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#!/usr/bin/env ruby
# Example:
# tools/profile activesupport/lib/active_support.rb [ruby-prof mode] [ruby-prof printer]
ENV['NO_RELOAD'] ||= '1'
ENV['RAILS_ENV'] ||= 'development'
module CodeTools
class Profiler
attr_reader :path, :mode
def initialize(path, mode=nil)
@path, @mode = path, mode
require 'benchmark'
end
def profile_requires
GC.start
before_rss = `ps -o rss= -p #{Process.pid}`.to_i
if mode
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
puts "RubyProf outputting to stderr with printer #{printer}"
RubyProf.const_get("#{printer.to_s.classify}Printer").new(results).print($stdout)
elsif RubyProf.const_defined?(:CallStackPrinter)
filename = "#{File.basename(path, '.rb')}.#{mode}.html"
puts "RubyProf outputting to #{filename}"
File.open(filename, 'w') do |out|
RubyProf::CallStackPrinter.new(results).print(out)
end
else
filename = "#{File.basename(path, '.rb')}.#{mode}.callgrind"
puts "RubyProf outputting to #{filename}"
File.open(filename, '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]
end
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
end
end
if $0 == __FILE__
if (filename = ARGV.shift)
path = File.expand_path(filename)
mode = ARGV.shift
CodeTools::Profiler.new(path, mode).profile_requires
else
STDERR.puts "No file path entered. Usage is tools/profile path/to/file.rb [ruby-prof mode] [ruby-prof printer]"
end
end
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