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Tool for profiling resource usage in each require call.

$ ruby -Iactiveresource/lib tools/profile_requires.rb active_resource
91.84 KB       3220 obj      4.0 ms  active_resource
83.86 KB       3108 obj      3.3 ms   active_support
69.32 KB       2682 obj      2.6 ms    active_support/vendor
33.98 KB        651 obj      0.6 ms     i18n
94.40 KB        315 obj      4.0 ms  44 KB RSS
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1 parent a747ab5 commit 8ee0c598dbe3f9fd133e85c69c6e43f62056646c @jeremy jeremy committed May 7, 2009
Showing with 75 additions and 0 deletions.
  1. +75 −0 tools/profile_requires.rb
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75 tools/profile_requires.rb
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+#!/usr/bin/env ruby
+# Example:
+# ruby -Iactivesupport/lib tools/profile_requires.rb active_support
+# ruby -Iactionpack/lib tools/profile_requires.rb action_controller
+abort 'Use REE so you can profile memory and object allocation' unless GC.respond_to?(:enable_stats)
+
+GC.enable_stats
+require 'rubygems'
+Gem.source_index
+require 'benchmark'
+
+module TrackHeapGrowth
+ class << self
+ attr_accessor :indent
+ attr_accessor :stats
+ end
+ self.indent = 0
+ self.stats = []
+
+ def track_growth(file)
+ TrackHeapGrowth.indent += 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
+ TrackHeapGrowth.indent -= 1
+ TrackHeapGrowth.stats << [file, TrackHeapGrowth.indent, elapsed, heap_after - heap_before, objects_after - objects_before] if result
+ result
+ end
+
+ def require(file, *args)
+ track_growth(file) { super }
+ end
+
+ def load(file, *args)
+ track_growth(file) { super }
+ end
+end
+
+Object.instance_eval { include TrackHeapGrowth }
+
+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
+end
+
+ENV['NO_RELOAD'] ||= '1'
+ENV['RAILS_ENV'] ||= 'development'
+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("profile_startup.#{mode}.tree", 'w') do |out|
+ RubyProf::CallTreePrinter.new(results).print(out)
+ end
+end
+
+TrackHeapGrowth.stats.reverse_each do |file, indent, sec, bytes, objects|
+ puts "%10.2f KB %10d obj %8.1f ms %s%s" % [bytes / 1024.0, objects, sec * 1000, ' ' * indent, file]
+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]

2 comments on commit 8ee0c59

@mislav
Ruby on Rails member

w00t!

@miloops

nice!

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