Q. _________ replacement allows a process to select a replacement frame from the set of all frames, even if the frame is currently allocated to some other process.

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Q. _________ replacement allows each process to only select from its own set of allocated frames.

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Q. One problem with the global replacement algorithm is that :

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Q. ________ replacement generally results in greater system throughput.

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Q. A process is thrashing if :

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Q. Thrashing _______ the CPU utilization.

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Q. A locality is :

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Q. When a subroutine is called,

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

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Q. The accuracy of the working set depends on the selection of :

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Q. If working set window is too small :

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Q. If working set window is too large :

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Q. If the sum of the working – set sizes increases, exceeding the total number of available frames :

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Q. Which of the following is FALSE ?

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Q. The following program:

main()
{
if(fork()>0)
sleep(100);
}

results in the creation of:

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Q. The following C program executes :

main()
{
fork();fork();printf("yes");
}
prints yes:

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Q. A virtual memory system uses First In First Out (FIFO) page replacement policy and allocates a fixed number of frames to a process. Consider the following statements :

P : Increasing the number of page frames allocated to a process sometimes increases the page fault rate
Q : Some programs do not exhibit locality of reference

Which of the following is TRUE?

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Q. For 3 page frames, the following is the reference string :

7 0 1 2 0 3 0 4 2 3 0 3 2 1 2 0 1 7 0 1

How many page faults does the LRU page replacement algorithm produce ?

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Q. Applying the LRU page replacement to the following reference string :

1 2 4 5 2 1 2 4

The main memory can accommodate 3 pages and it already has pages 1 and 2. Page 1 came in before page 2.
How many page faults will occur ?

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Q. 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 :

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