iterator_test.go

// Copyright 2021 The Bitalosdb author(hustxrb@163.com) and other contributors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package bitalosdb

import (
	"testing"
	"time"

	"golang.org/x/exp/rand"
)

func BenchmarkIteratorSeekGE(b *testing.B) {
	m, keys := buildMemTable(b)
	iter := &Iterator{
		cmp:   DefaultComparer.Compare,
		equal: DefaultComparer.Equal,
		iter:  m.newIter(nil),
	}
	rng := rand.New(rand.NewSource(uint64(time.Now().UnixNano())))

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		key := keys[rng.Intn(len(keys))]
		iter.SeekGE(key)
	}
}

func BenchmarkIteratorNext(b *testing.B) {
	m, _ := buildMemTable(b)
	iter := &Iterator{
		cmp:   DefaultComparer.Compare,
		equal: DefaultComparer.Equal,
		iter:  m.newIter(nil),
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		if !iter.Valid() {
			iter.First()
		}
		iter.Next()
	}
}

func BenchmarkIteratorPrev(b *testing.B) {
	m, _ := buildMemTable(b)
	iter := &Iterator{
		cmp:   DefaultComparer.Compare,
		equal: DefaultComparer.Equal,
		iter:  m.newIter(nil),
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		if !iter.Valid() {
			iter.Last()
		}
		iter.Prev()
	}
}