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extern crate base64;
#[macro_use]
extern crate criterion;
extern crate rand;
use base64::display;
use base64::{
decode, decode_config_buf, decode_config_slice, encode, encode_config_buf, encode_config_slice,
write, Config,
};
use criterion::{black_box, Bencher, Criterion, ParameterizedBenchmark, Throughput};
use rand::{FromEntropy, Rng};
use std::io::{self, Read, Write};
const TEST_CONFIG: Config = base64::STANDARD;
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 = encode(&v);
b.iter(|| {
let orig = 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 = encode(&v);
let mut buf = Vec::new();
b.iter(|| {
decode_config_buf(&encoded, TEST_CONFIG, &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 = encode(&v);
let mut buf = Vec::new();
buf.resize(size, 0);
b.iter(|| {
decode_config_slice(&encoded, TEST_CONFIG, &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 = 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, TEST_CONFIG);
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 = 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::with_config(&v, TEST_CONFIG));
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(|| {
encode_config_buf(&v, TEST_CONFIG, &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(|| {
encode_config_slice(&v, TEST_CONFIG, &mut buf);
});
}
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, TEST_CONFIG);
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(TEST_CONFIG);
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(&mut buf, TEST_CONFIG);
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(byte_sizes: &[usize]) -> ParameterizedBenchmark<usize> {
ParameterizedBenchmark::new("encode", do_encode_bench, byte_sizes.iter().cloned())
.warm_up_time(std::time::Duration::from_millis(500))
.measurement_time(std::time::Duration::from_secs(3))
.throughput(|s| Throughput::Bytes(*s as u64))
.with_function("encode_display", do_encode_bench_display)
.with_function("encode_reuse_buf", do_encode_bench_reuse_buf)
.with_function("encode_slice", do_encode_bench_slice)
.with_function("encode_reuse_buf_stream", do_encode_bench_stream)
.with_function("encode_string_stream", do_encode_bench_string_stream)
.with_function(
"encode_string_reuse_buf_stream",
do_encode_bench_string_reuse_buf_stream,
)
}
fn decode_benchmarks(byte_sizes: &[usize]) -> ParameterizedBenchmark<usize> {
ParameterizedBenchmark::new("decode", do_decode_bench, byte_sizes.iter().cloned())
.warm_up_time(std::time::Duration::from_millis(500))
.measurement_time(std::time::Duration::from_secs(3))
.throughput(|s| Throughput::Bytes(*s as u64))
.with_function("decode_reuse_buf", do_decode_bench_reuse_buf)
.with_function("decode_slice", do_decode_bench_slice)
.with_function("decode_stream", do_decode_bench_stream)
}
fn bench(c: &mut Criterion) {
c.bench("bench_small_input", encode_benchmarks(&BYTE_SIZES[..]));
c.bench(
"bench_large_input",
encode_benchmarks(&LARGE_BYTE_SIZES[..]).sample_size(10),
);
c.bench("bench_small_input", decode_benchmarks(&BYTE_SIZES[..]));
c.bench(
"bench_large_input",
decode_benchmarks(&LARGE_BYTE_SIZES[..]).sample_size(10),
);
}
criterion_group!(benches, bench);
criterion_main!(benches);
|
