| // 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. |
| |
| */ |
| |
| #![feature(duration, duration_span, rustc_private)] |
| |
| extern crate getopts; |
| |
| use std::sync::mpsc::{channel, Sender}; |
| use std::env; |
| use std::result::Result::{Ok, Err}; |
| use std::thread; |
| use std::time::Duration; |
| |
| fn fib(n: isize) -> isize { |
| fn pfib(tx: &Sender<isize>, n: isize) { |
| if n == 0 { |
| tx.send(0).unwrap(); |
| } else if n <= 2 { |
| tx.send(1).unwrap(); |
| } else { |
| let (tx1, rx) = channel(); |
| let tx2 = tx1.clone(); |
| thread::spawn(move|| pfib(&tx2, n - 1)); |
| let tx2 = tx1.clone(); |
| thread::spawn(move|| pfib(&tx2, n - 2)); |
| tx.send(rx.recv().unwrap() + rx.recv().unwrap()); |
| } |
| } |
| |
| let (tx, rx) = channel(); |
| thread::spawn(move|| pfib(&tx, n) ); |
| rx.recv().unwrap() |
| } |
| |
| struct Config { |
| stress: bool |
| } |
| |
| fn parse_opts(argv: Vec<String> ) -> Config { |
| let opts = vec!(getopts::optflag("", "stress", "")); |
| |
| let argv = argv.iter().map(|x| x.to_string()).collect::<Vec<_>>(); |
| let opt_args = &argv[1..argv.len()]; |
| |
| match getopts::getopts(opt_args, &opts) { |
| Ok(ref m) => { |
| return Config {stress: m.opt_present("stress")} |
| } |
| Err(_) => { panic!(); } |
| } |
| } |
| |
| fn stress_task(id: isize) { |
| let mut i = 0; |
| loop { |
| let n = 15; |
| assert_eq!(fib(n), fib(n)); |
| i += 1; |
| println!("{}: Completed {} iterations", id, i); |
| } |
| } |
| |
| fn stress(num_tasks: isize) { |
| let mut results = Vec::new(); |
| for i in 0..num_tasks { |
| results.push(thread::spawn(move|| { |
| stress_task(i); |
| })); |
| } |
| for r in results { |
| let _ = r.join(); |
| } |
| } |
| |
| fn main() { |
| let args = env::args(); |
| let args = if env::var_os("RUST_BENCH").is_some() { |
| vec!("".to_string(), "20".to_string()) |
| } else if args.len() <= 1 { |
| vec!("".to_string(), "8".to_string()) |
| } else { |
| args.map(|x| x.to_string()).collect() |
| }; |
| |
| let opts = parse_opts(args.clone()); |
| |
| if opts.stress { |
| stress(2); |
| } else { |
| let max = args[1].parse::<isize>().unwrap(); |
| |
| let num_trials = 10; |
| |
| for n in 1..max + 1 { |
| for _ in 0..num_trials { |
| let mut fibn = None; |
| let dur = Duration::span(|| fibn = Some(fib(n))); |
| let fibn = fibn.unwrap(); |
| |
| println!("{}\t{}\t{:?}", n, fibn, dur); |
| } |
| } |
| } |
| } |