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|
#![allow(unknown_lints)]
use criterion::{criterion_group, criterion_main, Criterion, BatchSize, Throughput, ParameterizedBenchmark};
use rand::prelude::*;
const SIZES: &[usize] = &[3, 16, 64, 256, 1024];
fn rand_enc_input(sz: usize) -> (Vec<u8>, base16::EncConfig) {
let mut rng = thread_rng();
let mut vec = vec![0u8; sz];
let cfg = if rng.gen::<bool>() {
base16::EncodeUpper
} else {
base16::EncodeLower
};
rng.fill_bytes(&mut vec);
(vec, cfg)
}
fn batch_size_for_input(i: usize) -> BatchSize {
if i < 1024 {
BatchSize::SmallInput
} else {
BatchSize::LargeInput
}
}
fn bench_encode(c: &mut Criterion) {
c.bench(
"encode to fresh string",
ParameterizedBenchmark::new(
"encode_config",
|b, items| {
b.iter_batched(
|| rand_enc_input(*items),
|(input, enc)| base16::encode_config(&input, enc),
batch_size_for_input(*items),
)
},
SIZES.iter().cloned(),
).throughput(|bytes| Throughput::Bytes(*bytes as u32)),
);
c.bench(
"encode to preallocated string",
ParameterizedBenchmark::new(
"encode_config_buf",
|b, items| {
b.iter_batched(
|| (rand_enc_input(*items), String::with_capacity(2 * *items)),
|((input, enc), mut buf)| {
buf.truncate(0);
base16::encode_config_buf(&input, enc, &mut buf)
},
batch_size_for_input(*items),
)
},
SIZES.iter().cloned(),
).throughput(|bytes| Throughput::Bytes(*bytes as u32)),
);
c.bench(
"encode to slice",
ParameterizedBenchmark::new(
"encode_config_slice",
|b, items| {
b.iter_batched(
|| (rand_enc_input(*items), vec![0u8; 2 * *items]),
|((input, enc), mut dst)| {
base16::encode_config_slice(&input, enc, &mut dst)
},
batch_size_for_input(*items),
)
},
SIZES.iter().cloned(),
).throughput(|bytes| Throughput::Bytes(*bytes as u32)),
);
}
fn rand_hex_string(size: usize) -> String {
let mut rng = thread_rng();
let mut s = String::with_capacity(size);
let chars: &[u8] = b"0123456789abcdefABCDEF";
while s.len() < size {
s.push(*chars.choose(&mut rng).unwrap() as char);
}
s
}
fn bench_decode(c: &mut Criterion) {
c.bench(
"decode to fresh vec",
ParameterizedBenchmark::new(
"decode",
|b, items| {
b.iter_batched(
|| rand_hex_string(*items),
|input| base16::decode(&input),
batch_size_for_input(*items),
)
},
SIZES.iter().cloned(),
).throughput(|bytes| Throughput::Bytes(*bytes as u32 * 2)),
);
c.bench(
"decode to preallocated vec",
ParameterizedBenchmark::new(
"decode_buf",
|b, items| {
b.iter_batched(
|| (rand_hex_string(*items), Vec::with_capacity(*items)),
|(input, mut buf)| {
buf.truncate(0);
base16::decode_buf(&input, &mut buf)
},
batch_size_for_input(*items),
)
},
SIZES.iter().cloned(),
).throughput(|bytes| Throughput::Bytes(*bytes as u32 * 2)),
);
c.bench(
"decode to slice",
ParameterizedBenchmark::new(
"decode_slice",
|b, items| {
b.iter_batched(
|| (rand_hex_string(*items), vec![0u8; *items]),
|(input, mut buf)| {
base16::decode_slice(&input, &mut buf)
},
batch_size_for_input(*items),
)
},
SIZES.iter().cloned(),
).throughput(|bytes| Throughput::Bytes(*bytes as u32 * 2)),
);
}
criterion_group!(benches, bench_encode, bench_decode);
criterion_main!(benches);
|
