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// `cargo test --benches` and `#[feature(test)]` work only in nightly
#![cfg(rustc_nightly)]
#![feature(test)]
extern crate protobuf;
extern crate test;
use std::io;
use std::io::Read;
use protobuf::CodedInputStream;
use self::test::Bencher;
fn make_bytes(len: usize) -> Vec<u8> {
let mut r = Vec::with_capacity(len);
for i in 0..len {
r.push((i % 10) as u8);
}
test::black_box(r)
}
#[bench]
fn read_byte(b: &mut Bencher) {
let v = make_bytes(1_000);
b.iter(|| {
let mut is = CodedInputStream::from_bytes(test::black_box(&v));
while !is.eof().expect("eof") {
test::black_box(is.read_raw_byte().expect("read"));
}
});
}
#[bench]
fn read_byte_no_eof(b: &mut Bencher) {
let v = make_bytes(1_000);
b.iter(|| {
let mut is = CodedInputStream::from_bytes(test::black_box(&v));
for _ in 0..v.len() {
test::black_box(is.read_raw_byte().expect("read"));
}
assert!(is.eof().expect("eof"));
});
}
#[bench]
fn read_byte_from_vec(b: &mut Bencher) {
let v = make_bytes(1_000);
b.iter(|| {
let mut v = io::Cursor::new(test::black_box(&v));
loop {
let mut buf = [0];
let count = v.read(&mut buf).expect("read");
if count == 0 {
break;
}
test::black_box(buf);
}
});
}
#[bench]
fn read_varint_12(b: &mut Bencher) {
let mut v = Vec::new();
{
let mut v = protobuf::CodedOutputStream::vec(&mut v);
for i in 0..1000 {
// one or two byte varints
v.write_raw_varint32((i * 7919) % (1 << 14)).expect("write");
}
v.flush().expect("flush");
}
b.iter(|| {
let mut is = CodedInputStream::from_bytes(test::black_box(&v));
let mut count = 0;
while !is.eof().expect("eof") {
test::black_box(is.read_raw_varint32().expect("read"));
count += 1;
}
assert_eq!(1000, count);
})
}
#[bench]
fn read_varint_1(b: &mut Bencher) {
let mut v = Vec::new();
{
let mut v = protobuf::CodedOutputStream::vec(&mut v);
for i in 0..1000 {
// one or two byte varints
v.write_raw_varint32((i * 7919) % (1 << 7)).expect("write");
}
v.flush().expect("flush");
}
b.iter(|| {
let mut is = CodedInputStream::from_bytes(test::black_box(&v));
let mut count = 0;
while !is.eof().expect("eof") {
test::black_box(is.read_raw_varint32().expect("read"));
count += 1;
}
assert_eq!(1000, count);
})
}
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