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auto merge of #12766 : TeXitoi/rust/fix-shootout-spectralnorm, r=alexcrichton

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bors 2014-03-10 20:07:02 -07:00
commit 294d3ddb89
1 changed files with 18 additions and 11 deletions
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29
src/test/bench/shootout-spectralnorm.rs
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@ -1,4 +1,4 @@
// Copyright 2012-2013-2014 The Rust Project Developers. See the COPYRIGHT
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
@ -8,8 +8,6 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// ignore-test arcs no longer unwrap
extern crate sync;
use std::from_str::FromStr;
@ -17,7 +15,6 @@ use std::iter::count;
use std::cmp::min;
use std::os;
use std::vec::from_elem;
use sync::Arc;
use sync::RWArc;
fn A(i: uint, j: uint) -> f64 {
@ -33,12 +30,18 @@ fn dot(v: &[f64], u: &[f64]) -> f64 {
}
fn mult(v: RWArc<~[f64]>, out: RWArc<~[f64]>, f: fn(&~[f64], uint) -> f64) {
let wait = Arc::new(());
// We lanch in different tasks the work to be done. To finish
// this fuction, we need to wait for the completion of every
// tasks. To do that, we give to each tasks a wait_chan that we
// drop at the end of the work. At the end of this function, we
// wait until the channel hang up.
let (wait_port, wait_chan) = Chan::new();
let len = out.read(|out| out.len());
let chunk = len / 100 + 1;
for chk in count(0, chunk) {
if chk >= len {break;}
let w = wait.clone();
let w = wait_chan.clone();
let v = v.clone();
let out = out.clone();
spawn(proc() {
@ -46,10 +49,13 @@ fn mult(v: RWArc<~[f64]>, out: RWArc<~[f64]>, f: fn(&~[f64], uint) -> f64) {
let val = v.read(|v| f(v, i));
out.write(|out| out[i] = val);
}
let _ = w;
drop(w)
});
}
let _ = wait.unwrap();
// wait until the channel hang up (every task finished)
drop(wait_chan);
for () in wait_port.iter() {}
}
fn mult_Av_impl(v: &~[f64], i: uint) -> f64 {
@ -97,7 +103,8 @@ fn main() {
mult_AtAv(u.clone(), v.clone(), tmp.clone());
mult_AtAv(v.clone(), u.clone(), tmp.clone());
}
let u = u.unwrap();
let v = v.unwrap();
println!("{:.9f}", (dot(u,v) / dot(v,v)).sqrt());
u.read(|u| v.read(|v| {
println!("{:.9f}", (dot(*u, *v) / dot(*v, *v)).sqrt());
}))
}