109 lines
3.1 KiB
Go
109 lines
3.1 KiB
Go
// Copyright 2023 PingCAP, Inc.
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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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package statistics
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import (
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"fmt"
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"math/rand"
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"testing"
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"time"
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"github.com/pingcap/tidb/pkg/parser/mysql"
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"github.com/pingcap/tidb/pkg/types"
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"github.com/pingcap/tidb/pkg/util/codec"
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"github.com/pingcap/tidb/pkg/util/mock"
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"github.com/stretchr/testify/require"
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)
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const (
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histogramLen = 100
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popedTopNLen = 100
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expBucketNumber = 100
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)
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func genBucket4TestData(length int) []*bucket4Test {
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result := make([]*bucket4Test, 0, length)
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var lower, upper int64
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for n := range length {
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if n == 0 {
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lower = 0
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} else {
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lower = upper + 1
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}
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if n == length-1 {
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upper = 10000
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} else {
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upper = lower + (rand.Int63n(int64(100*(n+1)) - lower))
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}
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result = append(result, &bucket4Test{
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lower: lower,
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upper: upper,
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count: rand.Int63n(10000),
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repeat: rand.Int63n(100),
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ndv: rand.Int63n(100),
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})
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}
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return result
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}
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func genHist4Bench(t *testing.B, buckets []*bucket4Test, totColSize int64) *Histogram {
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h := NewHistogram(0, 0, 0, 0, types.NewFieldType(mysql.TypeBlob), len(buckets), totColSize)
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for _, bucket := range buckets {
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lower, err := codec.EncodeKey(time.UTC, nil, types.NewIntDatum(bucket.lower))
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require.NoError(t, err)
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upper, err := codec.EncodeKey(time.UTC, nil, types.NewIntDatum(bucket.upper))
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require.NoError(t, err)
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di, du := types.NewBytesDatum(lower), types.NewBytesDatum(upper)
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h.AppendBucketWithNDV(&di, &du, bucket.count, bucket.repeat, bucket.ndv)
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}
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return h
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}
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func benchmarkMergePartitionHist2GlobalHist(b *testing.B, partition int) {
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ctx := mock.NewContext()
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sc := ctx.GetSessionVars().StmtCtx
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hists := make([]*Histogram, 0, partition)
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for range partition {
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buckets := genBucket4TestData(histogramLen)
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hist := genHist4Bench(b, buckets, histogramLen)
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hists = append(hists, hist)
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}
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poped := make([]TopNMeta, 0, popedTopNLen)
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for range popedTopNLen {
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b, _ := codec.EncodeKey(sc.TimeZone(), nil, types.NewIntDatum(rand.Int63n(10000)))
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tmp := TopNMeta{
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Encoded: b,
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Count: uint64(rand.Int63n(10000)),
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}
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poped = append(poped, tmp)
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}
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b.StartTimer()
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MergePartitionHist2GlobalHist(sc, hists, poped, expBucketNumber, true, Version2)
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b.StopTimer()
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}
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var benchmarkPartitionSize = []int{1000, 10000, 100000}
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// cmd: go test -run=^$ -bench=BenchmarkMergePartitionHist2GlobalHist -benchmem github.com/pingcap/tidb/pkg/statistics
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func BenchmarkMergePartitionHist2GlobalHist(b *testing.B) {
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for _, size := range benchmarkPartitionSize {
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b.Run(fmt.Sprintf("Size%d", size), func(b *testing.B) {
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for i := 0; i < b.N; i++ {
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benchmarkMergePartitionHist2GlobalHist(b, size)
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}
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})
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}
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}
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