1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
// Copyright 2017 The Cockroach Authors.
//
// 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 apd
import (
"bytes"
"fmt"
"math/rand"
"testing"
)
// runBenches benchmarks a given function on random decimals on combinations of
// three parameters:
//
// precision: desired output precision
// inScale: the scale of the input decimal: the absolute value will be between
// 10^inScale and 10^(inScale+1)
// inNumDigits: number of digits in the input decimal; if negative the number
// will be negative and the number of digits are the absolute value.
func runBenches(
b *testing.B, precision, inScale, inNumDigits []int, fn func(*testing.B, *Context, *Decimal),
) {
for _, p := range precision {
ctx := BaseContext.WithPrecision(uint32(p))
for _, s := range inScale {
for _, d := range inNumDigits {
numDigits := d
negative := false
if d < 0 {
numDigits = -d
negative = true
}
if numDigits > p {
// Skip cases where we have more digits than the desired precision.
continue
}
// Generate some random numbers with the given number of digits.
nums := make([]Decimal, 20)
for i := range nums {
var buf bytes.Buffer
if negative {
buf.WriteByte('-')
}
buf.WriteByte('1' + byte(rand.Intn(9)))
for j := 1; j < numDigits; j++ {
buf.WriteByte('0' + byte(rand.Intn(10)))
}
if _, _, err := nums[i].SetString(buf.String()); err != nil {
b.Fatal(err)
}
nums[i].Exponent = int32(s - numDigits)
}
b.Run(
fmt.Sprintf("P%d/S%d/D%d", p, s, d),
func(b *testing.B) {
for i := 0; i <= b.N; i++ {
fn(b, ctx, &nums[i%len(nums)])
}
},
)
}
}
}
}
func BenchmarkExp(b *testing.B) {
precision := []int{5, 10, 100}
scale := []int{-4, -1, 2}
digits := []int{-100, -10, -2, 2, 10, 100}
runBenches(
b, precision, scale, digits,
func(b *testing.B, ctx *Context, x *Decimal) {
if _, err := ctx.Exp(&Decimal{}, x); err != nil {
b.Fatal(err)
}
},
)
}
func BenchmarkLn(b *testing.B) {
precision := []int{2, 10, 100}
scale := []int{-100, -10, -2, 2, 10, 100}
digits := []int{2, 10, 100}
runBenches(
b, precision, scale, digits,
func(b *testing.B, ctx *Context, x *Decimal) {
if _, err := ctx.Ln(&Decimal{}, x); err != nil {
b.Fatal(err)
}
},
)
}
func BenchmarkDecimalString(b *testing.B) {
rng := rand.New(rand.NewSource(461210934723948))
corpus := func() []Decimal {
res := make([]Decimal, 8192)
for i := range res {
_, err := res[i].SetFloat64(rng.Float64())
if err != nil {
b.Fatal(err)
}
}
return res
}()
b.ResetTimer()
b.ReportAllocs()
for i := 0; i < b.N; i++ {
_ = corpus[rng.Intn(len(corpus))].String()
}
}
func BenchmarkDecimalSetFloat(b *testing.B) {
rng := rand.New(rand.NewSource(461210934723948))
corpus := func() []float64 {
res := make([]float64, 8192)
for i := range res {
res[i] = rng.ExpFloat64()
}
return res
}()
b.ResetTimer()
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var d Decimal
_, err := d.SetFloat64(corpus[rng.Intn(len(corpus))])
if err != nil {
b.Fatal(err)
}
}
}
|
