Class: Vernier::Output::Top

Inherits:
Object
  • Object
show all
Defined in:
lib/vernier/output/top.rb

Defined Under Namespace

Classes: Table

Instance Method Summary collapse

Constructor Details

#initialize(profile, row_limit) ⇒ Top

Returns a new instance of Top.



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# File 'lib/vernier/output/top.rb', line 6

def initialize(profile, row_limit)
  @profile = profile
  @row_limit = row_limit
end

Instance Method Details

#output ⇒ Object 



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# File 'lib/vernier/output/top.rb', line 51

def output
  thread = @profile.main_thread
  stack_table =
    if thread.respond_to?(:stack_table)
      thread.stack_table
    else
      @profile._stack_table
    end

  stack_weights = Hash.new(0)
  thread[:samples].zip(thread[:weights]) do |stack_idx, weight|
    stack_weights[stack_idx] += weight
  end

  total = stack_weights.values.sum

  top_by_self = Hash.new(0)
  stack_weights.each do |stack_idx, weight|
    frame_idx = stack_table.stack_frame_idx(stack_idx)
    func_idx = stack_table.frame_func_idx(frame_idx)
    name = stack_table.func_name(func_idx)
    top_by_self[name] += weight
  end

  Table.new %w[Samples % name], @row_limit do |t|
    top_by_self.sort_by(&:last).reverse.each do |frame, samples|
      pct = 100.0 * samples / total
      t << [samples.to_s, pct.round(1).to_s, frame]
    end
  end.to_s
end