High Performance Computing MCQ Questions and Answers UNIT – 4 What is High performance computing ? HPC – High Performance Computing is the use of parallel processing for running advanced application programs efficiently, reliably and quickly. The term applies especially to systems that function above a teraflop or 1012 floating-point operations per second. The term HPC is occasionally used as a synonym for supercomputing, although technically a supercomputer is a system that performs at or near the currently highest operational rate for computers. Some supercomputers work at more than a petaflop or 1015 floating-point operations per second.

## High Performance Computing MCQ UNIT – 4

high performance computing mcq questions and answers

- mathematically efficiency is

e=s/p

e=p/s

e*s=p/2

e=p+e/e

Answer: e=s/p

- Cost of a parallel system is sometimes referred to____ of product

work

processor time

both

none

Answer: both

- Scaling Characteristics of Parallel Programs Ts is

increase

constant

decreases

none

Answer: constant

- Speedup tends to saturate and efficiency _ as a consequence of Amdahl’s law.

increase

constant

decreases

none

Answer: decreases

- Speedup obtained when the problem size is
**__**linearly with the number of processing elements.

increase

constant

decreases

depend on problem size

Answer: increase

- The n × n matrix is partitioned among n processors, with each processor storing complete
*_*_ of the matrix.

row

column

both

depend on processor

Answer: row

- cost-optimal parallel systems have an efficiency of
**_**

1

n

logn

complex

Answer: 1

- The n × n matrix is partitioned among n2 processors such that each processor owns a _ element

n

2n

single

double

Answer: single

- how many basic communication operations are used in matrix vector multiplication

1

2

3

4

Answer: 3

- In DNS algorithm of matrix multiplication it used

1d partition

2d partition

3d partition

both a,b

Answer: 3d partition

high performance computing mcq sppu

- In the Pipelined Execution, steps contain

normalization

communication

elimination

all

Answer: all

- the cost of the parallel algorithm is higher than the sequential run time by a factor of __

3/2

2/3

3*2

2/3+3/2

Answer: 3/2

- The load imbalance problem in Parallel Gaussian Elimination: can be alleviated by using a __

mapping

acyclic

cyclic

both

none

Answer: acyclic

- A parallel algorithm is evaluated by its runtime in function of

the input size,

the number of processors,

the communication parameters.

all

Answer: all

- For a problem consisting of W units of work, p__W processors can be used optimally

a)<=

b)>=

c)<

d)>

Answer: a)<=

- C(W)__Θ(W) for optimality (necessary condition).

>

<

<=

equals

Answer: equals

- many interactions in oractical parallel programs occur in
*__*pattern

well defined

zig-zac

reverse

straight

Answer :well defined

- efficient implementation of basic communication operation can improve

performance

communication

algorithm

all

Answer: performance

- efficient use of basic communication operations can reduce

development effort

software quality

both

none

Answer: development effort

high performance computing mcq questions

- Group communication operations are built using
**_**Messenging primitives.

point-to-point

one-to-all

all-to-one

none

Answer: point-to-point

- one processor has a piece of data and it need to send to everyone is

one -to-all

all-to-one

point -to-point

all of above

Answer: one -to-all

- wimpleat way to send p-1 messages from source to the other p-1 processors

Algorithm

communication

concurrency

receiver

Answer: concurrency

- In a eight node ring, node __ is source of broadcast

1

2

8

0

Answer: 0

- The processors compute __ product of the vector element and the local matrix

local

global

both

none

Answer: local

- one to all broadcast use

recursive doubling

simple algorithm

both

none

Answer: recursive doubling

- In a broadcast and reduction on a balanced binary tree reduction is done in __

recursive order

straight order

vertical order

parallel order

Answer: recursive order

- if “X” is the message to broadcast it initially resides at the source node

1

2

8

0

Answer: 0

- logical operators used in algorithm are

XOR

AND

both

none

Answer: both

- Generalization of broadcast in Which each processor is

Source as well as destination

only source

only destination

none

Answer: Source as well as destination

- The algorithm terminates in _ steps

p

p+1

p+2

p-1

Answer: p-1

- Each node first sends to one of its neighbours the data it need to….

broadcast

identify

verify

none

Answer: broadcast

- The second communication phase is a columnwise __ broadcast of consolidated

All-to-all

one -to-all

all-to-one

point-to-point

Answer: All-to-all

- All nodes collects _ message corresponding to √p nodes to their respectively

√p

p

p+1

p-1

Answer: √p

- It is not possible to port __ for higher dimensional network

Algorithm

hypercube

both

none

Answer: Algorithm

- If we port algorithm to higher dimemsional network it would cause

error

contention

recursion

none

Answer: contention

- In the scatter operation __ node send message to every other node

single

double

triple

none

Answer: single

- The gather Operation is exactly the inverse of _

scatter operation

recursion operation

execution

none

Answer: scatter operation

- Similar communication pattern to all-to-all broadcast except in the_____

reverse order

parallel order

straight order

vertical order

Answer: reverse order

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