DIY::Thread.profile -- Light-Weight Profiling in Pure Ruby
summary
Builds a light-weight sampling profiler in pure Ruby using the Thread APIs (notably thread.list and backtrace), running roughly 10 samples per second and aggregating counts into a call tree; measured overhead averages 1.7 milliseconds per sample so short production runs (2–15 minutes) are viable. It works but has gotchas: sampling favors IO over CPU, memory grows with retained trees, MRI 1.9.x and JRuby backtraces are flaky, and millisecond-scale tasks may be missed.
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