# 10CS74 Advanced Computer Architectures Question Bank

Visvesvaraya Technological University - VTU
Question Bank
B.E./B.Tech. DEGREE EXAMINATION
(Regulation/Scheme 2010)
Fifth Semester - 7th
Computer Science Engineering - CSE
(Common to Information Science Engineering)

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1. Explain evolution of Computer Architecture.
2. Explain computer development milestones.
3. Explain 7 dimensions of an Instruction Set Architecture (ISA) in details.
4. Discuss Amdahl’s law.
5. Assume a disk subsystem with the following components and MTTF:
o 10 disks, each rated at 1,000,000 hour MTTF o 1 SCSI controller, 500,000 hour MTTF
o 1 power supply, 200,000 hour MTTF o 1 fan, 200,000 hour MTTF
o 1 SCSI cable, 1,000,000 hour MTTF
Using the assumptions that the lifetimes are exponentially distributed and that failure are independent; compute the MTTF of the system as a whole.
6. Find the number of dies per 300mm (30 cm) wafer for a die that is 1.5 cm on a side, where the die area is 2.25 cm2 .
7. Find the die yield for dies that are 1.5 cm on a side and 1.0 cm on a side, assuming a defect density of 0.4 per cm2 and α is 4.
8. Suppose we want to enhance the processor used for Web serving. The new processor is 10 times faster on computation in the Web serving application than
the original processor. Assuming that the original processor is busy with computation 40% of the time and is waiting for I/O 60% of the time, what is the overall speedup gained by incorporating the enhancement?
9. Explain the processor performance equation.
10. Given an unpipelined processor with a 10ns cycle time and pipeline latches
with  0.5ns latency, What are  the  cycle  times  of pipelined versions of the
processor with 2,4,8 and 16 stages if the datapath logic is evenly divided among the pipeline stages? Also what is the latency of each of the pipelined versions of the processor?
11. Suppose we have made the following measurements:
Frequency of FP operations = 25%, Average CPI of FP operations = 4.0
Average CPI of other instructions = 1.33, Frequency of FPSQR = 2% CPI of FPSQR = 20
Assume that the two design alternatives are to decrease the CPI of FPSQR to 2 or to decrease the average CPI of all FP operations to 2.5. Compare these two design alternatives using the processor performance equation.
12. Define computer architecture. Illustrate the seven dimensions of an ISA.
13. What is dependability? Explain two main measures of dependability.
14. List  and  explain  four  important  technologies  ,  which  have  led  to  the
improvements in computer system.
15. The given data presents the power consumption of several computer system
components: 7*
Component Product Performance Power
Processor SunNiagara8core 1.2Ghz 72-79W
DRAM Kingston 1GB 184-Pin 3.7w
Hard drive Diamond Max 7200 rpm 7.9 W Read
4.0 W idle
i)  Assuming  the  maximum  load  for  each  component,  a  power  supply
efficiency of 70%, what wattage must the server’s power supply deliver to a
system with a sun Niagara 8 core chip, 2 GB 184 Kingston DRAM and 7200 rpm hard drives?
ii) How much power will the 7200 rpm disk drive consume, if it is idle roughly 40% of the time?
iii) Assume that for the same set of requests, a 5400 rpm disk will require
twice as much time to read data as a 10800 rpm disk. What percentage of
time would the 5400 rpm disk drive be idle to perform the same transaction as in part (ii)
16. We will run two applications on dual Pentium processor, but the resource requirements are not the same. The first application needs 80% of the resources, and the other only 20% of the resources.
i) Given that 40% of the first application is parallelizable, how much
speed up will we achieve with that application, if run in isolation?
ii) Given that 99% of the second application is parallelizable, how much speed up will this application observe, if run in isolation?
iii) Given that 40% of the first application is parallelizable, how much overall system speedup would you observe, if we parallelized it? 6*

1.Give 2 significant changes in computer marketplace that made it easier to be
commercially successful with a new architecture.

2.Give the 2 effects occurred due to the dramatic growth rate in the 20th century .
3.Explain different classes of computers.

4.Differentiate desktop,Server & embedded computing classes based on their 3 system
characteristics.

5.Define Computer Architecture.

6.Explain Instruction Set Architecture with its 7 dimensions using illustration of MIPS &
80x86.

7.Give basic instruction & floating point instruction formats for MIPS.

8. Explain different instruction type or opcode for MIPS64.

9.Discuss the terms Organization & hardware with respect to designing of computer
architecture.