61ed2cfb55
Big fish fried here:
extra::json
most of the compiler
extra::io_util removed
extra::fileinput removed
Fish left to fry
extra::ebml
127 lines
3.0 KiB
Rust
127 lines
3.0 KiB
Rust
// -*- rust -*-
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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/*
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A parallel version of fibonacci numbers.
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This version is meant mostly as a way of stressing and benchmarking
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the task system. It supports a lot of old command-line arguments to
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control how it runs.
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*/
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extern mod extra;
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use extra::{time, getopts};
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use std::comm::{stream, SharedChan};
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use std::os;
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use std::result::{Ok, Err};
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use std::task;
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use std::uint;
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fn fib(n: int) -> int {
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fn pfib(c: &SharedChan<int>, n: int) {
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if n == 0 {
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c.send(0);
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} else if n <= 2 {
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c.send(1);
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} else {
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let (pp, cc) = stream();
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let cc = SharedChan::new(cc);
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let ch = cc.clone();
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task::spawn(|| pfib(&ch, n - 1) );
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let ch = cc.clone();
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task::spawn(|| pfib(&ch, n - 2) );
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c.send(pp.recv() + pp.recv());
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}
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}
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let (p, ch) = stream();
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let ch = SharedChan::new(ch);
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let _t = task::spawn(|| pfib(&ch, n) );
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p.recv()
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}
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struct Config {
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stress: bool
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}
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fn parse_opts(argv: ~[~str]) -> Config {
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let opts = ~[getopts::optflag("stress")];
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let opt_args = argv.slice(1, argv.len());
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match getopts::getopts(opt_args, opts) {
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Ok(ref m) => {
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return Config {stress: m.opt_present("stress")}
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}
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Err(_) => { fail!(); }
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}
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}
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fn stress_task(id: int) {
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let mut i = 0;
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loop {
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let n = 15;
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assert_eq!(fib(n), fib(n));
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i += 1;
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error!("{}: Completed {} iterations", id, i);
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}
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}
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fn stress(num_tasks: int) {
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let mut results = ~[];
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for i in range(0, num_tasks) {
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let mut builder = task::task();
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results.push(builder.future_result());
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do builder.spawn {
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stress_task(i);
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}
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}
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for r in results.iter() {
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r.recv();
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}
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}
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fn main() {
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let args = os::args();
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let args = if os::getenv("RUST_BENCH").is_some() {
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~[~"", ~"20"]
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} else if args.len() <= 1u {
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~[~"", ~"8"]
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} else {
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args
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};
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let opts = parse_opts(args.clone());
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if opts.stress {
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stress(2);
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} else {
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let max = uint::parse_bytes(args[1].as_bytes(), 10u).unwrap() as int;
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let num_trials = 10;
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for n in range(1, max + 1) {
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for _ in range(0, num_trials) {
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let start = time::precise_time_ns();
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let fibn = fib(n);
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let stop = time::precise_time_ns();
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let elapsed = stop - start;
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println!("{}\t{}\t{}", n, fibn, elapsed.to_str());
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}
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}
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}
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}
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