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53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
// Copyright 2023 The Prometheus Authors
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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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package histogram
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// GenerateBigTestHistograms generates a slice of histograms with given number of buckets each.
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func GenerateBigTestHistograms(numHistograms, numBuckets int) []*Histogram {
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numSpans := numBuckets / 10
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bucketsPerSide := numBuckets / 2
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spanLength := uint32(bucketsPerSide / numSpans)
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// Given all bucket deltas are 1, sum bucketsPerSide + 1.
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observationCount := bucketsPerSide * (1 + bucketsPerSide)
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var histograms []*Histogram
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for i := 0; i < numHistograms; i++ {
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h := &Histogram{
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Count: uint64(i + observationCount),
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ZeroCount: uint64(i),
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ZeroThreshold: 1e-128,
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Sum: 18.4 * float64(i+1),
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Schema: 2,
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NegativeSpans: make([]Span, numSpans),
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PositiveSpans: make([]Span, numSpans),
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NegativeBuckets: make([]int64, bucketsPerSide),
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PositiveBuckets: make([]int64, bucketsPerSide),
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}
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for j := 0; j < numSpans; j++ {
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s := Span{Offset: 1, Length: spanLength}
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h.NegativeSpans[j] = s
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h.PositiveSpans[j] = s
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}
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for j := 0; j < bucketsPerSide; j++ {
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h.NegativeBuckets[j] = 1
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h.PositiveBuckets[j] = 1
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}
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histograms = append(histograms, h)
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}
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return histograms
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}
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