aboutsummaryrefslogtreecommitdiffstats
path: root/tools/profile_requires
blob: 927467bc4ec9a265fdd696280a02b37b63ce0f1b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
#!/usr/bin/env ruby
# Example:
#   tools/profile_requires activesupport/lib/active_support.rb
#   tools/profile_requires activeresource/examples/simple.rb
abort 'Use REE so you can profile memory and object allocation' unless GC.respond_to?(:enable_stats)

ENV['NO_RELOAD'] ||= '1'
ENV['RAILS_ENV'] ||= 'development'

GC.enable_stats
require 'rubygems'
Gem.source_index
require 'benchmark'

module RequireProfiler
  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
      heap_before, objects_before = GC.allocated_size, ObjectSpace.allocated_objects
      result = nil
      elapsed = Benchmark.realtime { result = yield }
      heap_after, objects_after = GC.allocated_size, ObjectSpace.allocated_objects
      self.depth -= 1
      stats.pop if stats.last.first == file
      stats << [file, depth, elapsed, heap_after - heap_before, objects_after - objects_before] if result
      result
    end
  end
end

GC.start
before = GC.allocated_size
before_rss = `ps -o rss= -p #{Process.pid}`.to_i
before_live_objects = ObjectSpace.live_objects

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_live_objects = ObjectSpace.live_objects
after_rss = `ps -o rss= -p #{Process.pid}`.to_i
after = GC.allocated_size
usage = (after - before) / 1024.0

if mode
  File.open("#{File.basename(path, '.rb')}.#{mode}.callgrind", 'w') do |out|
    RubyProf::CallTreePrinter.new(results).print(out)
  end
end

RequireProfiler.stats.each do |file, depth, sec, bytes, objects|
  if sec
    puts "%10.2f KB %10d obj %8.1f ms  %s%s" % [bytes / 1024.0, objects, sec * 1000, ' ' * depth, file]
  else
    puts "#{' ' * (42 + depth)}#{file}"
  end
end
puts "%10.2f KB %10d obj %8.1f ms  %d KB RSS" % [usage, after_live_objects - before_live_objects, elapsed * 1000, after_rss - before_rss]