Answer :
Final answer:
To calculate the execution time, multiply the count of each instruction by its CPI and clock period, then sum them up. After performing the calculations, the execution time is 1272.0 microseconds, but this does not match the given options.
Explanation:
The calculation of the execution time for a set of instructions on a processor involves taking into account the clock period and the cycles per instruction (CPI) for each instruction class. To compute the total execution time, we multiply the count of each instruction class by its respective CPI and then by the clock period. Then we sum these values to find the total time.
- Calculate the total number of cycles for each instruction class: Instruction Count × CPI.
- Sum the total cycles from all instruction classes.
- Multiply the total cycles by the clock period to obtain the execution time.
Here's how we calculate it:
- For Instruction Class 1: 9 instructions × 8 CPI = 72 cycles
- For Instruction Class 2: 5 instructions × 3 CPI = 15 cycles
- For Instruction Class 3: 9 instructions × 8 CPI = 72 cycles
- Sum of cycles = 72 + 15 + 72 = 159 cycles
- Execution time = 159 cycles × 8 microseconds/cycle
The final execution time is 1272 microseconds. To provide the answer closest to this value, we would round to the nearest tenths place, resulting in 1272.0 microseconds. However, as this value doesn't match any of the options provided, let's double-check our calculations to make sure we've done them correctly.
