benchmark
A C++ library for microbenchmarking code snippets, providing a framework similar to unit tests for performance measurement.
What is benchmark?
Google Benchmark is a C++ library for microbenchmarking code snippets, providing a framework to measure and compare the performance of small, critical sections of code. It helps developers identify performance bottlenecks, optimize algorithms, and prevent performance regressions by treating benchmarks similarly to unit tests.
C++ developers and performance engineers who need to measure and optimize the execution time of specific functions, algorithms, or data structures in their applications.
Developers choose Google Benchmark for its accuracy, ease of integration with CMake and existing C++ projects, and its robust statistical reporting that provides reliable performance insights comparable to industry-standard testing practices.
Overview
A microbenchmark support library
Use Cases
Best For
- Comparing the performance of different algorithm implementations in C++
- Measuring the impact of compiler optimizations on specific code paths
- Identifying performance regressions in continuous integration pipelines
- Benchmarking data structure operations like insertions, deletions, or lookups
- Testing the scalability of multithreaded or parallel code
- Profiling small, frequently called functions in performance-critical applications
Not Ideal For
- Projects strictly adhering to C++11 or earlier standards, as it requires C++17 to build.
- Teams needing out-of-the-box graphical visualization for benchmark results, as it focuses on console-based statistical output.
- Developers looking for a lightweight, header-only benchmarking solution without library dependencies.
Pros & Cons
Pros
Uses a simple BENCHMARK macro similar to unit testing frameworks, making it easy to define and register benchmark functions, as shown in the basic usage example with BM_StringCreation.
Provides comprehensive metrics like mean, median, and standard deviation, helping analyze performance variability accurately, as highlighted in the features list.
Offers CMake targets like benchmark::benchmark for easy linking via find_package or add_subdirectory, simplifying project setup as described in the usage section.
Supports parameterized benchmarks and multithreaded code, allowing performance testing across different inputs and concurrency levels, per the key features.
Cons
Requires C++17 to build, which may exclude projects using older compilers or standards, as explicitly stated in the requirements section.
Needs Google Test for building and running tests, adding complexity unless disabled with -DBENCHMARK_ENABLE_GTEST_TESTS=OFF, as noted in the installation steps.
Newer features on the v2 branch are experimental and lack API stability, which might not be suitable for production use, as warned in the stable vs experimental section.
Frequently Asked Questions
Related Projects
googletestGoogleTest - Google Testing and Mocking Framework
Google MockGoogleTest - Google Testing and Mocking Framework
Catch2A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later (C++11 support is in v2.x branch, and C++03 on the Catch1.x branch)
doctestThe fastest feature-rich C++11/14/17/20/23 single-header testing framework
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