Computer System Architecture - Multiprocessors

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1. Assume that you have a set of programs and each program is 100% parallelizable. Your objective is to run the programs in less amount of time. Which one of the following computer systems gives better throughput?

A
One uniprocessor that executes ten billion instructions per second.
B
Eight-processor multiprocessor where each processor executes one billion instructions per second.
C
Four-processor multiprocessor where each processor executes two billion instructions per second.
D
Thousand -processor multiprocessor where each processor executes ten million instructions per second.

Answer
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Option : A
Explanation :

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2. Suppose a computer program has a method M that cannot be parallelizable, and remaining parts of the program can be parallelized. The method M accounts for 40% of the program’s execution time. How much maximum speedup that can be achieved by running the program on a 6-core processor.

Answer
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Option : B
Explanation :

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3. In a simultaneous multi threaded environment, which of the following is/are not shared by threads ?

Answer
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Option : A
Explanation : Option A, B and D are correct.

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4. Suppose a program created a binary search tree (BST) with 1000 nodes. We are performing some basic operations (insert, remove, search) on a BST infinitely often by using the program. The probability to perform each operation is same. If we use the the following multi threading technique(s) while performing operations on BST.
I. Coarse-Grain Multi threading
II. Fine-Grain Multi threading
Which multi threading technique(s) give better throughput?(Assume that program is running on a 8-core multiprocessor)

Answer
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Option : B
Explanation :

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5. What does the term "Non-uniform" signify in Non Uniform Memory Access (NUMA) architecture.

Answer
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Option : A
Explanation :

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