Exercise 1.9

1. Assumptions (servers turned off = 45%)
2. Assumptions (servers in “barely alive” state = 45%)
3. Assumptions (voltage reduction = 33%; frequency reduction 62%)

 
 
Exercise 1.11

1. Assumptions (company computers = 8,500; MTTF for each computer = 26 days; catastrophic failure = ½ of computers failing)
2. Assumptions (extra cost of doubling MTTF per computer = $520)

 
 
Exercise 1.14

1. Assumptions (increased speedup of FPOs = 3x; FPOs = 31% of original program execution time)
2. Assumptions (speeding up the FPU resulted in 1.7x slowdown; data cache access = consumes 16% of execution time)
3. Unchanged

 
 
Exercise 1.15

1. Unchanged
2. Unchanged
3. Unchanged
4. Unchanged
5. Unchanged

 
 
Exercise 1.16

1. Assumptions (percentage of application that is parallelizable = 55%; communication cost = 0)
2. Assumptions (# of processors = 12; communication overhead per each processor added = 0.72%)
3. Assumptions (# of processors = 12; 0.72% increase in communication overhead when number of processors is doubled)
4. Assumptions (communication overhead is increased by 0.72% of the original execution time whenever the # of processors is doubled)
5. Unchanged

 
 
 
 
 
Chapter 2 Questions (Answer all five)
 
Exercise 2.17

1. Unchanged
2. Unchanged
3. Unchanged

 
 
Exercise 2.18

1. Unchanged
2. Unchanged
3. Unchanged
4. Unchanged

 
 
Exercise 2.21

1. Unchanged
2. Unchanged
3. Unchanged

 
 
Exercise 2.36
 
 
Exercise 2.40