76 lines
2.1 KiB
Rust
76 lines
2.1 KiB
Rust
//! Benchmarks for write performance.
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use criterion::{BatchSize, Criterion};
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use std::{
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hint,
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io::{self, Read, Write},
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time::{Duration, Instant},
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};
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use tungstenite::{Message, WebSocket};
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const MOCK_WRITE_LEN: usize = 8 * 1024 * 1024;
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/// `Write` impl that simulates slowish writes and slow flushes.
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///
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/// Each `write` can buffer up to 8 MiB before flushing but takes an additional **~80ns**
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/// to simulate stuff going on in the underlying stream.
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/// Each `flush` takes **~8µs** to simulate flush io.
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struct MockWrite(Vec<u8>);
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impl Read for MockWrite {
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fn read(&mut self, _: &mut [u8]) -> io::Result<usize> {
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Err(io::Error::new(io::ErrorKind::WouldBlock, "reads not supported"))
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}
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}
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impl Write for MockWrite {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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if self.0.len() + buf.len() > MOCK_WRITE_LEN {
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self.flush()?;
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}
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// simulate io
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spin(Duration::from_nanos(80));
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self.0.extend(buf);
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Ok(buf.len())
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}
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fn flush(&mut self) -> io::Result<()> {
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if !self.0.is_empty() {
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// simulate io
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spin(Duration::from_micros(8));
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self.0.clear();
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}
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Ok(())
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}
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}
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fn spin(duration: Duration) {
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let a = Instant::now();
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while a.elapsed() < duration {
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hint::spin_loop();
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}
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}
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fn benchmark(c: &mut Criterion) {
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// Writes 100k small json text messages then flushes
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c.bench_function("write 100k small texts then flush", |b| {
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let mut ws = WebSocket::from_raw_socket(
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MockWrite(Vec::with_capacity(MOCK_WRITE_LEN)),
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tungstenite::protocol::Role::Server,
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None,
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);
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b.iter_batched(
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|| (0..100_000).map(|i| Message::Text(format!("{{\"id\":{i}}}"))),
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|batch| {
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for msg in batch {
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ws.write(msg).unwrap();
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}
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ws.flush().unwrap();
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},
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BatchSize::SmallInput,
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)
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});
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}
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criterion::criterion_group!(write_benches, benchmark);
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criterion::criterion_main!(write_benches);
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