Paweł Urbanek • 5/12/2026

Lessons Learned Building High-Performance Rust Profiler

This article details the author's experience building 'hotpath-rs', a Rust profiler/debugging toolkit with over 100k downloads. It covers design decisions, low-level implementation details such as cache-line contention, async futures instrumentation, and decoding raw CPU traces into Rust symbols. The profiler combines multiple data sources into easy-to-parse reports using macros like hotpath::main and hotpath::measure. The post includes a code example demonstrating CPU-bound work, memory allocation, and async I/O, along with a sample report output showing timing, allocation, and CPU metrics.

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#performance #profiler #rust