Book Image

Advanced C++

By : Gazihan Alankus, Olena Lizina, Rakesh Mane, Vivek Nagarajan, Brian Price
5 (1)
Book Image

Advanced C++

5 (1)
By: Gazihan Alankus, Olena Lizina, Rakesh Mane, Vivek Nagarajan, Brian Price

Overview of this book

C++ is one of the most widely used programming languages and is applied in a variety of domains, right from gaming to graphical user interface (GUI) programming and even operating systems. If you're looking to expand your career opportunities, mastering the advanced features of C++ is key. The book begins with advanced C++ concepts by helping you decipher the sophisticated C++ type system and understand how various stages of compilation convert source code to object code. You'll then learn how to recognize the tools that need to be used in order to control the flow of execution, capture data, and pass data around. By creating small models, you'll even discover how to use advanced lambdas and captures and express common API design patterns in C++. As you cover later chapters, you'll explore ways to optimize your code by learning about memory alignment, cache access, and the time a program takes to run. The concluding chapter will help you to maximize performance by understanding modern CPU branch prediction and how to make your code cache-friendly. By the end of this book, you'll have developed programming skills that will set you apart from other C++ programmers.
Table of Contents (11 chapters)
6. Streams and I/O

Runtime Profiling

Profiling is a non-intrusive method of measuring the performance of the functions in a program. Profilers work by sampling a program's current execution address at frequent intervals (hundreds of times in a second) and making a log of which functions happened to be executing at the time. This is a statistical sampling approach that has reasonable accuracy. Sometimes, though, the results can be confusing as a program may spend a lot of time on functions that are a part of the operating system kernel. The most popular runtime profiling tool on Linux is perf. In the next section, we'll make use of perf to profile our program.

Exercise 3: Using perf to Profile Programs

perf can be installed on Ubuntu as follows:

apt-get install linux-tools-common linux-tools-generic

To get familiar with the basics of using perf, we'll profile and analyze the program from the previous exercise with the help of the perf tool. Perform the following steps to complete this exercise: