a. What is Average CPl of machine M running a program P that has 31% Type 1 instructions, 29% Type 2 instructions, and the remainder Type 3 instructions? Answer with just a number. b What is the execution time if program Phas 15000 instructions and machine M has a clock rate of 4 GHz? Answer in microseconds, with 3 decimal places of precision. Just a number no units.

a. What is Average CPl of machine M running a program P that has 31% Type 1 instructions, 29% Type 2 instructions, and the remainder Type 3 instructions? Answer with just a number. b What is the execution time if program Phas 15000 instructions and machine M has a clock rate of 4 GHz? Answer in microseconds, with 3 decimal places of precision. Just a number no units.

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter4: Processor Technology And Architecture

Section: Chapter Questions

Problem 2PE: If a microprocessor has a cycle time of 0.5 nanoseconds, what’s the processor clock rate? If the...

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Consider three different processors P1, P2, and P3 executing the same instructionset. P1 has a 3GHz clock rate and a CPI of 1.5. P2 has a 2.5GHz clock rate and a CPI of 1.0, P3has a 4GHz and a CPI of 2.5.a) Which processor has the highest performance expressed in instructions per second?b) If the processors each execute a program in 5 seconds, find the number of cycles and thenumber of instructions.c) We are trying to reduce the execution time by 20% but this leads to an increase of 15% inthe CPI. What clock rate should we have to get this time reduction?
Suppose we have two implementations:Machine A has a clock cycle time of 10 ns. and a CPI of 2.0. Machine B has aclock cycle time of 20 ns. and a CPI of 1.2. Which machine is faster for thisprogram, and how much in percentage? Consider that the total instruction in the program is 1x10^9 or about 1,000,000,000 set of instructions since the cycle time is running in nanoseconds.
The following table shows the number of instructions for a program with two sequences:Arith Store Load Branch Totala. 650 100 600 50 1400b. 750 250 500 500 2000Assuming that arith instructions take 1 cycle, load and store 5cycles, and branches 2 cycles, and the clock rate is 2 GHz processor.a. Which one is faster?b. Find the CPI for the sequence.b. If the number of load instructions can be reduced by one half,what is the speedup?
Consider a machine with three instruction classes and CPI measurements as follows: Instruction class CPI of the instruction class A 2 B 5 C 7 Suppose that we measured the code for a given program in two different compilers and obtained the following data: Code sequence Instruction counts (in millions) A B C 1 15 5 3 2 25 2 2 Assume that the machine’s clock rate is 500 MHz. Which code sequence will execute faster according to MIPS? How much according to execution time of each code sequence?
A benchmark program is run on a 40 MHz processor. The executed program consists of 80000 instruction executions, with the following instruction mix and clock cycle count: Instr. Type Instr. Count CPI Move 45000 1 Math 20000 2 fixed point 10000 3 double 5000 4 Determine the execution time for this program? Hint: you must calculate the effective CPI, and MIPS first. a. 3.175 ms b. 1.588 ms c. 1.688 ms d. 3.375 ms
Q: Consider three different processors P1, P2, and P3 that support the same instruction set. P1 has a 3 GHz clock rate and a CPI of 1.5. P2 has a 2.5 GHz clock rate and a CPI of 1.0. P3 has a 4.0 GHz clock rate and has a CPI of 2.2. (a) Which processor has the highest performance expressed in instructions per second? Show your calculations. (b) If the processors each execute a program in 10 seconds, find the number of cycles and the number of instructions for each processor. (c) We are trying to reduce the execution time by 30% (i.e., execution time is reduced from 10 seconds to 7 seconds). However, this leads to an increase of 20% in the CPI. For each processor, what clock rate should we have to get this time reduction? (Show the calculations you did to answer this question.)
Consider three different processors P1, P2, and P3 executing the same instruction set. P1 has a 3 GHz clock rate and a CPI of 1.5. P2 has a 2.5 GHz clock rate and a CPI of 1.0. P3 has a 4.0 GHz clock rate and has a CPI of 2.2. Which processor has the highest performance expressed in instructions per second? If the processors each execute a program in 10 seconds, find the number of cycles and the number of instructions.
Consider two different implementations, M1 and M2, of the same instruction set. There are three classes of instructions (A, B, and C) in the instruction set. M1 has a clock rate of 2.0GHz and M2 has a clock rate of 2.5GHz. The average number of cycles for each instruction class and their frequencies (for a typical program) are as follow on the table. (a) Calculate the average CPI for each machine, M1, and M2.(b) Calculate the average MIPS ratings for each machine, M1 and M2
Suppose two CPU A and B have exactly the same circuits, but different clock frequencies. Answer the following questions: a) If the clock frequency of CPU A is 8MHz, how long is one clock cycle of CPU A? b) If the CPU A can execute 0.4 million instructions per second on average, how long is the average time to execute one instruction? c) What is the average number of clock cycle to execute one instruction for CPU A? d) The frequency of CPU B is 12MHz. What is the average number of instructions that can be executed per second?
Consider three different processors P1, P2, and P3 executing the same instruction set. P1 has a 3 GHz clock rate and a CPI of 1.5. P2 has a 2.5 GHz clock rate and a CPI of 1.0. P3 has a 4.0 GHz clock rate and has a CPI of 2.2. a. Which processor has the highest performance expressed in instructions per second? b. If the processors each execute a program in 10 seconds, find the number of cycles and the number of instructions. c. We are trying to reduce the execution time by 30% but this leads to an increase of 20% in the CPI. What clock rate should we have to get this time reduction?
Assume a program requires the execution of 75 ×106 FP instructions, 112 ×106INT instructions, 88 ×106 L/S instructions, and 12 × 106 branch instructions.The CPI for each type of instruction is 1, 3, 4, and 2, respectively. Assume thatthe processor has a 2 GHz clock rate.a) By how much must we improve the CPI of FP instructions if we wantthe program to run two times faster?b) By how much must we improve the CPI of L/S instructions if we wantthe program to run two times faster?c) By how much is the execution time of the program improved if theCPI of INT and FP instructions is reduced by 40% and the CPI of L/Sand Branch is reduced by 30%?
Your favorite computer program (after being converted to MIPS assembly code, then to machine code) results in 2.5e8 instructions. Consider the three different CPUs and their clock rates and CPIs and determine how much time it would take each of them to execute this program. Rick Sanchez’s computer with a clock rate 7.99 Hz (hertz, not gigahertz) and a CPI of 1.1.