Class: Benchmark::Bencher

Inherits:
Object
  • Object
show all
Defined in:
lib/better-benchmark/bencher.rb

Constant Summary collapse

DATA_FILE = 
'bbench-run-time'

Instance Method Summary collapse

Constructor Details

#initialize(argv) ⇒ Bencher

Returns a new instance of Bencher.

Parameters:

  • argv (Array) —

    The command line arguments passed to the bencher script



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# File 'lib/better-benchmark/bencher.rb', line 11

def initialize( argv )
  @iterations = 10
  @executable = 'ruby'

  while argv.any?
    arg = argv.shift
    case arg
    when '-d'
      @data_dir = argv.shift
      begin
        if ! File.stat( @data_dir ).directory?
          $stderr.puts "#{@data_dir} is not a directory."
          exit 3
        end
      rescue Errno::ENOENT
        $stderr.puts "#{@data_dir} does not exist."
        exit 4
      end
    when '-e'
      @executable = argv.shift
    when '-i'
      @iterations = argv.shift.to_i
    when '-p'
      @max_p = argv.shift
    when '-r'
      if @r1.nil?
        @r1 = argv.shift
      else
        @r2 = argv.shift
      end
    when '-w'
      @test_working_copy = true
    when '--'
      @executable_args = argv.dup
      argv.clear
    end
  end

  if ( ! @test_working_copy && ( @r1.nil? || @r2.nil? ) ) || @executable_args.nil?
    print_usage
    exit 2
  end
end

Instance Method Details

#one_run ⇒ Object 



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# File 'lib/better-benchmark/bencher.rb', line 55

def one_run
  system "#{@executable} #{ @executable_args.join(' ') }"  or exit $?.to_i
end

#print_usage ⇒ Object 



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# File 'lib/better-benchmark/bencher.rb', line 5

def print_usage
  puts "#{$0} [-i <iterations>] [-w] [-r <revision 1> -r <revision 2>] [-p <max p-value>] [-d <data tmp dir>] [-e <executable/interpreter>] -- <executable's args...>"
end

#run ⇒ Object 



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# File 'lib/better-benchmark/bencher.rb', line 70

def run
  times1 = []
  times2 = []

  @iterations.times do
    if @test_working_copy
      system "git stash -q"  or exit $?.to_i
    else
      system "git checkout -q #{@r1}"  or exit $?.to_i
    end
    times1 << time_one_run

    if @test_working_copy
      system "git stash pop -q"  or exit $?.to_i
    else
      system "git checkout -q #{@r2}"  or exit $?.to_i
    end
    times2 << time_one_run
  end

  ::Benchmark.report_on(
    ::Benchmark.compare_times( times1, times2, @max_p )
  )
end

#time_one_run ⇒ Object 



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# File 'lib/better-benchmark/bencher.rb', line 59

def time_one_run
  if @data_dir
    one_run
    File.read( "#{@data_dir}/#{DATA_FILE}" ).to_f
  else
    t0 = Time.now
    one_run
    Time.now.to_f - t0.to_f
  end
end