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tracepoint_custom_profile

🕵️ Custom Event Profiling with TracePoint​

When you need fine-grained insight beyond CPU timing—like tracking allocations or GC events—TracePoint allows hooking into Ruby’s VM events. You can build custom profilers that collect metrics on calls, returns, class definitions, or object allocations.

trace = TracePoint.new(:call, :return, :allocations) do |tp|
  case tp.event
  when :call
    puts "Calling: #{tp.defined_class}##{tp.method_id} at #{tp.path}:#{tp.lineno}"
  when :allocations
    puts "Allocated: #{tp.self.class} at #{tp.path}:#{tp.lineno}"
  end
end

trace.enable
# Run the code segment you want to inspect
do_complex_task
trace.disable