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#![feature(test)]
extern crate test;
extern crate futures;
#[macro_use]
extern crate tokio_core;
use std::io;
use std::sync::Arc;
use std::sync::atomic::{AtomicBool, Ordering};
use std::net::SocketAddr;
use futures::{Future, Poll};
use tokio_core::net::UdpSocket;
use tokio_core::reactor::Core;
use test::Bencher;
use std::thread;
use std::time::Duration;
use futures::stream::Stream;
/// UDP echo server
struct EchoServer {
socket : UdpSocket,
buf : Vec<u8>,
to_send : Option<(usize, SocketAddr)>,
stop : Arc<AtomicBool>,
}
impl EchoServer {
fn new(s : UdpSocket, stop : Arc<AtomicBool>) -> Self {
EchoServer {
socket: s,
to_send: None,
buf: vec![0u8; 1600],
stop: stop,
}
}
}
impl Future for EchoServer {
type Item = ();
type Error = io::Error;
fn poll(&mut self) -> Poll<(), io::Error> {
loop {
if self.stop.load(Ordering::SeqCst) {
return Ok(futures::Async::Ready(()))
}
if let Some((size, peer)) = self.to_send.take() {
match self.socket.send_to(&self.buf[..size], &peer) {
Err(e) => {
self.to_send = Some((size, peer));
return try_nb!(Err(e));
},
Ok(_) => { }
}
}
self.to_send = Some(
try_nb!(self.socket.recv_from(&mut self.buf))
);
}
}
}
/// UDP echo server
struct ChanServer {
rx : tokio_core::channel::Receiver<usize>,
tx : tokio_core::channel::Sender<usize>,
buf : Option<usize>,
stop : Arc<AtomicBool>,
}
impl ChanServer {
fn new(tx : tokio_core::channel::Sender<usize>, rx : tokio_core::channel::Receiver<usize>, stop : Arc<AtomicBool>) -> Self {
ChanServer {
rx: rx,
tx: tx,
buf: None,
stop: stop,
}
}
}
impl Future for ChanServer {
type Item = ();
type Error = io::Error;
fn poll(&mut self) -> Poll<(), io::Error> {
loop {
if self.stop.load(Ordering::SeqCst) {
return Ok(futures::Async::Ready(()))
}
if let Some(u) = self.buf.take() {
match self.tx.send(u) {
Err(e) => {
self.buf = Some(u);
return try_nb!(Err(e));
},
Ok(_) => { }
}
}
match self.rx.poll() {
Ok(futures::Async::Ready(None)) => return Ok(futures::Async::Ready(())),
Ok(futures::Async::Ready(Some(t))) => { self.buf = Some(t) },
Ok(futures::Async::NotReady) => return Ok(futures::Async::NotReady),
Err(e) => return try_nb!(Err(e)),
}
}
}
}
#[bench]
fn udp_echo_latency(b: &mut Bencher) {
let server_addr= "127.0.0.1:7398".to_string();
let server_addr = server_addr.parse::<SocketAddr>().unwrap();
let client_addr= "127.0.0.1:7399".to_string();
let client_addr = client_addr.parse::<SocketAddr>().unwrap();
let stop = Arc::new(AtomicBool::new(false));
let stop2 = stop.clone();
let child = thread::spawn(move || {
let mut l = Core::new().unwrap();
let handle = l.handle();
let socket = tokio_core::net::UdpSocket::bind(&server_addr, &handle).unwrap();
let server = EchoServer::new(socket, stop);
l.run(server).unwrap();
});
// TODO: More reliable way to bind server socket and start server
// first
thread::sleep(Duration::from_millis(100));
let client = std::net::UdpSocket::bind(client_addr).unwrap();
let mut buf = [0u8; 1000];
// warmup phase; for some reason initial couple of
// rounds is much slower
//
// TODO: Describe the exact reasons; caching? branch predictor? lazy closures?
for _ in 0..1000 {
client.send_to(&buf, &server_addr).unwrap();
let _ = client.recv_from(&mut buf).unwrap();
}
b.iter(|| {
client.send_to(&buf, &server_addr).unwrap();
let _ = client.recv_from(&mut buf).unwrap();
});
// Stop the server; TODO: Use better method
stop2.store(true, Ordering::SeqCst);
thread::sleep(Duration::from_millis(1));
client.send_to(&buf, &server_addr).unwrap();
child.join().unwrap();
}
#[bench]
fn channel_latency(b: &mut Bencher) {
let stop = Arc::new(AtomicBool::new(false));
let stop2 = stop.clone();
// TODO: Any way to start Loop on a separate thread and yet get
// a tokio_core::channel to it?
let (tx, rx) = std::sync::mpsc::channel();
let child = thread::spawn(move || {
let mut l = Core::new().unwrap();
let handle = l.handle();
let (in_tx, in_rx) = tokio_core::channel::channel(&handle).unwrap();
let (out_tx, out_rx) = tokio_core::channel::channel(&handle).unwrap();
let server = ChanServer::new(out_tx, in_rx, stop);
tx.send((in_tx, out_rx)).unwrap();
l.run(server).unwrap();
});
let (in_tx, out_rx) = rx.recv().unwrap();
// TODO: More reliable way to bind server socket and start server
// first
thread::sleep(Duration::from_millis(100));
let mut rx_iter = out_rx.wait();
// warmup phase; for some reason initial couple of
// rounds is much slower
//
// TODO: Describe the exact reasons; caching? branch predictor? lazy closures?
for _ in 0..1000 {
in_tx.send(1usize).unwrap();
let _ = rx_iter.next();
}
b.iter(|| {
in_tx.send(1usize).unwrap();
let _ = rx_iter.next();
});
// Stop the server; TODO: Use better method
stop2.store(true, Ordering::SeqCst);
thread::sleep(Duration::from_millis(1));
in_tx.send(1usize).unwrap();
child.join().unwrap();
}
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