Class: Perfer::InputSizeJob

Inherits:
Job
  • Object
show all
Defined in:
lib/perfer/job/input_size_job.rb

Constant Summary collapse

DEFAULT_START = 
1024
DEFAULT_GENERATOR = 
lambda { |n| n * 2 }

Instance Attribute Summary collapse

Attributes inherited from Job

#metadata, #session, #title

Instance Method Summary collapse

Methods inherited from Job

#load_metadata, #minimal_time, #number_of_measurements, #results, #verbose

Constructor Details

#initialize(session, title, &block) ⇒ InputSizeJob

Returns a new instance of InputSizeJob.



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# File 'lib/perfer/job/input_size_job.rb', line 8

def initialize(session, title, &block)
  super(session, title, &block)
  extra = @session.next_job_metadata
  @start = (extra && extra.delete(:start)) || DEFAULT_START
  @generator = (extra && extra.delete(:generator)) || DEFAULT_GENERATOR
  load_metadata
end

Instance Attribute Details

#last_measurement=(value) ⇒ Object (writeonly)

Sets the attribute last_measurement

Parameters:

  • value —

    the value to set the attribute last_measurement to.



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# File 'lib/perfer/job/input_size_job.rb', line 3

def last_measurement=(value)
  @last_measurement = value
end

Instance Method Details

#measure(n) ⇒ Object 



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# File 'lib/perfer/job/input_size_job.rb', line 16

def measure(n)
  GC.start
  @block.call(n)
  @last_measurement
end

#run ⇒ Object 



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# File 'lib/perfer/job/input_size_job.rb', line 22

def run
  super
  n = @start
  # find an appropriate maximal n, acts as warm-up
  loop do
    time = measure(n)[:real]
    break if time > minimal_time
    n = @generator.call(n)
  end

  max = n
  n = @start
  loop do
    result = Result.new(@metadata)
    result[:input_size] = n
    number_of_measurements.times do
      result << measure(n)
    end
    @session.add_result(result)

    break if n == max
    n = @generator.call(n)
  end
end