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#!/usr/bin/env ruby
# Example:
# tools/profile activesupport/lib/active_support.rb
ENV['NO_RELOAD'] ||= '1'
ENV['RAILS_ENV'] ||= 'development'
require 'benchmark'
module RequireProfiler
private
def require(file, *args) RequireProfiler.profile(file) { super } end
def load(file, *args) RequireProfiler.profile(file) { super } end
@depth, @stats = 0, []
class << self
attr_accessor :depth
attr_accessor :stats
def profile(file)
stats << [file, depth]
self.depth += 1
result = nil
elapsed = Benchmark.realtime { result = yield }
self.depth -= 1
stats.pop if stats.last.first == file
stats << [file, depth, elapsed] if result
result
end
end
end
GC.start
before_rss = `ps -o rss= -p #{Process.pid}`.to_i
path = ARGV.shift
if mode = ARGV.shift
require 'ruby-prof'
RubyProf.measure_mode = RubyProf.const_get(mode.upcase)
RubyProf.start
else
Object.instance_eval { include RequireProfiler }
end
elapsed = Benchmark.realtime { require path }
results = RubyProf.stop if mode
GC.start
after_rss = `ps -o rss= -p #{Process.pid}`.to_i
if mode
if printer = ARGV.shift
RubyProf.const_get("#{printer.to_s.classify}Printer").new(results).print($stdout)
elsif RubyProf.const_defined?(:CallStackPrinter)
File.open("#{File.basename(path, '.rb')}.#{mode}.html", 'w') do |out|
RubyProf::CallStackPrinter.new(results).print(out)
end
else
File.open("#{File.basename(path, '.rb')}.#{mode}.callgrind", 'w') do |out|
RubyProf::CallTreePrinter.new(results).print(out)
end
end
end
RequireProfiler.stats.each do |file, depth, sec|
if sec
puts "%8.1f ms %s%s" % [sec * 1000, ' ' * depth, file]
else
puts "#{' ' * (13 + depth)}#{file}"
end
end
puts "%8.1f ms %d KB RSS" % [elapsed * 1000, after_rss - before_rss]
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