130 lines
3.0 KiB
Rust
130 lines
3.0 KiB
Rust
// -*- rust -*-
|
|
// 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.
|
|
|
|
|
|
/*
|
|
A parallel version of fibonacci numbers.
|
|
|
|
This version is meant mostly as a way of stressing and benchmarking
|
|
the task system. It supports a lot of old command-line arguments to
|
|
control how it runs.
|
|
|
|
*/
|
|
|
|
#[legacy_modes];
|
|
|
|
extern mod std;
|
|
|
|
use std::{time, getopts};
|
|
use core::int::range;
|
|
use core::comm::*;
|
|
use core::io::WriterUtil;
|
|
|
|
use core::result;
|
|
use core::result::{Ok, Err};
|
|
|
|
fn fib(n: int) -> int {
|
|
fn pfib(c: Chan<int>, n: int) {
|
|
if n == 0 {
|
|
c.send(0);
|
|
} else if n <= 2 {
|
|
c.send(1);
|
|
} else {
|
|
let p = PortSet::new();
|
|
let ch = p.chan();
|
|
task::spawn(|| pfib(ch, n - 1) );
|
|
let ch = p.chan();
|
|
task::spawn(|| pfib(ch, n - 2) );
|
|
c.send(p.recv() + p.recv());
|
|
}
|
|
}
|
|
|
|
let (p, ch) = stream();
|
|
let _t = task::spawn(|| pfib(ch, n) );
|
|
p.recv()
|
|
}
|
|
|
|
struct Config {
|
|
stress: bool
|
|
}
|
|
|
|
fn parse_opts(argv: ~[~str]) -> Config {
|
|
let opts = ~[getopts::optflag(~"stress")];
|
|
|
|
let opt_args = vec::slice(argv, 1, argv.len());
|
|
|
|
match getopts::getopts(opt_args, opts) {
|
|
Ok(ref m) => {
|
|
return Config {stress: getopts::opt_present(m, ~"stress")}
|
|
}
|
|
Err(_) => { fail!(); }
|
|
}
|
|
}
|
|
|
|
fn stress_task(&&id: int) {
|
|
let mut i = 0;
|
|
loop {
|
|
let n = 15;
|
|
assert!((fib(n) == fib(n)));
|
|
i += 1;
|
|
error!("%d: Completed %d iterations", id, i);
|
|
}
|
|
}
|
|
|
|
fn stress(num_tasks: int) {
|
|
let mut results = ~[];
|
|
for range(0, num_tasks) |i| {
|
|
do task::task().future_result(|+r| {
|
|
results.push(r);
|
|
}).spawn {
|
|
stress_task(i);
|
|
}
|
|
}
|
|
for results.each |r| { r.recv(); }
|
|
}
|
|
|
|
fn main() {
|
|
let args = os::args();
|
|
let args = if os::getenv(~"RUST_BENCH").is_some() {
|
|
~[~"", ~"20"]
|
|
} else if args.len() <= 1u {
|
|
~[~"", ~"8"]
|
|
} else {
|
|
args
|
|
};
|
|
|
|
let opts = parse_opts(copy args);
|
|
|
|
if opts.stress {
|
|
stress(2);
|
|
} else {
|
|
let max = uint::parse_bytes(str::to_bytes(args[1]),
|
|
10u).get() as int;
|
|
|
|
let num_trials = 10;
|
|
|
|
let out = io::stdout();
|
|
|
|
for range(1, max + 1) |n| {
|
|
for range(0, num_trials) |_i| {
|
|
let start = time::precise_time_ns();
|
|
let fibn = fib(n);
|
|
let stop = time::precise_time_ns();
|
|
|
|
let elapsed = stop - start;
|
|
|
|
out.write_line(fmt!("%d\t%d\t%s", n, fibn,
|
|
u64::to_str(elapsed)));
|
|
}
|
|
}
|
|
}
|
|
}
|