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bench.rs
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bench.rs
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use criterion::{self, criterion_group, criterion_main, Criterion};
use pretty_assertions::assert_eq;
use quick_xml::events::Event;
use quick_xml::name::QName;
use quick_xml::Reader;
static SAMPLE: &[u8] = include_bytes!("../tests/sample_rss.xml");
static PLAYERS: &[u8] = include_bytes!("../tests/players.xml");
/// Benchmarks the `Reader::read_event` function with all XML well-formless
/// checks disabled (with and without trimming content of #text nodes)
fn read_event(c: &mut Criterion) {
let mut group = c.benchmark_group("read_event");
group.bench_function("trim_text = false", |b| {
b.iter(|| {
let mut r = Reader::from_reader(SAMPLE);
r.check_end_names(false).check_comments(false);
let mut count = criterion::black_box(0);
let mut buf = Vec::new();
loop {
match r.read_event(&mut buf) {
Ok(Event::Start(_)) | Ok(Event::Empty(_)) => count += 1,
Ok(Event::Eof) => break,
_ => (),
}
buf.clear();
}
assert_eq!(count, 1550, "Overall tag count in ./tests/sample_rss.xml");
})
});
group.bench_function("trim_text = true", |b| {
b.iter(|| {
let mut r = Reader::from_reader(SAMPLE);
r.check_end_names(false)
.check_comments(false)
.trim_text(true);
let mut count = criterion::black_box(0);
let mut buf = Vec::new();
loop {
match r.read_event(&mut buf) {
Ok(Event::Start(_)) | Ok(Event::Empty(_)) => count += 1,
Ok(Event::Eof) => break,
_ => (),
}
buf.clear();
}
assert_eq!(count, 1550, "Overall tag count in ./tests/sample_rss.xml");
});
});
group.finish();
}
/// Benchmarks the `Reader::read_namespaced_event` function with all XML well-formless
/// checks disabled (with and without trimming content of #text nodes)
fn read_namespaced_event(c: &mut Criterion) {
let mut group = c.benchmark_group("read_namespaced_event");
group.bench_function("trim_text = false", |b| {
b.iter(|| {
let mut r = Reader::from_reader(SAMPLE);
r.check_end_names(false).check_comments(false);
let mut count = criterion::black_box(0);
let mut buf = Vec::new();
let mut ns_buf = Vec::new();
loop {
match r.read_namespaced_event(&mut buf, &mut ns_buf) {
Ok((_, Event::Start(_))) | Ok((_, Event::Empty(_))) => count += 1,
Ok((_, Event::Eof)) => break,
_ => (),
}
buf.clear();
}
assert_eq!(count, 1550, "Overall tag count in ./tests/sample_rss.xml");
});
});
group.bench_function("trim_text = true", |b| {
b.iter(|| {
let mut r = Reader::from_reader(SAMPLE);
r.check_end_names(false)
.check_comments(false)
.trim_text(true);
let mut count = criterion::black_box(0);
let mut buf = Vec::new();
let mut ns_buf = Vec::new();
loop {
match r.read_namespaced_event(&mut buf, &mut ns_buf) {
Ok((_, Event::Start(_))) | Ok((_, Event::Empty(_))) => count += 1,
Ok((_, Event::Eof)) => break,
_ => (),
}
buf.clear();
}
assert_eq!(count, 1550, "Overall tag count in ./tests/sample_rss.xml");
});
});
group.finish();
}
/// Benchmarks the `BytesText::unescaped()` method (includes time of `read_event`
/// benchmark)
fn bytes_text_unescaped(c: &mut Criterion) {
let mut group = c.benchmark_group("BytesText::unescaped");
group.bench_function("trim_text = false", |b| {
b.iter(|| {
let mut buf = Vec::new();
let mut r = Reader::from_reader(SAMPLE);
r.check_end_names(false).check_comments(false);
let mut count = criterion::black_box(0);
let mut nbtxt = criterion::black_box(0);
loop {
match r.read_event(&mut buf) {
Ok(Event::Start(_)) | Ok(Event::Empty(_)) => count += 1,
Ok(Event::Text(ref e)) => nbtxt += e.unescaped().unwrap().len(),
Ok(Event::Eof) => break,
_ => (),
}
buf.clear();
}
assert_eq!(count, 1550, "Overall tag count in ./tests/sample_rss.xml");
// Windows has \r\n instead of \n
#[cfg(windows)]
assert_eq!(
nbtxt, 67661,
"Overall length (in bytes) of all text contents of ./tests/sample_rss.xml"
);
#[cfg(not(windows))]
assert_eq!(
nbtxt, 66277,
"Overall length (in bytes) of all text contents of ./tests/sample_rss.xml"
);
});
});
group.bench_function("trim_text = true", |b| {
b.iter(|| {
let mut buf = Vec::new();
let mut r = Reader::from_reader(SAMPLE);
r.check_end_names(false)
.check_comments(false)
.trim_text(true);
let mut count = criterion::black_box(0);
let mut nbtxt = criterion::black_box(0);
loop {
match r.read_event(&mut buf) {
Ok(Event::Start(_)) | Ok(Event::Empty(_)) => count += 1,
Ok(Event::Text(ref e)) => nbtxt += e.unescaped().unwrap().len(),
