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require 'optparse'
require 'action_controller/integration'
module ActionController
class RequestProfiler
# Wrap up the integration session runner.
class Sandbox
include Integration::Runner
def self.benchmark(n, script)
new(script).benchmark(n)
end
def initialize(script_path)
@quiet = false
define_run_method(script_path)
reset!
end
def benchmark(n, profiling = false)
@quiet = true
print ' '
result = Benchmark.realtime do
n.times do |i|
run(profiling)
print_progress(i)
end
end
puts
result
ensure
@quiet = false
end
def say(message)
puts " #{message}" unless @quiet
end
private
def define_run_method(script_path)
script = File.read(script_path)
source = <<-end_source
def run(profiling = false)
if profiling
RubyProf.resume do
#{script}
end
else
#{script}
end
old_request_count = request_count
reset!
self.request_count = old_request_count
end
end_source
instance_eval source, script_path, 1
end
def print_progress(i)
print "\n " if i % 60 == 0
print ' ' if i % 10 == 0
print '.'
$stdout.flush
end
end
attr_reader :options
def initialize(options = {})
@options = default_options.merge(options)
end
def self.run(args = nil, options = {})
profiler = new(options)
profiler.parse_options(args) if args
profiler.run
end
def run
sandbox = Sandbox.new(options[:script])
puts 'Warming up once'
elapsed = warmup(sandbox)
puts '%.2f sec, %d requests, %d req/sec' % [elapsed, sandbox.request_count, sandbox.request_count / elapsed]
puts "\n#{options[:benchmark] ? 'Benchmarking' : 'Profiling'} #{options[:n]}x"
options[:benchmark] ? benchmark(sandbox) : profile(sandbox)
end
def profile(sandbox)
load_ruby_prof
benchmark(sandbox, true)
results = RubyProf.stop
show_profile_results results
results
end
def benchmark(sandbox, profiling = false)
sandbox.request_count = 0
elapsed = sandbox.benchmark(options[:n], profiling).to_f
count = sandbox.request_count.to_i
puts '%.2f sec, %d requests, %d req/sec' % [elapsed, count, count / elapsed]
end
def warmup(sandbox)
Benchmark.realtime { sandbox.run(false) }
end
def default_options
{ :n => 100, :open => 'open %s &' }
end
# Parse command-line options
def parse_options(args)
OptionParser.new do |opt|
opt.banner = "USAGE: #{$0} [options] [session script path]"
opt.on('-n', '--times [100]', 'How many requests to process. Defaults to 100.') { |v| options[:n] = v.to_i if v }
opt.on('-b', '--benchmark', 'Benchmark instead of profiling') { |v| options[:benchmark] = v }
opt.on('-m', '--measure [mode]', 'Which ruby-prof measure mode to use: process_time, wall_time, cpu_time, allocations, or memory. Defaults to process_time.') { |v| options[:measure] = v }
opt.on('--open [CMD]', 'Command to open profile results. Defaults to "open %s &"') { |v| options[:open] = v }
opt.on('-h', '--help', 'Show this help') { puts opt; exit }
opt.parse args
if args.empty?
puts opt
exit
end
options[:script] = args.pop
end
end
protected
def load_ruby_prof
begin
gem 'ruby-prof', '>= 0.6.1'
require 'ruby-prof'
if mode = options[:measure]
RubyProf.measure_mode = RubyProf.const_get(mode.upcase)
end
rescue LoadError
abort '`gem install ruby-prof` to use the profiler'
end
end
def show_profile_results(results)
File.open "#{RAILS_ROOT}/tmp/profile-graph.html", 'w' do |file|
RubyProf::GraphHtmlPrinter.new(results).print(file)
`#{options[:open] % file.path}` if options[:open]
end
File.open "#{RAILS_ROOT}/tmp/profile-flat.txt", 'w' do |file|
RubyProf::FlatPrinter.new(results).print(file)
`#{options[:open] % file.path}` if options[:open]
end
end
end
end
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