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#!/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)
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.stats << [file, TrackHeapGrowth.indent]
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.pop if TrackHeapGrowth.stats.last.first == file
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.each do |file, indent, sec, bytes, objects|
if sec
puts "%10.2f KB %10d obj %8.1f ms %s%s" % [bytes / 1024.0, objects, sec * 1000, ' ' * indent, file]
else
puts "#{' ' * (42 + indent)}#{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]
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