(c) Assume 80% of instruction fetch operations are completed in one clock cycle and 20% are completed in 4 clock cycles. In addition, on average, the memory stage of a Load or Store instruction is completed in 3 clock cycles. What will be the rate of instruction execution (ie average number of instructions executed per second)?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Please answer only the letter (c). Thank you

Assignment 1: A RISC processor that uses the five-stage instruction fetch and execution design
introduced in Chapter 5 is driven by a 3-GHz clock. Instruction statistics in a large program are as
follows:
Branch
10%
Load
40%
Store
30%
Arithmetic and logic instructions
20%
Assume all the instructions need these five stages to complete, and there is no pipelined execution.
Please answer the following questions.
(a) Assume the memory access operation is always completed in one clock cycle. What will be the
rate of instruction execution (ie average number of instructions executed per second)?
(b) Assume the memory access operation is always completed in one clock cycle. What is the
frequency of memory access operations (ie average number of memory access operations per second)
when the program is executed?
(c) Assume 80% of instruction fetch operations are completed in one clock cycle and 20% are
completed in 4 clock cycles. In addition, on average, the memory stage of a Load or Store instruction
is completed in 3 clock cycles. What will be the rate of instruction execution (ie average number of
instructions executed per second)?
Transcribed Image Text:Assignment 1: A RISC processor that uses the five-stage instruction fetch and execution design introduced in Chapter 5 is driven by a 3-GHz clock. Instruction statistics in a large program are as follows: Branch 10% Load 40% Store 30% Arithmetic and logic instructions 20% Assume all the instructions need these five stages to complete, and there is no pipelined execution. Please answer the following questions. (a) Assume the memory access operation is always completed in one clock cycle. What will be the rate of instruction execution (ie average number of instructions executed per second)? (b) Assume the memory access operation is always completed in one clock cycle. What is the frequency of memory access operations (ie average number of memory access operations per second) when the program is executed? (c) Assume 80% of instruction fetch operations are completed in one clock cycle and 20% are completed in 4 clock cycles. In addition, on average, the memory stage of a Load or Store instruction is completed in 3 clock cycles. What will be the rate of instruction execution (ie average number of instructions executed per second)?
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