Assignment No. 04 Semester Spring 2009 AdvanceComputer Architectuer-CS501 TotalM

Question

                          Assignment No. 04 Semester Spring 2009 AdvanceComputer Architectuer-CS501                    TotalMarks: 15 Due Date: 29/05/2009

Q-1      Supposethat a certain program takes 300 seconds of elapsed time toexecute. Out of these 300 seconds, 280seconds is the CPU timeand the rest is I/O time.         What will be theelapsed time?                                                                  [5]

Q-2     Consider anI/O bus that can transfer 6 bytes of data in one bus cycle.    Suppose that a designer is planning to attachthe following two components     to this bus. Harddrive with a transfer rate of 100 Mbytes/sec Video card      with atransfer rate of 128 M bytes/secWhat will be the maximum          bandwidthfrom these two components? (The maximum frequency of the bus is 30MHz)                                                                                                   [5]

Q-3     Whatpercentage of time will a 20 MIPS processor spend in the busy wait          loop of an85-character line printer when it takes 2 msec to print a character         and a total of 765instructions need to be executed to print an 85 character line?Assume that 4 instructions are executed in the polling loop?          [5]

Explanation / Answer

Elapsed time = CPU Time + I/O Time

The total number of instructions = 765

Out of 765 instructions executed to print a line, 85 x 4=340 is required forpolling        

The percentage of the total time is 84.97/85 = 99.96%.

I hope this will helps to you

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