90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
// Copyright 2024 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 join
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import (
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"runtime"
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"testing"
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"unsafe"
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"github.com/pingcap/tidb/pkg/util"
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)
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func BenchmarkHashTableBuild(b *testing.B) {
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b.StopTimer()
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rowTable, err := createRowTable(3000000)
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if err != nil {
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b.Fatal(err)
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}
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subTable := newSubTable(rowTable)
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segmentCount := len(rowTable.segments)
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b.StartTimer()
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subTable.build(0, segmentCount)
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}
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func BenchmarkHashTableConcurrentBuild(b *testing.B) {
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b.StopTimer()
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rowTable, err := createRowTable(3000000)
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if err != nil {
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b.Fatal(err)
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}
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subTable := newSubTable(rowTable)
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segmentCount := len(rowTable.segments)
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buildThreads := 3
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wg := util.WaitGroupWrapper{}
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b.StartTimer()
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for i := 0; i < buildThreads; i++ {
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segmentStart := segmentCount / buildThreads * i
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segmentEnd := segmentCount / buildThreads * (i + 1)
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if i == buildThreads-1 {
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segmentEnd = segmentCount
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}
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wg.Run(func() {
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subTable.build(segmentStart, segmentEnd)
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})
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}
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wg.Wait()
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}
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func BenchmarkTestUnsafePointer(b *testing.B) {
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size := int(1e3)
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a := make([]byte, size*8)
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p := make([]unsafe.Pointer, size)
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b.StopTimer()
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for i := 0; i < size; i++ {
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p[i] = unsafe.Pointer(&a[i*8])
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}
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for i := 0; i < size; i++ {
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*(*int64)(p[i]) = int64(i)
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}
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runtime.KeepAlive(a)
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runtime.KeepAlive(p)
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}
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func BenchmarkTestUseUintptrAsUnsafePointer(b *testing.B) {
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size := int(1e3)
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a := make([]byte, size*8)
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p := make([]uintptr, size)
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b.StopTimer()
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for i := 0; i < size; i++ {
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*(*unsafe.Pointer)(unsafe.Pointer(&p[i])) = unsafe.Pointer(&a[i*8])
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}
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for i := 0; i < size; i++ {
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*(*int64)((unsafe.Pointer)(&p[i])) = int64(i)
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}
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runtime.KeepAlive(a)
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runtime.KeepAlive(p)
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}
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