.4 Consider a microprocessor that has a block I/O transfer instruction such as that found on the 28000. Following its first execution, such an instruction takes five clock cycles to re-execute. However, if we employ a nonblocking I/O instruction, it takes a total of 20 clock cycles for fetching and execution. Calculate the increase in speed with the block I/O instruction when transferring blocks of 128 bytes.
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- 5. Consider two microprocessors having 8- and 16-bit-wide external data buses, respectively. The two processors are identical otherwise and their bus cycles take just as long. (a) Suppose all instructions and operands are one byte long, by what factor do the maximum data transfer rates differ?Consider a CPU with clock cycle of 10ns that executes program A in 100 clock cycles and access the memory for 50 times during the execution. The CPU uses the cache with miss rate of 7% and Miss Penalty time of 40 ns. Compare the CPU execution time with and without Cache missWe will explore the impact of cache capacity on performance, focusing exclusively on the data cache and excluding instruction storage in the caches. Cache access time is directly linked to its capacity. For the sake of simplicity, let's assume that accessing the main memory takes 100ns, and in a specific program, 50% of instructions involve data access. Two distinct processors, denoted as P1 and P2, are engaged in executing this program. Each processor is equipped with its own L1 cache. L1 size L1 Miss Rate L1 Hit Time P1 64 KB 3.6% 1.26 ns P2 128 KB 3.1% 2.17ns (a) What is the AMAT for P1 and P2 assuming no other levels of cache?
- Let's pretend for a moment that we have a byte-addressable computer with 16-bit main memory addresses and 32-bit cache memory blocks, and that it employs two-way set associative mapping. Knowing that each block has eight bytes, please calculate the size of the offset field and provide evidence of your calculations.In this problem, you will explore processor frequency in the context of the speed of light.Suppose you have overclocked a processor to 8,722.78MHz. This processor can execute one instruction per cycle. Further let us suppose that the system is accessing a magnetic disk (HD) with an access time of 11ms. 1. Suppose that you are designing the machine architecture and want to guarantee the CPU can obtain data from memory within 4 CPU cycles. Given that the address has to travel from the CPU to the memory unit (MMU) and that the data has to travel from memory to the CPU, what is the maximum distance between CPU and the MMU if the signal on the memory bus propagates at 75% of the speed of light?17. Consider the following hypothetical instruction: SubMem R1, mem1, mem2 This instruction works as follows: \[ \mathrm{R} 1 \leftarrow \text { [mem1] - [mem2] } \] In a multi-cycle datapath implementation, this instruction will: a. Use the MDR twice b. Use the ALU once c. Use the "shift to left" unit twice d. None of the above Answer: B 18. Consider the following hypothetical instruction: Mems mem1, R1, mem2 This instruction works as follows: \[ \text { [mem1] } \leftarrow \mathrm{R} 1 \text { - [mem2] } \] One of the following is correct about this instruction: a. It will not need theBregister b. It will require priting into MDR twice c. It will require writing into the ALUout three times d. None of the above Answer: A 19. By comparing the hypothetical instructions given in Questions (17) and (18), if we run these instructions on the same processor, then one of the following is correct: a. Both instructions have the same CPI b. Mems executes faster than SubMem c. SubMem executes…
- Suppose a given processor has access to two levels of memory. Level 1 contains 1000 words and has an access time of 0.01 μs; level 2 contains 100,000 words and has an access time of 0.1 μs. Assume that if a word to be accessed is in level 1, then the processor accesses it directly. If it is in level 2, then the word is first transferred to level 1 and then accessed by the processor. For simplicity, ignore the time required for the processor to determine whether the word is in level 1 or level 2. Suppose 95% of the memory accesses are found in level 1, define the hit ratio (H) and find the average access time.Consider a 32-bit computer with the MIPS assembly set, that executes the following code fragment loaded in memory in the address 0x0000000. li $t0, 1000 li $t1, 0 li $t2, 0 loop: addi $t1, $t1, 1 addi $t2, $t2, 4 beq $t1, $t0, loop This computer has a 4-way associative cache memory of 32 KB and lines of 16 bytes. Calculate the number of cache miss of the previous code, and the hit ratio, assuming that no other program is executing and that the cache memory is initially empty.In this exercise, we examine in detail how much an instruction is executed in a single-cycle Datapath. The problem refers to a clock cycle in which the processor fetches the following instruction word: 1010 1100 0110 0010 0000 0000 0001 0100. Assume that data memory is all zeros and that the processor's registers have the following values at the beginning of the cycle in which of the instruction word is fetched: (See image attached) What is the new PC address after this instruction is executed? Highlight the path through which this value is determined?
- Consider a 32 bit microprocessor that has on chip 32 K byte 4 way set associative cache. Block size of cache is two 32 bit words. The set number (in decimal) to which the word from memory location FAFEEBE1 wrapped.Consider a multilevel computer in which levels are vertically stacked, with the lowest level being level 1. Each level has instructions that are m times as powerful as those of the level below it; that is, one level r instruction can do the work of m instructions at level r-1. However, n instructions at level r-1 are required to interpret each instruction at level r. Given this, answer the following questions: If a level 1 program requires k seconds to run, how long would the equivalent program take to run at levels 2, 3 and 4. Express your answer in terms of n, m, and r. What is the performance implication for the program if n > m? Conversely, what is the implication if m > n? Which case do you think more likely? Why?Consider the following instruction, discussed in Example 8.6: MAC *AR2+, *AR3+, A Suppose the processor has three ALUs, one for each arithmetic operation on the addresses contained in registers AR2 and AR3 and one to perform the addition in the MAC multiply-accumulate instruction. Assume these ALUs each require one clock cycle to execute. Assume that a multiplier also requires one clock cycle to execute. Assume further that the register bank supports two reads and two writes per cycle, and that the accumulator register A can be written separately and takes no time to write. Give a reservation table showing the execution of a sequence of such instructions.