Question # 10 Multiple Choice
Which of these characteristics and impacts of modern urban mass transit is least important?

Mass transit is more efficient for the business and municipality and less efficient for the customer.

Mass transit provides steady, practical transportation for millions of people.

Mass transit has led to a decline in the prestige of the commercial air travel industry.

The modern city and its associated neighboring suburbs are very recent developments, so the urban mass transit business model is also relatively new.

What operating system is a smartphone most likely to use? 1.bsd 2.mac os x 3.symbian 4.linux

The most complicated four letter word

When making changes to optimize part of a processor, it is often the case that speeding up one type of instruction comes at the cost of slowing down something else. for example, if we put in a complicated fast floating-point unit, that takes space, and something might have to be moved farther away from the middle to accommodate it, adding an extra cycle in delay to reach that unit. the basic amdahl's law equation does not take into account this trade-off. a. if the new fast floating-point unit speeds up floating-point operations by, on average, 2ă—, and floating-point operations take 20% of the original program's execution time, what is the overall speedup (ignoring the penalty to any other instructions)? b. now assume that speeding up the floating-point unit slowed down data cache accesses, resulting in a 1.5ă— slowdown (or 2/3 speedup). data cache accesses consume 10% of the execution time. what is the overall speedup now? c. after implementing the new floating-point operations, what percentage of execution time is spent on floating-point operations? what percentage is spent on data cache accesses?