Given an instruction sequence with instructions in classes A, B, and C as the table below (same as the last two questions): Instruction Class A BC |CPI Instruction Count|10|40|10 2 1 3 Suppose we are considering improving the execution with the following restrictions: We can only select one class of instructions to improve; and • We will be able to reduce the execution time for the selected instruction class by 50%; No changes to other instructions. Which instruction class should we select to achieve the most improvement? class A class B class C Either one: the improvement will always be the same.

Given an instruction sequence with instructions in classes A, B, and C as the table below (same as the last two questions): Instruction Class A BC |CPI Instruction Count|10|40|10 2 1 3 Suppose we are considering improving the execution with the following restrictions: We can only select one class of instructions to improve; and • We will be able to reduce the execution time for the selected instruction class by 50%; No changes to other instructions. Which instruction class should we select to achieve the most improvement? class A class B class C Either one: the improvement will always be the same.

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

Problem 1PE

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Properties of different architectures

Software architectures are the blueprint of a software system. They consist of all components involved in a system, relations between various components, the environment of operation, and the principle used in designing the software. In other words, software architecture shows the organization of different software structures and helps understand their behavior.

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10. 10. Amdahl's Law is as applicable to software as it is to hardware. An oft-cited programming truism states that a program spends 90% of its time executing 10% of its code. Thus, tuning a small amount of program code can often have an enormous effect on the overall performance of a software product. Determine the overall system speedup if: 1. a) 90% of a program is made to run 10 times as fast (900% faster). 2. b) 80% of a program is made to run 20% faster.
Q3: Suppose there is a processing unit composed by CPU and I/O component. For a specific task, CPU takes 5 second to finish the execution and I/O takes 2 second to process. The communication time between CPU and I/O can be elimiate under this circumstance. Execution Time 7 second 5second 2 second CPU time I/O time If CPU time decreases by 25% per year for 3 years and I/O time decreases by 20% per year 1) How many times faster is this program after 3 years? 2) What percentage of new time is I/O? and what percentage of new time is CPU?
Suppose the implementation of an instruction set architecture uses three classes of instructions, which are called A, B, and C. The total dynamic instruction count is 1 x 10^7 and the processor's clock rate is 2.5 GHz. Details for the three classes are given in the table below: Class A B C ΙΑ Complete the following table. Express all answers in scientific notation and round to two decimal places, when needed. Class Instruction Count B CPI 1 2 3 C % of instructions 20% 50% 30% x 10^ x 10^ x 10^ Number of Clock Cycles x 10^ x 10^ x 10^
E In the following code block(Reference:Q11), you will a set of assembly instructions with corresponding line numbers (line numbers are for informational purpose only and they are not part of the source code). 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 mov edx, 5 dec ecx jmp LABEL1 mov eax, 1 LABEL1: mul edx jmp ecx mov edx, 0678h sub edx, eax jmp DWORD PTR [edx] neg ebx add ecx, ebx mov eax, 0 For each of the conditions/scenario listed below, indicate the corresponding line number (that cause or is associated with the condition/scenario). Enter 0 (Zero) if the condition is not caused by the block of code. 1) Memory indirect jump: type your answer... type your answer... type your answer... type your answer... 2) Register indirect jump: 3) Relative short jump: type your answer... 5) Two's complement type your answer... 4) Relative near jump: 6) Unreachable code