magic-trace
github.com/janestreet/magic-trace- Category
- Developer Tools
- Pricing
- Open Source
- Platform
- cli
- Type
- TOOL
- GitHub
- 6.2k stars
- Added
- May 27, 2026
About
A high-resolution process tracing tool that captures every function call with ~40ns precision using Intel Processor Trace. Unlike traditional sampling profilers, it records complete control flow history leading up to specific events, making it easier to debug performance issues and understand what code is actually doing.
Why it made the leaderboard
Jane Street's tracing tool built on Intel Processor Trace: it records every function call at ~40ns resolution — complete control flow leading up to an event, not samples — with 2-10% overhead and no code changes. When a sampling profiler shrugs, this shows you exactly what happened.
Tags
profilingdebuggingperformancetracingintelclisystems
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