75 lines
1.8 KiB
Rust
75 lines
1.8 KiB
Rust
use std::{
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io,
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sync::{Arc, Barrier},
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thread,
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time::{Duration, Instant},
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};
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use tracing::dispatch::Dispatch;
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#[derive(Clone)]
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pub(super) struct MultithreadedBench {
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start: Arc<Barrier>,
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end: Arc<Barrier>,
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dispatch: Dispatch,
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}
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#[allow(dead_code)]
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impl MultithreadedBench {
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pub(super) fn new(dispatch: Dispatch) -> Self {
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Self {
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start: Arc::new(Barrier::new(5)),
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end: Arc::new(Barrier::new(5)),
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dispatch,
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}
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}
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pub(super) fn thread(&self, f: impl FnOnce() + Send + 'static) -> &Self {
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self.thread_with_setup(|start| {
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start.wait();
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f()
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})
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}
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pub(super) fn thread_with_setup(&self, f: impl FnOnce(&Barrier) + Send + 'static) -> &Self {
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let this = self.clone();
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thread::spawn(move || {
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let dispatch = this.dispatch.clone();
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tracing::dispatch::with_default(&dispatch, move || {
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f(&this.start);
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this.end.wait();
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})
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});
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self
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}
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pub(super) fn run(&self) -> Duration {
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self.start.wait();
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let t0 = Instant::now();
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self.end.wait();
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t0.elapsed()
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}
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}
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/// A fake writer that doesn't actually do anything.
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///
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/// We want to measure the collectors's overhead, *not* the performance of
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/// stdout/file writers. Using a no-op Write implementation lets us only measure
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/// the collectors's overhead.
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pub(super) struct NoWriter;
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#[allow(dead_code)]
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impl io::Write for NoWriter {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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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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Ok(())
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}
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}
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#[allow(dead_code)]
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impl NoWriter {
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pub(super) fn new() -> Self {
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Self
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}
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}
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