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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
use std::iter::repeat;
use test::{Bencher, black_box};
#[bench]
fn bench_with_capacity(b: &mut Bencher) {
b.iter(|| String::with_capacity(100));
}
#[bench]
fn bench_push_str(b: &mut Bencher) {
let s = "ศไทย中华Việt Nam; Mary had a little lamb, Little lamb";
b.iter(|| {
let mut r = String::new();
r.push_str(s);
});
}
const REPETITIONS: u64 = 10_000;
#[bench]
fn bench_push_str_one_byte(b: &mut Bencher) {
b.bytes = REPETITIONS;
b.iter(|| {
let mut r = String::new();
for _ in 0..REPETITIONS {
r.push_str("a")
}
});
}
#[bench]
fn bench_push_char_one_byte(b: &mut Bencher) {
b.bytes = REPETITIONS;
b.iter(|| {
let mut r = String::new();
for _ in 0..REPETITIONS {
r.push('a')
}
});
}
#[bench]
fn bench_push_char_two_bytes(b: &mut Bencher) {
b.bytes = REPETITIONS * 2;
b.iter(|| {
let mut r = String::new();
for _ in 0..REPETITIONS {
r.push('â')
}
});
}
#[bench]
fn from_utf8_lossy_100_ascii(b: &mut Bencher) {
let s = b"Hello there, the quick brown fox jumped over the lazy dog! \
Lorem ipsum dolor sit amet, consectetur. ";
assert_eq!(100, s.len());
b.iter(|| {
let _ = String::from_utf8_lossy(s);
});
}
#[bench]
fn from_utf8_lossy_100_multibyte(b: &mut Bencher) {
let s = "𐌀𐌖𐌋𐌄𐌑𐌉ปรدولة الكويتทศไทย中华𐍅𐌿𐌻𐍆𐌹𐌻𐌰".as_bytes();
assert_eq!(100, s.len());
b.iter(|| {
let _ = String::from_utf8_lossy(s);
});
}
#[bench]
fn from_utf8_lossy_invalid(b: &mut Bencher) {
let s = b"Hello\xC0\x80 There\xE6\x83 Goodbye";
b.iter(|| {
let _ = String::from_utf8_lossy(s);
});
}
#[bench]
fn from_utf8_lossy_100_invalid(b: &mut Bencher) {
let s = repeat(0xf5).take(100).collect::<Vec<_>>();
b.iter(|| {
let _ = String::from_utf8_lossy(&s);
});
}
#[bench]
fn bench_exact_size_shrink_to_fit(b: &mut Bencher) {
let s = "Hello there, the quick brown fox jumped over the lazy dog! \
Lorem ipsum dolor sit amet, consectetur. ";
// ensure our operation produces an exact-size string before we benchmark it
let mut r = String::with_capacity(s.len());
r.push_str(s);
assert_eq!(r.len(), r.capacity());
b.iter(|| {
let mut r = String::with_capacity(s.len());
r.push_str(s);
r.shrink_to_fit();
r
});
}
#[bench]
fn bench_from_str(b: &mut Bencher) {
let s = "Hello there, the quick brown fox jumped over the lazy dog! \
Lorem ipsum dolor sit amet, consectetur. ";
b.iter(|| String::from(s))
}
#[bench]
fn bench_from(b: &mut Bencher) {
let s = "Hello there, the quick brown fox jumped over the lazy dog! \
Lorem ipsum dolor sit amet, consectetur. ";
b.iter(|| String::from(s))
}
#[bench]
fn bench_to_string(b: &mut Bencher) {
let s = "Hello there, the quick brown fox jumped over the lazy dog! \
Lorem ipsum dolor sit amet, consectetur. ";
b.iter(|| s.to_string())
}
#[bench]
fn bench_insert_char_short(b: &mut Bencher) {
let s = "Hello, World!";
b.iter(|| {
let mut x = String::from(s);
black_box(&mut x).insert(6, black_box(' '));
x
})
}
#[bench]
fn bench_insert_char_long(b: &mut Bencher) {
let s = "Hello, World!";
b.iter(|| {
let mut x = String::from(s);
black_box(&mut x).insert(6, black_box('❤'));
x
})
}
#[bench]
fn bench_insert_str_short(b: &mut Bencher) {
let s = "Hello, World!";
b.iter(|| {
let mut x = String::from(s);
black_box(&mut x).insert_str(6, black_box(" "));
x
})
}
#[bench]
fn bench_insert_str_long(b: &mut Bencher) {
let s = "Hello, World!";
b.iter(|| {
let mut x = String::from(s);
black_box(&mut x).insert_str(6, black_box(" rustic "));
x
})
}
|
