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|
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Compare bounded and unbounded protocol performance.
// xfail-pretty
extern mod std;
use core::cell::Cell;
use core::pipes::*;
use std::time::precise_time_s;
proto! pingpong (
ping: send {
ping -> pong
}
pong: recv {
pong -> ping
}
)
proto! pingpong_unbounded (
ping: send {
ping -> pong
}
pong: recv {
pong -> ping
}
you_will_never_catch_me: send {
never_ever_ever -> you_will_never_catch_me
}
)
// This stuff should go in libcore::pipes
macro_rules! move_it (
{ $x:expr } => { let t = *ptr::to_unsafe_ptr(&($x)); t }
)
macro_rules! follow (
{
$($message:path($($x: ident),+) -> $next:ident $e:expr)+
} => (
|m| match m {
$(Some($message($($x,)* next)) => {
let $next = next;
$e })+
_ => { fail!() }
}
);
{
$($message:path -> $next:ident $e:expr)+
} => (
|m| match m {
$(Some($message(next)) => {
let $next = next;
$e })+
_ => { fail!() }
}
)
)
/** Spawn a task to provide a service.
It takes an initialization function that produces a send and receive
endpoint. The send endpoint is returned to the caller and the receive
endpoint is passed to the new task.
*/
pub fn spawn_service<T:Owned,Tb:Owned>(
init: extern fn() -> (SendPacketBuffered<T, Tb>,
RecvPacketBuffered<T, Tb>),
service: ~fn(v: RecvPacketBuffered<T, Tb>))
-> SendPacketBuffered<T, Tb> {
let (client, server) = init();
// This is some nasty gymnastics required to safely move the pipe
// into a new task.
let server = Cell(server);
do task::spawn {
service(server.take());
}
client
}
/** Like `spawn_service_recv`, but for protocols that start in the
receive state.
*/
pub fn spawn_service_recv<T:Owned,Tb:Owned>(
init: extern fn() -> (RecvPacketBuffered<T, Tb>,
SendPacketBuffered<T, Tb>),
service: ~fn(v: SendPacketBuffered<T, Tb>))
-> RecvPacketBuffered<T, Tb> {
let (client, server) = init();
// This is some nasty gymnastics required to safely move the pipe
// into a new task.
let server = Cell(server);
do task::spawn {
service(server.take())
}
client
}
fn switch<T:Owned,Tb:Owned,U>(+endp: core::pipes::RecvPacketBuffered<T, Tb>,
f: &fn(+v: Option<T>) -> U) -> U {
f(core::pipes::try_recv(endp))
}
// Here's the benchmark
fn bounded(count: uint) {
use pingpong::*;
let mut ch = do spawn_service(init) |ch| {
let mut count = count;
let mut ch = ch;
while count > 0 {
ch = switch(ch, follow! (
ping -> next { server::pong(next) }
));
count -= 1;
}
};
let mut count = count;
while count > 0 {
let ch_ = client::ping(ch);
ch = switch(ch_, follow! (
pong -> next { next }
));
count -= 1;
}
}
fn unbounded(count: uint) {
use pingpong_unbounded::*;
let mut ch = do spawn_service(init) |ch| {
let mut count = count;
let mut ch = ch;
while count > 0 {
ch = switch(ch, follow! (
ping -> next { server::pong(next) }
));
count -= 1;
}
};
let mut count = count;
while count > 0 {
let ch_ = client::ping(ch);
ch = switch(ch_, follow! (
pong -> next { next }
));
count -= 1;
}
}
fn timeit(f: &fn()) -> float {
let start = precise_time_s();
f();
let stop = precise_time_s();
stop - start
}
fn main() {
let count = if os::getenv(~"RUST_BENCH").is_some() {
250000
} else {
100
};
let bounded = do timeit { bounded(count) };
let unbounded = do timeit { unbounded(count) };
io::println(fmt!("count: %?\n", count));
io::println(fmt!("bounded: %? s\t(%? μs/message)",
bounded, bounded * 1000000. / (count as float)));
io::println(fmt!("unbounded: %? s\t(%? μs/message)",
unbounded, unbounded * 1000000. / (count as float)));
io::println(fmt!("\n\
bounded is %?%% faster",
(unbounded - bounded) / bounded * 100.));
}
|
