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tamer: bench: xir: Reduce writer benchmark memory usage 

These were using GiB of memory, which is ...unnecessary.

I reduced the iteration count significantly, but it was still wasting a lot
of time and memory and needed `with_capacity` to reduce the number of copies
after reallocation.

It is not typical that a buffer would contain this much information.
main
Mike Gerwitz 2021-09-21 16:21:32 -04:00
parent aee781a6fb
commit e0a209d417
1 changed files with 6 additions and 6 deletions
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12
tamer/benches/xir.rs
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@ -229,14 +229,14 @@ This is pretend fragment text. We need a lot of it.</fragment>
// The other major thing we do is output large amounts of text (the
// linked fragments).
#[bench]
fn baseline_quick_xml_text_500(bench: &mut Bencher) {
let buf = Vec::<u8>::new();
fn baseline_quick_xml_text_50(bench: &mut Bencher) {
let buf = Vec::<u8>::with_capacity(FRAGMENT.len() * 50);
let mut writer = QuickXmlWriter::new(buf);
let frag: SymbolId<Ix> = FRAGMENT.intern();
bench.iter(|| {
(0..500).for_each(|_| {
(0..50).for_each(|_| {
writer
.write_event(XmlEvent::Text(BytesText::from_escaped_str(
Cow::Borrowed(&frag.lookup_str() as &str),
@ -249,13 +249,13 @@ This is pretend fragment text. We need a lot of it.</fragment>
// This test and the above are expected to perform similarly, and can
// vary wildy run-to-run.
#[bench]
fn xir_text_500(bench: &mut Bencher) {
let mut buf = Vec::<u8>::new();
fn xir_text_50(bench: &mut Bencher) {
let mut buf = Vec::<u8>::with_capacity(FRAGMENT.len() * 50);
let frag: SymbolId<Ix> = FRAGMENT.intern();
let span = Span::from_byte_interval((0, 0), "path".intern());
bench.iter(|| {
(0..500).for_each(|_| {
(0..50).for_each(|_| {
Token::Text(Text::Escaped(frag), span)
.write(&mut buf, Default::default())
.unwrap();