b) Consider the profile in Figure 1. Answer the following questions, assuming that the serial execution time is Ts = 120. Essential/excess computation Interprocessor communication Idling (processor) 332 333 P6 P7 P5 P2 P1 (time/seconds) Figure 1: Profile of a parallel application executing on eight processors i) Calculate the parallel execution time, Tp of the execution? (2 marks) ii) Calculate the parallel efficiency, Ep, of the execution? (2 marks) iii) Calculate the total parallel overhead, To of the execution? (2 marks)