Cracking the Coding Interview - Fooo

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Solutions to Chapter 16 | Low Level 16 2 What is a Branch Target buffer? Explain how it can be used in reducing bubble cycles in cases of branch misprediction SOLUTION CareerCup com pg 82 Branch misprediction occurs when the CPU mispredicts the next instruction to be executed The CPU uses pipelining which allows several instructions to be processed simultaneously But during a conditional jump, the next instruction to be executed depends on the result of the condition Branch Prediction tries to guess the next instruction However, if the guess is wrong, we are penalized because the instruction which was executed must be discarded Branch Target Buffer (BTB) reduces the penalty by predicting the path of the branch, computing the target of the branch and caching the information used by the branch There will be no stalls if the branch entry found on BTB and the prediction is correct, otherwise the penalty will be at least two cycles 2 3 8
Solutions to Chapter 16 | Low Level 16 3 Describe direct memory access (DMA) Can a user level buffer / pointer be used by kernel or drivers? SOLUTION 2 3 9 Cracking the Coding Interview | Knowledge Based pg 82 Direct Memory is a feature which provides direct access (read/write) to system memory without interaction from the CPU The “DMA Controller” manages this by requesting the System bus access (DMA request) from CPU CPU completes its current task and grants access by asserting DMA acknowledgement signal Once it gets the access, it reads/writes the data and returns back the system bus to the CPU by asserting the bus release signal This transfer is faster than the usual transfer by CPU Between this time CPU is involved with processing task which doesn’t require memory access By using DMA, drivers can access the memory allocated to the user level buffer / pointer
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CRACKING THE C O D I N G I N T E R
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CRACKING THE C O D I N G I N T E R
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Table of Contents Foreword 4 Introd
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Dear Readers, CareerCup com Forewor
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My Approach Introduction The focus
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Behind the Scenes | The Microsoft I
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Behind the Scenes | The Google Inte
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Behind the Scenes | The Yahoo Inter
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Interview War Stories the next few
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Interview War Stories | Failure to
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Interview War Stories | You Can (Ma
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Before the Interview
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Before the Interview | Resume Advic
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Before the Interview | Behavioral P
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What You Need To Know Before the In
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At the Interview | Handling Behavio
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At the Interview | Handling Technic
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At the Interview | Handling Technic
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At the Interview | Five Algorithm A
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At the Interview | The Offer and Be
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At the Interview | Top Ten Mistakes
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At the Interview | Frequently Asked
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Interview Questions How This Book i
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Part 1 Data Structures
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Chapter 1 | Arrays and Strings 1 1
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2 1 Write code to remove duplicates
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Chapter 3 | Stacks and Queues 3 1 D
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Chapter 4 | Trees and Graphs 4 1 Im
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Chapter 5 | Bit Manipulation How to
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Chapter 6 | Brain Teasers Do compan
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Chapter 7 | Object Oriented Design
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Chapter 8 | Recursion How to Recogn
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Chapter 9 | Sorting and Searching H
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Chapter 10 | Mathematical How to Ap
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Chapter 11 | Testing Testing Proble
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Chapter 12 | System Design and Memo
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Part 3 Knowledge Based
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Chapter 13 | C++ 13 1 Write a metho
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Chapter 14 | Java 14 1 In terms of
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Chapter 15 | Databases 15 1 Write a
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Chapter 16 | Low Level 16 1 Explain
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Chapter 17 | Networking 17 1 Explai
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Chapter 18 | Threads and Locks 18 1
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Chapter 19 | Moderate 19 1 Write a
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Chapter 20 | Hard 20 1 Write a func
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Each problem may have many 'optimal
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Solutions to Chapter 1 | Arrays and
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Solutions to Chapter 2 | Linked Lis
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Approach 2: Solutions to Chapter 3
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Solutions to Chapter 3 | Stacks and
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Solutions to Chapter 4 | Trees and
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Solutions to Chapter 5 | Bit Manipu
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Solutions to Chapter 6 | Brain Teas
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Solutions to Chapter 7 | Object Ori
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41 } 42 } Overview: Solutions to Ch
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Solutions to Chapter 8 | Recursion
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Solutions to Chapter 9 | Sorting an
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Page 193 and 194: Solutions to Chapter 10 | Mathemati
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Page 231 and 232: Solutions to Chapter 14 | Java 14 1
Page 237 and 238: Solutions to Chapter 15 | Databases
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Solutions to Chapter 20 | Hard 20 p
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Solutions to Chapter 20 | Hard 20 1
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Solutions to Chapter 20 | Hard 32 m
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Solutions to Chapter 20 | Hard 17 }
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M matrixes 101, 102, 163, 169, 184,
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About the Author Gayle Laakmann’s
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Cracking the Coding Interview - Fooo

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