github.com/dolthub/maphash@v0.1.0/hasher_bench_test.go (about)

     1  // Copyright 2022 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build go1.19
    16  // +build go1.19
    17  
    18  package maphash
    19  
    20  import (
    21  	gohash "hash/maphash"
    22  	"math/rand"
    23  	"testing"
    24  )
    25  
    26  func BenchmarkUint64Hasher(b *testing.B) {
    27  	h := NewHasher[uint64]()
    28  	b.ResetTimer()
    29  	for i := 0; i < b.N; i++ {
    30  		h.Hash(uint64(i))
    31  	}
    32  	b.ReportAllocs()
    33  }
    34  
    35  func BenchmarkCompareStringHasher(b *testing.B) {
    36  	h := NewHasher[string]()
    37  	seed := gohash.MakeSeed()
    38  	const cnt uint64 = 4096
    39  	const mod uint64 = 4096 - 1
    40  	data := genStringData(cnt, 16)
    41  	b.ResetTimer()
    42  
    43  	b.Run("string hasher", func(b *testing.B) {
    44  		for i := 0; i < b.N; i++ {
    45  			h.Hash(data[uint64(i)&mod])
    46  		}
    47  		b.ReportAllocs()
    48  	})
    49  	b.Run("std string hasher", func(b *testing.B) {
    50  		for i := 0; i < b.N; i++ {
    51  			gohash.String(seed, data[uint64(i)&mod])
    52  		}
    53  		b.ReportAllocs()
    54  	})
    55  }
    56  
    57  func BenchmarkStringPairHasher(b *testing.B) {
    58  	type pair struct {
    59  		a, b string
    60  	}
    61  	h := NewHasher[pair]()
    62  	const cnt uint64 = 4096
    63  	const mod uint64 = 4096 - 1
    64  	dataA := genStringData(cnt, 16)
    65  	dataB := genStringData(cnt, 16)
    66  	b.ResetTimer()
    67  	for i := 0; i < b.N; i++ {
    68  		h.Hash(pair{
    69  			a: dataA[uint64(i)&mod],
    70  			b: dataB[uint64(i)&mod],
    71  		})
    72  	}
    73  	b.ReportAllocs()
    74  }
    75  
    76  var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
    77  
    78  func genStringData(cnt, ln uint64) (data []string) {
    79  	str := func(n uint64) string {
    80  		s := make([]rune, n)
    81  		for i := range s {
    82  			s[i] = letters[rand.Intn(52)]
    83  		}
    84  		return string(s)
    85  	}
    86  	data = make([]string, cnt)
    87  	for i := range data {
    88  		data[i] = str(ln)
    89  	}
    90  	return
    91  }