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b57f5b59b3
Initial implementation of https://github.com/prometheus/prometheus/issues/17790. Only implements ST-per-sample for Counters. Tests and benchmarks updated. Note: This increases the size of the RefSample object for all users, whether st-per-sample is turned on or not. Signed-off-by: Owen Williams <owen.williams@grafana.com>
97 lines
2.8 KiB
Go
97 lines
2.8 KiB
Go
// Copyright 2025 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 testrecord
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import (
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"math"
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"testing"
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"github.com/prometheus/prometheus/tsdb/chunks"
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"github.com/prometheus/prometheus/tsdb/record"
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)
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type RefSamplesCase string
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const (
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Realistic1000Samples RefSamplesCase = "real1000"
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Realistic1000WithVariableSTSamples RefSamplesCase = "real1000-vst"
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Realistic1000WithConstSTSamples RefSamplesCase = "real1000-cst"
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WorstCase1000 RefSamplesCase = "worst1000"
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WorstCase1000WithSTSamples RefSamplesCase = "worst1000-st"
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)
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func GenTestRefSamplesCase(t testing.TB, c RefSamplesCase) []record.RefSample {
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t.Helper()
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ret := make([]record.RefSample, 1e3)
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switch c {
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// Samples are across series, so likely all have the same timestamp.
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case Realistic1000Samples:
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for i := range ret {
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ret[i].Ref = chunks.HeadSeriesRef(i)
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ret[i].T = int64(12423423)
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ret[i].V = highVarianceFloat(i)
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}
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// Likely the start times will all be the same with deltas.
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case Realistic1000WithConstSTSamples:
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for i := range ret {
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ret[i].Ref = chunks.HeadSeriesRef(i)
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ret[i].ST = int64(12423423)
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ret[i].T = int64(12423423 + 15)
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ret[i].V = highVarianceFloat(i)
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}
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// Maybe series have different start times though
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case Realistic1000WithVariableSTSamples:
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for i := range ret {
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ret[i].Ref = chunks.HeadSeriesRef(i)
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ret[i].ST = int64((12423423 / 9) * (i % 10))
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ret[i].T = int64(12423423)
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ret[i].V = highVarianceFloat(i)
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}
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case WorstCase1000:
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for i := range ret {
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ret[i].Ref = chunks.HeadSeriesRef(i)
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ret[i].T = highVarianceInt(i)
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ret[i].V = highVarianceFloat(i)
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}
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case WorstCase1000WithSTSamples:
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for i := range ret {
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ret[i].Ref = chunks.HeadSeriesRef(i)
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// Worst case is when the values are significantly different
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// to each other which breaks delta encoding.
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ret[i].ST = highVarianceInt(i+1) / 1024 // Make sure ST is not comparable to T
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ret[i].T = highVarianceInt(i)
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ret[i].V = highVarianceFloat(i)
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}
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default:
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t.Fatal("unknown case", c)
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}
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return ret
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}
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func highVarianceInt(i int) int64 {
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if i%2 == 0 {
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return math.MinInt32
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}
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return math.MaxInt32
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}
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func highVarianceFloat(i int) float64 {
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if i%2 == 0 {
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return math.SmallestNonzeroFloat32
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}
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return math.MaxFloat32
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}
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