Class: CodeMetrics::Profiler

Inherits:
Object
  • Object
show all
Defined in:
lib/code_metrics/profiler.rb

Constant Summary collapse

Error = 
Class.new(StandardError)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path, mode = nil) ⇒ Profiler

Returns a new instance of Profiler.



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# File 'lib/code_metrics/profiler.rb', line 7

def initialize(path, mode=nil)
  assert_ruby_file_exists(path)
  @path, @mode = path, mode
  Gem.refresh
  # H/T https://github.com/pry/pry/blob/b02d0a4863/lib/pry/plugins.rb#L72
  Gem::Specification.respond_to?(:each) ? Gem::Specification.all : Gem.source_index
  require 'benchmark'
end

Instance Attribute Details

#mode ⇒ Object (readonly)

Returns the value of attribute mode.



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# File 'lib/code_metrics/profiler.rb', line 6

def mode
  @mode
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/code_metrics/profiler.rb', line 6

def path
  @path
end

Instance Method Details

#profile_requires ⇒ Object 



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# File 'lib/code_metrics/profiler.rb', line 16

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
      RubyProf.const_get("#{printer.to_s.classify}Printer").new(results).print($stdout)
    elsif RubyProf.const_defined?(:CallStackPrinter)
      File.open("#{File.basename(path, '.rb')}.#{mode}.html", 'w') do |out|
        RubyProf::CallStackPrinter.new(results).print(out)
      end
    else
      File.open("#{File.basename(path, '.rb')}.#{mode}.callgrind", '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