89 lines
2.3 KiB
Ruby
89 lines
2.3 KiB
Ruby
#!/usr/bin/env ruby
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# Copyright 2016 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Histogram class for use in performance testing and measurement
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require 'thread'
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class Histogram
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# Determine the bucket index for a given value
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# @param {number} value The value to check
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# @return {number} The bucket index
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def bucket_for(value)
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(Math.log(value)/Math.log(@multiplier)).to_i
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end
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# Initialize an empty histogram
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# @param {number} resolution The resolution of the histogram
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# @param {number} max_possible The maximum value for the histogram
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def initialize(resolution, max_possible)
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@lock = Mutex.new
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@resolution=resolution
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@max_possible=max_possible
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@sum=0
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@sum_of_squares=0
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@multiplier=1+resolution
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@count=0
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@min_seen=max_possible
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@max_seen=0
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@buckets=Array.new(bucket_for(max_possible)+1, 0)
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end
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# Add a value to the histogram. This updates all statistics with the new
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# value. Those statistics should not be modified except with this function
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# @param {number} value The value to add
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def add(value)
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@sum += value
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@sum_of_squares += value * value
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@count += 1
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if value < @min_seen
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@min_seen = value
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end
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if value > @max_seen
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@max_seen = value
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end
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@buckets[bucket_for(value)] += 1
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end
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def minimum
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@min_seen
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end
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def maximum
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@max_seen
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end
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def sum
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@sum
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end
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def sum_of_squares
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@sum_of_squares
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end
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def count
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@count
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end
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def contents
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@buckets
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end
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def merge(hist)
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@lock.synchronize do
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@min_seen = hist.min_seen
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@max_seen = hist.max_seen
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@sum += hist.sum
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@sum_of_squares += hist.sum_of_squares
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@count += hist.count
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received_bucket = hist.bucket.to_a
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@buckets = @buckets.map.with_index{ |m,i| m + received_bucket[i].to_i }
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end
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end
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end
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