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#!/usr/bin/env ruby
# Copyright 2016, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# Histogram class for use in performance testing and measurement
class Histogram
# Determine the bucket index for a given value
# @param {number} value The value to check
# @return {number} The bucket index
def bucket_for(value)
(Math.log(value)/Math.log(@multiplier)).to_i
end
# Initialize an empty histogram
# @param {number} resolution The resolution of the histogram
# @param {number} max_possible The maximum value for the histogram
def initialize(resolution, max_possible)
@resolution=resolution
@max_possible=max_possible
@sum=0
@sum_of_squares=0
@multiplier=1+resolution
@count=0
@min_seen=max_possible
@max_seen=0
@buckets=Array.new(bucket_for(max_possible)+1, 0)
end
# Add a value to the histogram. This updates all statistics with the new
# value. Those statistics should not be modified except with this function
# @param {number} value The value to add
def add(value)
@sum += value
@sum_of_squares += value * value
@count += 1
if value < @min_seen
@min_seen = value
end
if value > @max_seen
@max_seen = value
end
@buckets[bucket_for(value)] += 1
end
def minimum
@min_seen
end
def maximum
@max_seen
end
def sum
@sum
end
def sum_of_squares
@sum_of_squares
end
def count
@count
end
def contents
@buckets
end
end
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