In this post we try to answer the questions “what are premature optimizations?”
All posts tagged c++
Flexibility and Performance
In this post we talk about how to write code that is both flexible and fast!
Speedscope: visualize what your program is doing and where it is spending time
In this post we introduce Speescope, a useful tool to help you visualize what your program is doing and where it is spending time.
The true price of virtual functions in C++
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
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:…
Use explicit data prefetching to faster process your data structure
When processing (searching, inserting etc) your data structure, if you are accessing it in random-access fashion, the performance will suffer due to many data cache misses. Read on how to use the explicit data prefetching to speed up access to your data structure.
Excessive copying in C++ and your program’s speed
We talk about C++ and its weakness for temporary objects and excessive copying. We also give some tips on how to avoid them and make your program faster.