Ok(Event::Eof) => break,
_ => (),
}
buf.clear();
}
assert_eq!(count, 1550, "Overall tag count in ./tests/sample_rss.xml");
// Windows has \r\n instead of \n
#[cfg(windows)]
assert_eq!(
nbtxt, 50334,
"Overall length (in bytes) of all text contents of ./tests/sample_rss.xml"
);
#[cfg(not(windows))]
assert_eq!(
nbtxt, 50261,
"Overall length (in bytes) of all text contents of ./tests/sample_rss.xml"
);
});
});
group.finish();
}
/// Benchmarks, how fast individual event parsed
fn one_event(c: &mut Criterion) {
let mut group = c.benchmark_group("One event");
group.bench_function("StartText", |b| {
let src = "Hello world!".repeat(512 / 12).into_bytes();
let mut buf = Vec::with_capacity(1024);
b.iter(|| {
let mut r = Reader::from_reader(src.as_ref());
let mut nbtxt = criterion::black_box(0);
r.check_end_names(false).check_comments(false);
match r.read_event(&mut buf) {
Ok(Event::StartText(e)) => nbtxt += e.unescaped().unwrap().len(),
something_else => panic!("Did not expect {:?}", something_else),
};
buf.clear();
assert_eq!(nbtxt, 504);
})
});
group.bench_function("Start", |b| {
let src = format!(r#"<hello target="{}">"#, "world".repeat(512 / 5)).into_bytes();
let mut buf = Vec::with_capacity(1024);
b.iter(|| {
let mut r = Reader::from_reader(src.as_ref());
let mut nbtxt = criterion::black_box(0);
r.check_end_names(false)
.check_comments(false)
.trim_text(true);
match r.read_event(&mut buf) {
Ok(Event::Start(ref e)) => nbtxt += e.unescaped().unwrap().len(),
something_else => panic!("Did not expect {:?}", something_else),
};
buf.clear();
assert_eq!(nbtxt, 525);
})
});
group.bench_function("Comment", |b| {
let src = format!(r#"<!-- hello "{}" -->"#, "world".repeat(512 / 5)).into_bytes();
let mut buf = Vec::with_capacity(1024);
b.iter(|| {
let mut r = Reader::from_reader(src.as_ref());
let mut nbtxt = criterion::black_box(0);
r.check_end_names(false)
.check_comments(false)
.trim_text(true);
match r.read_event(&mut buf) {
Ok(Event::Comment(ref e)) => nbtxt += e.unescaped().unwrap().len(),
something_else => panic!("Did not expect {:?}", something_else),
};
buf.clear();
assert_eq!(nbtxt, 520);
})
});
group.bench_function("CData", |b| {
let src = format!(r#"<![CDATA[hello "{}"]]>"#, "world".repeat(512 / 5)).into_bytes();
let mut buf = Vec::with_capacity(1024);
b.iter(|| {
let mut r = Reader::from_reader(src.as_ref());
let mut nbtxt = criterion::black_box(0);
r.check_end_names(false)
.check_comments(false)
.trim_text(true);
match r.read_event(&mut buf) {
Ok(Event::CData(ref e)) => nbtxt += e.len(),
something_else => panic!("Did not expect {:?}", something_else),
};
buf.clear();
assert_eq!(nbtxt, 518);
})
});
group.finish();
}
/// Benchmarks parsing attributes from events
fn attributes(c: &mut Criterion) {
let mut group = c.benchmark_group("attributes");
group.bench_function("with_checks = true", |b| {
b.iter(|| {
let mut r = Reader::from_reader(PLAYERS);
r.check_end_names(false).check_comments(false);
let mut count = criterion::black_box(0);
let mut buf = Vec::new();
loop {
match r.read_event(&mut buf) {
Ok(Event::Empty(e)) => {
for attr in e.attributes() {
let _attr = attr.unwrap();
count += 1
}
}
Ok(Event::Eof) => break,
_ => (),
}
buf.clear();
}
assert_eq!(count, 1041);
})
});
group.bench_function("with_checks = false", |b| {
b.iter(|| {
let mut r = Reader::from_reader(PLAYERS);
r.check_end_names(false).check_comments(false);
let mut count = criterion::black_box(0);
let mut buf = Vec::new();
loop {
match r.read_event(&mut buf) {
Ok(Event::Empty(e)) => {
for attr in e.attributes().with_checks(false) {
let _attr = attr.unwrap();
count += 1
}
}
Ok(Event::Eof) => break,
_ => (),
}
buf.clear();
}
assert_eq!(count, 1041);
})
});
group.bench_function("try_get_attribute", |b| {
b.iter(|| {
let mut r = Reader::from_reader(PLAYERS);
r.check_end_names(false).check_comments(false);
let mut count = criterion::black_box(0);
let mut buf = Vec::new();
loop {
match r.read_event(&mut buf) {
Ok(Event::Empty(e)) if e.name() == QName(b"player") => {
for name in ["num", "status", "avg"] {
if let Some(_attr) = e.try_get_attribute(name).unwrap() {
count += 1
}
}
assert!(e
.try_get_attribute("attribute-that-doesn't-exist")
.unwrap()
.is_none());
}
Ok(Event::Eof) => break,
_ => (),
}
buf.clear();
}
assert_eq!(count, 150);
})
});
group.finish();
}
criterion_group!(
benches,
read_event,
bytes_text_unescaped,
read_namespaced_event,
one_event,
attributes
);
criterion_main!(benches);