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actix-web/actix-http/benches/status-line.rs
Rob Ede f37cb6dd0b
refactor h1 status line helper to remove unsafe usage (#1484)
Co-authored-by: Yuki Okushi <huyuumi.dev@gmail.com>
2020-05-03 17:37:40 +09:00

222 lines
6.3 KiB
Rust

use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
use bytes::BytesMut;
use http::Version;
const CODES: &[u16] = &[201, 303, 404, 515];
fn bench_write_status_line_11(c: &mut Criterion) {
let mut group = c.benchmark_group("write_status_line v1.1");
let version = Version::HTTP_11;
for i in CODES.iter() {
group.bench_with_input(BenchmarkId::new("Original (unsafe)", i), i, |b, &i| {
b.iter(|| {
let mut b = BytesMut::with_capacity(35);
_original::write_status_line(version, i, &mut b);
})
});
group.bench_with_input(BenchmarkId::new("New (safe)", i), i, |b, &i| {
b.iter(|| {
let mut b = BytesMut::with_capacity(35);
_new::write_status_line(version, i, &mut b);
})
});
group.bench_with_input(BenchmarkId::new("Naive", i), i, |b, &i| {
b.iter(|| {
let mut b = BytesMut::with_capacity(35);
_naive::write_status_line(version, i, &mut b);
})
});
}
group.finish();
}
fn bench_write_status_line_10(c: &mut Criterion) {
let mut group = c.benchmark_group("write_status_line v1.0");
let version = Version::HTTP_10;
for i in CODES.iter() {
group.bench_with_input(BenchmarkId::new("Original (unsafe)", i), i, |b, &i| {
b.iter(|| {
let mut b = BytesMut::with_capacity(35);
_original::write_status_line(version, i, &mut b);
})
});
group.bench_with_input(BenchmarkId::new("New (safe)", i), i, |b, &i| {
b.iter(|| {
let mut b = BytesMut::with_capacity(35);
_new::write_status_line(version, i, &mut b);
})
});
group.bench_with_input(BenchmarkId::new("Naive", i), i, |b, &i| {
b.iter(|| {
let mut b = BytesMut::with_capacity(35);
_naive::write_status_line(version, i, &mut b);
})
});
}
group.finish();
}
fn bench_write_status_line_09(c: &mut Criterion) {
let mut group = c.benchmark_group("write_status_line v0.9");
let version = Version::HTTP_09;
for i in CODES.iter() {
group.bench_with_input(BenchmarkId::new("Original (unsafe)", i), i, |b, &i| {
b.iter(|| {
let mut b = BytesMut::with_capacity(35);
_original::write_status_line(version, i, &mut b);
})
});
group.bench_with_input(BenchmarkId::new("New (safe)", i), i, |b, &i| {
b.iter(|| {
let mut b = BytesMut::with_capacity(35);
_new::write_status_line(version, i, &mut b);
})
});
group.bench_with_input(BenchmarkId::new("Naive", i), i, |b, &i| {
b.iter(|| {
let mut b = BytesMut::with_capacity(35);
_naive::write_status_line(version, i, &mut b);
})
});
}
group.finish();
}
criterion_group!(
benches,
bench_write_status_line_11,
bench_write_status_line_10,
bench_write_status_line_09
);
criterion_main!(benches);
mod _naive {
use bytes::{BufMut, BytesMut};
use http::Version;
pub(crate) fn write_status_line(version: Version, n: u16, bytes: &mut BytesMut) {
match version {
Version::HTTP_11 => bytes.put_slice(b"HTTP/1.1 "),
Version::HTTP_10 => bytes.put_slice(b"HTTP/1.0 "),
Version::HTTP_09 => bytes.put_slice(b"HTTP/0.9 "),
_ => {
// other HTTP version handlers do not use this method
}
}
bytes.put_slice(n.to_string().as_bytes());
}
}
mod _new {
use bytes::{BufMut, BytesMut};
use http::Version;
const DIGITS_START: u8 = b'0';
pub(crate) fn write_status_line(version: Version, n: u16, bytes: &mut BytesMut) {
match version {
Version::HTTP_11 => bytes.put_slice(b"HTTP/1.1 "),
Version::HTTP_10 => bytes.put_slice(b"HTTP/1.0 "),
Version::HTTP_09 => bytes.put_slice(b"HTTP/0.9 "),
_ => {
// other HTTP version handlers do not use this method
}
}
let d100 = (n / 100) as u8;
let d10 = ((n / 10) % 10) as u8;
let d1 = (n % 10) as u8;
bytes.put_u8(DIGITS_START + d100);
bytes.put_u8(DIGITS_START + d10);
bytes.put_u8(DIGITS_START + d1);
bytes.put_u8(b' ');
}
}
mod _original {
use std::ptr;
use bytes::{BufMut, BytesMut};
use http::Version;
const DEC_DIGITS_LUT: &[u8] = b"0001020304050607080910111213141516171819\
2021222324252627282930313233343536373839\
4041424344454647484950515253545556575859\
6061626364656667686970717273747576777879\
8081828384858687888990919293949596979899";
pub(crate) const STATUS_LINE_BUF_SIZE: usize = 13;
pub(crate) fn write_status_line(version: Version, mut n: u16, bytes: &mut BytesMut) {
let mut buf: [u8; STATUS_LINE_BUF_SIZE] = *b"HTTP/1.1 ";
match version {
Version::HTTP_2 => buf[5] = b'2',
Version::HTTP_10 => buf[7] = b'0',
Version::HTTP_09 => {
buf[5] = b'0';
buf[7] = b'9';
}
_ => (),
}
let mut curr: isize = 12;
let buf_ptr = buf.as_mut_ptr();
let lut_ptr = DEC_DIGITS_LUT.as_ptr();
let four = n > 999;
// decode 2 more chars, if > 2 chars
let d1 = (n % 100) << 1;
n /= 100;
curr -= 2;
unsafe {
ptr::copy_nonoverlapping(
lut_ptr.offset(d1 as isize),
buf_ptr.offset(curr),
2,
);
}
// decode last 1 or 2 chars
if n < 10 {
curr -= 1;
unsafe {
*buf_ptr.offset(curr) = (n as u8) + b'0';
}
} else {
let d1 = n << 1;
curr -= 2;
unsafe {
ptr::copy_nonoverlapping(
lut_ptr.offset(d1 as isize),
buf_ptr.offset(curr),
2,
);
}
}
bytes.put_slice(&buf);
if four {
bytes.put_u8(b' ');
}
}
}