Profiling with Ctrl-C

The article discusses the concept of "Ctrl-C profiling," a method of using a debugger to analyze a program's call stack by interrupting its execution. Initially dismissed by the author as ineffective for complex problems, the approach is now recognized for its practicality in addressing simpler issues, particularly in challenging environments. The author reflects on personal experiences transitioning from management back to programming, highlighting the ease of using Ctrl-C profiling over traditional profilers, which can be complex and misinterpreted. Examples illustrate how this method can quickly identify performance bottlenecks, such as slow startup times due to inefficient JSON parsing or linking issues with the LLD linker. While acknowledging the limitations of Ctrl-C profiling, such as its low sampling frequency and challenges in multi-threaded systems, the author advocates for its utility in many scenarios. The piece concludes by endorsing Ctrl-C profiling as a straightforward and effective tool, especially for those who may struggle with more sophisticated profiling techniques.

- Ctrl-C profiling is a practical method for quickly identifying performance issues in programs.

- The author reflects on personal experiences that highlight the ease of using this method over traditional profilers.

- Limitations of Ctrl-C profiling include low sampling frequency and challenges in multi-threaded environments.

- The approach is endorsed for its simplicity and effectiveness in solving common programming problems.

- Ctrl-C profiling can be particularly useful in unfriendly environments where traditional profiling tools may not be applicable.