rust/library/core/benches/fmt.rs at 3f1d2aadd19c3cb71f1d88fb0b0c565808a3c040 · JulianKnodt/rust · GitHub

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
use std::fmt::{self, Write as FmtWrite};
use std::io::{self, Write as IoWrite};
use test::Bencher;

#[bench]
fn write_vec_value(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = Vec::new();
        for _ in 0..1000 {
            mem.write_all("abc".as_bytes()).unwrap();
        }
    });
}

#[bench]
fn write_vec_ref(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = Vec::new();
        let wr = &mut mem as &mut dyn io::Write;
        for _ in 0..1000 {
            wr.write_all("abc".as_bytes()).unwrap();
        }
    });
}

#[bench]
fn write_vec_macro1(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = Vec::new();
        let wr = &mut mem as &mut dyn io::Write;
        for _ in 0..1000 {
            write!(wr, "abc").unwrap();
        }
    });
}

#[bench]
fn write_vec_macro2(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = Vec::new();
        let wr = &mut mem as &mut dyn io::Write;
        for _ in 0..1000 {
            write!(wr, "{}", "abc").unwrap();
        }
    });
}

#[bench]
fn write_vec_macro_debug(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = Vec::new();
        let wr = &mut mem as &mut dyn io::Write;
        for _ in 0..1000 {
            write!(wr, "{:?}", "☃").unwrap();
        }
    });
}

#[bench]
fn write_str_value(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = String::new();
        for _ in 0..1000 {
            mem.write_str("abc").unwrap();
        }
    });
}

#[bench]
fn write_str_ref(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = String::new();
        let wr = &mut mem as &mut dyn fmt::Write;
        for _ in 0..1000 {
            wr.write_str("abc").unwrap();
        }
    });
}

#[bench]
fn write_str_macro1(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = String::new();
        for _ in 0..1000 {
            write!(mem, "abc").unwrap();
        }
    });
}

#[bench]
fn write_str_macro2(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = String::new();
        let wr = &mut mem as &mut dyn fmt::Write;
        for _ in 0..1000 {
            write!(wr, "{}", "abc").unwrap();
        }
    });
}

#[bench]
fn write_str_macro_debug(bh: &mut Bencher) {
    bh.iter(|| {
        let mut mem = String::new();
        let wr = &mut mem as &mut dyn fmt::Write;
        for _ in 0..1000 {
            write!(wr, "{:?}", "☃").unwrap();
        }
    });
}

#[bench]
fn write_u128_max(bh: &mut Bencher) {
    bh.iter(|| {
        std::hint::black_box(format!("{}", u128::MAX));
    });
}

#[bench]
fn write_u128_min(bh: &mut Bencher) {
    bh.iter(|| {
        let s = format!("{}", 0u128);
        std::hint::black_box(s);
    });
}

#[bench]
fn write_u64_max(bh: &mut Bencher) {
    bh.iter(|| {
        std::hint::black_box(format!("{}", u64::MAX));
    });
}

#[bench]
fn write_u64_min(bh: &mut Bencher) {
    bh.iter(|| {
        std::hint::black_box(format!("{}", 0u64));
    });
}