Operating System (OS)
What do you mean by Memory Compaction?

Combine multiple small memory holes into one big hole
Divide memory hole by 2
Divide big memory hole into small holes
Combine multiple equal memory holes into one big hole

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Operating System (OS)
A co-processor

Works with any application
Is quite common in modern computer
Is relatively easy to support in software
Causes all processor to function equally

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Operating System (OS)
You should choose sleep option when

You are leaving for a very short time and want to resume you work shortly
You finish working and going to bed
When computer gets hanged frequently. Let it sleep for some time
The computer is tired after working for the whole day

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