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ruby_prof_callgrind_kcachegrind

🐢 Profiling with Callgrind Output and KCachegrind​

For deep call-stack analysis, use ruby‑prof’s CallTreePrinter to emit Callgrind‑compatible data and inspect hot paths in KCachegrind. This lets you drill into inclusive vs. exclusive times and visualize call hierarchies graphically.

require 'ruby-prof'

RubyProf.measure_mode = RubyProf::WALL_TIME
result = RubyProf.profile do
  # Your complex workload here
  10_000.times { Math.sqrt(rand) }
end

File.open("callgrind.out.#{Process.pid}", 'w') do |f|
  RubyProf::CallTreePrinter.new(result).print(f)
end

Then run:

kcachegrind callgrind.out.$PID