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bench string reading

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This commit is contained in:
Robin Appelman 2019-03-07 19:58:11 +01:00
commit be50e68461
1 changed files with 53 additions and 1 deletions
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54
benches/bench.rs
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@ -62,6 +62,8 @@ fn perf_f32(b: &mut Bencher) {
});
}
const F64_RESULT: f64 = 0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010156250477904244;
#[bench]
fn perf_f64(b: &mut Bencher) {
let data = vec![1u8; 1024 * 1024 * 10];
@ -78,7 +80,57 @@ fn perf_f64(b: &mut Bencher) {
result += num;
pos += 64;
}
assert_eq!(result, 0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010156250477904244);
assert_eq!(result, F64_RESULT);
test::black_box(result);
});
}
fn build_string_data(size: usize, inputs: &Vec<&str>) -> Vec<u8> {
let mut data = Vec::with_capacity(size);
loop {
for input in inputs.iter() {
if data.len() + input.len() + 1 >= size {
return data;
}
data.extend_from_slice(input.as_bytes());
data.push(0);
}
}
}
fn verify_buffer(buffer: &BitBuffer<BigEndian>, inputs: &Vec<&str>) {
let mut pos = 0;
let len = buffer.bit_len();
loop {
for input in inputs.iter() {
if pos + input.len() + 1 >= len {
return;
}
let result = buffer.read_string(pos, None).unwrap();
pos += (result.len() + 1) * 8;
assert_eq!(*input, result.as_str());
}
}
}
#[bench]
fn perf_string(b: &mut Bencher) {
let inputs = vec!["foo", "bar", "something a little bit longer for extra testing", "a", ""];
let data = build_string_data(10 * 1024 * 1024, &inputs);
let buffer = BitBuffer::new(data, BigEndian);
// test it once before bench
//verify_buffer(&buffer, &inputs);
b.iter(|| {
let mut pos = 0;
let len = buffer.bit_len();
loop {
if pos + (128 * 8) > len {
break;
}
let result = buffer.read_string(pos, None).unwrap();
pos += (result.len() + 1) * 8;
test::black_box(result);
}
});
}