No Circular Wait

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Operating System (OS)
Thrashing

always occurs on large computers
None of these
is a natural consequence of virtual memory systems
can always be avoided by swapping
can be caused by poor paging algorithms

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