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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
#[macro_use]
extern crate criterion;
use base64::{
display,
engine::{general_purpose::STANDARD, Engine},
write,
};
use criterion::{black_box, Bencher, BenchmarkId, Criterion, Throughput};
use rand::{Rng, SeedableRng};
use std::io::{self, Read, Write};
fn do_decode_bench(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size * 3 / 4);
fill(&mut v);
let encoded = STANDARD.encode(&v);
b.iter(|| {
let orig = STANDARD.decode(&encoded);
black_box(&orig);
});
}
fn do_decode_bench_reuse_buf(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size * 3 / 4);
fill(&mut v);
let encoded = STANDARD.encode(&v);
let mut buf = Vec::new();
b.iter(|| {
STANDARD.decode_vec(&encoded, &mut buf).unwrap();
black_box(&buf);
buf.clear();
});
}
fn do_decode_bench_slice(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size * 3 / 4);
fill(&mut v);
let encoded = STANDARD.encode(&v);
let mut buf = Vec::new();
buf.resize(size, 0);
b.iter(|| {
STANDARD.decode_slice(&encoded, &mut buf).unwrap();
black_box(&buf);
});
}
fn do_decode_bench_stream(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size * 3 / 4);
fill(&mut v);
let encoded = STANDARD.encode(&v);
let mut buf = Vec::new();
buf.resize(size, 0);
buf.truncate(0);
b.iter(|| {
let mut cursor = io::Cursor::new(&encoded[..]);
let mut decoder = base64::read::DecoderReader::new(&mut cursor, &STANDARD);
decoder.read_to_end(&mut buf).unwrap();
buf.clear();
black_box(&buf);
});
}
fn do_encode_bench(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size);
fill(&mut v);
b.iter(|| {
let e = STANDARD.encode(&v);
black_box(&e);
});
}
fn do_encode_bench_display(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size);
fill(&mut v);
b.iter(|| {
let e = format!("{}", display::Base64Display::new(&v, &STANDARD));
black_box(&e);
});
}
fn do_encode_bench_reuse_buf(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size);
fill(&mut v);
let mut buf = String::new();
b.iter(|| {
STANDARD.encode_string(&v, &mut buf);
buf.clear();
});
}
fn do_encode_bench_slice(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size);
fill(&mut v);
let mut buf = Vec::new();
// conservative estimate of encoded size
buf.resize(v.len() * 2, 0);
b.iter(|| STANDARD.encode_slice(&v, &mut buf).unwrap());
}
fn do_encode_bench_stream(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size);
fill(&mut v);
let mut buf = Vec::new();
buf.reserve(size * 2);
b.iter(|| {
buf.clear();
let mut stream_enc = write::EncoderWriter::new(&mut buf, &STANDARD);
stream_enc.write_all(&v).unwrap();
stream_enc.flush().unwrap();
});
}
fn do_encode_bench_string_stream(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size);
fill(&mut v);
b.iter(|| {
let mut stream_enc = write::EncoderStringWriter::new(&STANDARD);
stream_enc.write_all(&v).unwrap();
stream_enc.flush().unwrap();
let _ = stream_enc.into_inner();
});
}
fn do_encode_bench_string_reuse_buf_stream(b: &mut Bencher, &size: &usize) {
let mut v: Vec<u8> = Vec::with_capacity(size);
fill(&mut v);
let mut buf = String::new();
b.iter(|| {
buf.clear();
let mut stream_enc = write::EncoderStringWriter::from_consumer(&mut buf, &STANDARD);
stream_enc.write_all(&v).unwrap();
stream_enc.flush().unwrap();
let _ = stream_enc.into_inner();
});
}
fn fill(v: &mut Vec<u8>) {
let cap = v.capacity();
// weak randomness is plenty; we just want to not be completely friendly to the branch predictor
let mut r = rand::rngs::SmallRng::from_entropy();
while v.len() < cap {
v.push(r.gen::<u8>());
}
}
const BYTE_SIZES: [usize; 5] = [3, 50, 100, 500, 3 * 1024];
// Benchmarks over these byte sizes take longer so we will run fewer samples to
// keep the benchmark runtime reasonable.
const LARGE_BYTE_SIZES: [usize; 3] = [3 * 1024 * 1024, 10 * 1024 * 1024, 30 * 1024 * 1024];
fn encode_benchmarks(c: &mut Criterion, label: &str, byte_sizes: &[usize]) {
let mut group = c.benchmark_group(label);
group
.warm_up_time(std::time::Duration::from_millis(500))
.measurement_time(std::time::Duration::from_secs(3));
for size in byte_sizes {
group
.throughput(Throughput::Bytes(*size as u64))
.bench_with_input(BenchmarkId::new("encode", size), size, do_encode_bench)
.bench_with_input(
BenchmarkId::new("encode_display", size),
size,
do_encode_bench_display,
)
.bench_with_input(
BenchmarkId::new("encode_reuse_buf", size),
size,
do_encode_bench_reuse_buf,
)
.bench_with_input(
BenchmarkId::new("encode_slice", size),
size,
do_encode_bench_slice,
)
.bench_with_input(
BenchmarkId::new("encode_reuse_buf_stream", size),
size,
do_encode_bench_stream,
)
.bench_with_input(
BenchmarkId::new("encode_string_stream", size),
size,
do_encode_bench_string_stream,
)
.bench_with_input(
BenchmarkId::new("encode_string_reuse_buf_stream", size),
size,
do_encode_bench_string_reuse_buf_stream,
);
}
group.finish();
}
fn decode_benchmarks(c: &mut Criterion, label: &str, byte_sizes: &[usize]) {
let mut group = c.benchmark_group(label);
for size in byte_sizes {
group
.warm_up_time(std::time::Duration::from_millis(500))
.measurement_time(std::time::Duration::from_secs(3))
.throughput(Throughput::Bytes(*size as u64))
.bench_with_input(BenchmarkId::new("decode", size), size, do_decode_bench)
.bench_with_input(
BenchmarkId::new("decode_reuse_buf", size),
size,
do_decode_bench_reuse_buf,
)
.bench_with_input(
BenchmarkId::new("decode_slice", size),
size,
do_decode_bench_slice,
)
.bench_with_input(
BenchmarkId::new("decode_stream", size),
size,
do_decode_bench_stream,
);
}
group.finish();
}
fn bench(c: &mut Criterion) {
encode_benchmarks(c, "encode_small_input", &BYTE_SIZES[..]);
encode_benchmarks(c, "encode_large_input", &LARGE_BYTE_SIZES[..]);
decode_benchmarks(c, "decode_small_input", &BYTE_SIZES[..]);
decode_benchmarks(c, "decode_large_input", &LARGE_BYTE_SIZES[..]);
}
criterion_group!(benches, bench);
criterion_main!(benches);
|
