What are the best practices for benchmarking in C++11?

What are the best practices for benchmarking in C++11?

When benchmarking in C++11, it's important to ensure that your tests are accurate and reliable. Here are some best practices:

1. Use high-resolution timers like std::chrono.
2. Avoid compiler optimizations that can skew results.
3. Run benchmarks multiple times to get an average.
4. Isolate the code being tested to minimize interference.

How can I avoid compiler optimizations during benchmarking?

To avoid compiler optimizations, you can use specific flags when compiling your code. For example, using -O0 with GCC or Clang disables optimizations. Additionally, you can use the volatile keyword for variables that you want to ensure are not optimized away.

What tools can I use for benchmarking in C++?

There are several tools you can use for benchmarking in C++, including:

1. Google Benchmark - a popular library for micro-benchmarking.
2. Catch2 - a testing framework that also supports benchmarking.
3. Boost.Test - part of the Boost libraries, which includes benchmarking capabilities.

Can you explain how to use Google Benchmark?

Sure! To use Google Benchmark, you need to include the library in your project. Then, define your benchmark functions using the BENCHMARK macro. Finally, call benchmark::RunSpecifiedBenchmarks() in your main function to execute the benchmarks. Make sure to link against the benchmark library when compiling.