114 lines
3.2 KiB
Rust
114 lines
3.2 KiB
Rust
// Copyright 2012-2014 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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extern crate sync;
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use std::from_str::FromStr;
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use std::iter::count;
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use std::cmp::min;
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use std::os;
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use std::slice::from_elem;
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use sync::{Arc, RWLock};
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fn A(i: uint, j: uint) -> f64 {
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((i + j) * (i + j + 1) / 2 + i + 1) as f64
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}
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fn dot(v: &[f64], u: &[f64]) -> f64 {
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let mut sum = 0.0;
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for (&v_i, &u_i) in v.iter().zip(u.iter()) {
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sum += v_i * u_i;
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}
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sum
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}
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fn mult(v: Arc<RWLock<Vec<f64>>>, out: Arc<RWLock<Vec<f64>>>,
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f: fn(&Vec<f64>, uint) -> f64) {
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// We lanch in different tasks the work to be done. To finish
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// this fuction, we need to wait for the completion of every
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// tasks. To do that, we give to each tasks a wait_chan that we
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// drop at the end of the work. At the end of this function, we
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// wait until the channel hang up.
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let (tx, rx) = channel();
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let len = out.read().len();
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let chunk = len / 100 + 1;
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for chk in count(0, chunk) {
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if chk >= len {break;}
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let tx = tx.clone();
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let v = v.clone();
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let out = out.clone();
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spawn(proc() {
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for i in range(chk, min(len, chk + chunk)) {
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let val = f(&*v.read(), i);
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*out.write().get_mut(i) = val;
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}
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drop(tx)
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});
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}
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// wait until the channel hang up (every task finished)
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drop(tx);
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for () in rx.iter() {}
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}
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fn mult_Av_impl(v: &Vec<f64> , i: uint) -> f64 {
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let mut sum = 0.;
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for (j, &v_j) in v.iter().enumerate() {
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sum += v_j / A(i, j);
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}
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sum
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}
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fn mult_Av(v: Arc<RWLock<Vec<f64>>>, out: Arc<RWLock<Vec<f64>>>) {
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mult(v, out, mult_Av_impl);
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}
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fn mult_Atv_impl(v: &Vec<f64> , i: uint) -> f64 {
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let mut sum = 0.;
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for (j, &v_j) in v.iter().enumerate() {
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sum += v_j / A(j, i);
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}
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sum
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}
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fn mult_Atv(v: Arc<RWLock<Vec<f64>>>, out: Arc<RWLock<Vec<f64>>>) {
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mult(v, out, mult_Atv_impl);
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}
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fn mult_AtAv(v: Arc<RWLock<Vec<f64>>>, out: Arc<RWLock<Vec<f64>>>,
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tmp: Arc<RWLock<Vec<f64>>>) {
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mult_Av(v, tmp.clone());
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mult_Atv(tmp, out);
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}
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fn main() {
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let args = os::args();
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let n = if os::getenv("RUST_BENCH").is_some() {
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5500
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} else if args.len() < 2 {
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2000
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} else {
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FromStr::from_str(args[1]).unwrap()
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};
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let u = Arc::new(RWLock::new(Vec::from_elem(n, 1.)));
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let v = Arc::new(RWLock::new(Vec::from_elem(n, 1.)));
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let tmp = Arc::new(RWLock::new(Vec::from_elem(n, 1.)));
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for _ in range(0, 10) {
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mult_AtAv(u.clone(), v.clone(), tmp.clone());
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mult_AtAv(v.clone(), u.clone(), tmp.clone());
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}
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let u = u.read();
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let v = v.read();
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println!("{:.9f}", (dot(u.as_slice(), v.as_slice()) /
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dot(v.as_slice(), v.as_slice())).sqrt());
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}
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