We talk about virtual functions, and how the performance of software with virtual functions depends on many factors: the cost of additional instructions, cache misses, branch prediction misses, instruction cache misses and compiler optimizations.
2-minute read: Class Size, Member Layout and Speed
We are exploring how class size and layout of its data members affect your program’s speed
Performance Tuning Contest: February 2021 edition
Take part in a performance tuning contest to learn more about performance tuning on a real world code.
Crash course introduction to parallelism: SIMD Parallelism
This is the first article about hardware support for parallelization. We talk about SIMD, an extension almost every processor nowadays has that lets you speed up your program.
2-minute read: How is Big O notation relevant on modern systems?
Big O notation is commonly used to describe algorithm performance. But modern hardware makes performance analysis much harder than it used to be. In this short article we give three interesting examples to illustrate the limits of big O notation.
Crash course introduction to parallelism: the algorithms
When it comes to performance, there are two ways to go: one is to improve the usage of the existing hardware resources, the other is to use the new hardware resources. We already talked a lot about how to increase the performance of your program by better using the existing resources, for example, by decreasing…
Making your program run faster in a multithreaded environment
We investigate the performance impact of multithreading.
2-minute read: the Magic Touch of Parallel Algorithms
We investigate a simple way to speed up std::sort from the standard library
2-minute read: What is faster, std::endl or ‘\n’?
A few days ago I wrote a small app to illustrate one of the articles I was preparing. Basically the program was loading a file from the hard disk, sorting it, and then outputting to another file only unique values (by omitting duplicates). The function for writing unique values to a file looks like this:…
Talk: The Price of Dynamic Memory in C and C++
Ivica Bogosavljević from Johny’s Software Lab gave a talk on November 26th, 2020 as part of C++ User Group Osnabrück related to the performance price the developers pay when they are using dynamic memory in C and C++.