Ruby Objects: A Walkabout
summary
Uses the TracePoint API to count runtime events and produce JSON summaries via a small Rack middleware; a tiny Rack app instantiates 1 class, 1 method and 1 dispatch, a Sinatra hello world creates 43 classes, 155 methods and 548 dispatched calls, and a minimal Rails example shows 361 classes, ~1,200 methods and ~8,600 dispatches. Uses the ObjectSpace API and the allocation_tracer gem to measure rough memsize, flagging a line that allocates 10,004 objects and a multi-assignment that creates 5,000 arrays until the code is rewritten.
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chapters (8)
- 0:00Introduction
- 2:35About the speaker
- 5:58TracePoint overview
- 9:45TracePoint in practice
- 15:16ObjectSpace analysis
- 16:47Memory profiling
- 19:57Allocation tracer
- 27:06Conclusion
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