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// Copyright 2014 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.
// 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.
use std::sync::mpsc::channel;
use std::env;
use std::thread;
// This is a simple bench that creates M pairs of threads. These
// threads ping-pong back and forth over a pair of streams. This is a
// canonical message-passing benchmark as it heavily strains message
// passing and almost nothing else.
fn ping_pong_bench(n: usize, m: usize) {
// Create pairs of threads that pingpong back and forth.
fn run_pair(n: usize) {
// Create a channel: A->B
let (atx, arx) = channel();
// Create a channel: B->A
let (btx, brx) = channel();
let guard_a = thread::spawn(move|| {
let (tx, rx) = (atx, brx);
for _ in 0..n {
tx.send(()).unwrap();
rx.recv().unwrap();
}
});
let guard_b = thread::spawn(move|| {
let (tx, rx) = (btx, arx);
for _ in 0..n {
rx.recv().unwrap();
tx.send(()).unwrap();
}
});
guard_a.join().ok();
guard_b.join().ok();
}
for _ in 0..m {
run_pair(n)
}
}
fn main() {
let mut args = env::args();
let (n, m) = if args.len() == 3 {
let n = args.nth(1).unwrap().parse::<usize>().unwrap();
let m = args.next().unwrap().parse::<usize>().unwrap();
(n, m)
} else {
(10000, 4)
};
ping_pong_bench(n, m);
}
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