Open Source Project


Fmtlog is a high-performance C++ logging library styled after fmtlib, delivering logging with nanosecond latency.


Fmtlog is a logging library for C++ applications that emphasizes high performance, leveraging the style and formatting approach of fmtlib, a popular C++ formatting library. This choice allows developers familiar with fmtlib to easily adopt fmtlog for logging purposes, benefiting from a familiar syntax and formatting capabilities. The primary aim of fmtlog is to offer fast logging solutions, achieving nanosecond latency in log message processing, which is particularly advantageous in applications where performance and speed are critical.

The library’s performance has been rigorously tested across various scenarios, including those that simulate high levels of stress on the system. These tests have demonstrated fmtlog’s ability to maintain its speed and stability, showcasing its robustness even under pressure. One of the ways fmtlog ensures such high performance is by potentially dropping logs in situations where the application is under extreme stress. This mechanism helps in preserving the overall performance of the logging process, though it introduces a trade-off where some log messages might be lost in order to keep the logging operation swift and efficient.

This characteristic of fmtlog points to its suitability for applications where speed is more critical than complete log retention. Developers using fmtlog can benefit from its fast, fmtlib-style logging capabilities, making it an attractive choice for high-performance C++ applications that require efficient logging without significant impact on the application’s speed. However, it’s essential for users to be aware of the potential for log message loss in high-pressure situations and consider this factor when choosing fmtlog for their logging needs.

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