Debugging Ruby
summary
Shows exact tooling and outcomes: uses perf tools sampling profiler (38 samples with 4 in GC) and RubyProf for call-level hotspots, ports MPR/mov to 1.9 to pinpoint leaking lines, and uses GDB.rb and rbtrace to inspect live processes. Demonstrates GC profiler output with 53 GCs and object counts climbing toward ~2 million, uses m.dump to JSON for a web visualizer, and shows where allocations (file and line) produce the leak so fixes can be targeted.
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chapters (13)
- 0:00Introduction to profiling
- 1:00Debugging Ruby crashes
- 2:27Importance of profiling tools
- 4:45CPU profiling tools overview
- 7:15Using perftools.rb
- 15:15Using Ruby Prof
- 20:35LL Prof tool
- 21:55Memory profiling intro
- 23:45GC profiling in Ruby 1.9
- 28:45MPR for memory leaks
- 35:00Dumping heap data
- 37:40Debugging live processes
- 40:30Alternative tools and conclusion
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