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Collect C method stats on railsbench #123

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Collect C method stats on railsbench #123

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26 changes: 26 additions & 0 deletions benchmarks/railsbench/benchmark.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,21 @@
rng = Random.new(0x1be52551fc152997)
visiting_routes = Array.new(visit_count) { possible_routes.sample(random: rng) }

c_calls = Hash.new { 0 }
c_loops = Hash.new { 0 }

TracePoint.new(:c_call) do |tp|
method_name = "#{tp.defined_class}##{tp.method_id}"
c_calls[method_name] += 1

case tp.method_id
when /(\A|_)each(_|\z)/, /(\A|_)map\!?\z/
c_loops[method_name] += tp.self.size if tp.self.respond_to?(:size)
when 'times'
c_loops[method_name] += Integer(tp.self)
end
end.enable

run_benchmark(10) do
visiting_routes.each do |path|
# The app mutates `env`, so we need to create one every time.
Expand All @@ -31,3 +46,14 @@
end
end
end

puts "Top C loop method iterations:"
c_loops.sort_by(&:last).reverse_each do |method, count|
puts '%8d %s' % [count, method]
end
puts

puts "Top 100 C method calls:"
c_calls.sort_by(&:last).reverse[0...100].each do |method, count|
puts '%8d %s' % [count, method]
end