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Operating System » Virtual Memory Thrashing

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Virtual Memory Thrashing

If the sum of the working – set sizes increases, exceeding the total number of available frames ____________

A. Then the process crashes
B. The memory overflows
C. The system crashes
D. The operating system selects a process to suspend

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A process is thrashing if ____________

A. It spends a lot of time executing, rather than paging
B. It spends a lot of time paging than executing
C. It has no memory allocated to it
D. None of the mentioned

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Thrashing _______ the CPU utilization.

A. Increases
B. Keeps constant
C. Decreases
D. None of the mentioned

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What is a locality?

A. A set of pages that are actively used together
B. A space in memory
C. An area near a set of processes
D. None of the mentioned

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When a subroutine is called ____________

A. It defines a new locality
B. It is in the same locality from where it was called
C. It does not define a new locality
D. None of the mentioned

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A program is generally composed of several different localities, which _____ overlap.

A. May
B. Must
C. Do not
D. Must not

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In the working set model, for: 2 6 1 5 7 7 7 7 5 1 6 2 3 4 1 2 3 4 4 4 3 4 3 4 4 4 1 3 2 3 if DELTA = 10, then the working set at time t1 (….7 5 1) is?

A. {1, 2, 4, 5, 6}
B. {2, 1, 6, 7, 3}
C. {1, 6, 5, 7, 2}
D. {1, 2, 3, 4, 5}

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The accuracy of the working set depends on the selection of ____________

A. Working set model
B. Working set size
C. Memory size
D. Number of pages in memory

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If working set window is too small ____________

A. It will not encompass entire locality
B. It may overlap several localities
C. It will cause memory problems
D. None of the mentioned

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If working set window is too large ____________

A. It will not encompass entire locality
B. It may overlap several localities
C. It will cause memory problems
D. None of the mentioned

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