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#![feature(test)]
extern crate futures;
extern crate test;
use futures::{Future, Poll, Async};
use futures::task::{self, Task};
use test::Bencher;
#[bench]
fn thread_yield_single_thread_one_wait(b: &mut Bencher) {
const NUM: usize = 10_000;
struct Yield {
rem: usize,
}
impl Future for Yield {
type Item = ();
type Error = ();
fn poll(&mut self) -> Poll<(), ()> {
if self.rem == 0 {
Ok(Async::Ready(()))
} else {
self.rem -= 1;
task::current().notify();
Ok(Async::NotReady)
}
}
}
b.iter(|| {
let y = Yield { rem: NUM };
y.wait().unwrap();
});
}
#[bench]
fn thread_yield_single_thread_many_wait(b: &mut Bencher) {
const NUM: usize = 10_000;
struct Yield {
rem: usize,
}
impl Future for Yield {
type Item = ();
type Error = ();
fn poll(&mut self) -> Poll<(), ()> {
if self.rem == 0 {
Ok(Async::Ready(()))
} else {
self.rem -= 1;
task::current().notify();
Ok(Async::NotReady)
}
}
}
b.iter(|| {
for _ in 0..NUM {
let y = Yield { rem: 1 };
y.wait().unwrap();
}
});
}
#[bench]
fn thread_yield_multi_thread(b: &mut Bencher) {
use std::sync::mpsc;
use std::thread;
const NUM: usize = 1_000;
let (tx, rx) = mpsc::sync_channel::<Task>(10_000);
struct Yield {
rem: usize,
tx: mpsc::SyncSender<Task>,
}
impl Future for Yield {
type Item = ();
type Error = ();
fn poll(&mut self) -> Poll<(), ()> {
if self.rem == 0 {
Ok(Async::Ready(()))
} else {
self.rem -= 1;
self.tx.send(task::current()).unwrap();
Ok(Async::NotReady)
}
}
}
thread::spawn(move || {
while let Ok(task) = rx.recv() {
task.notify();
}
});
b.iter(move || {
let y = Yield {
rem: NUM,
tx: tx.clone(),
};
y.wait().unwrap();
});
}
|
