1 // The Computer Language Benchmarks Game
2 // http://benchmarksgame.alioth.debian.org/
4 // contributed by the Rust Project Developers
6 // Copyright (c) 2012-2014 The Rust Project Developers
8 // All rights reserved.
10 // Redistribution and use in source and binary forms, with or without
11 // modification, are permitted provided that the following conditions
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15 // notice, this list of conditions and the following disclaimer.
17 // - Redistributions in binary form must reproduce the above copyright
18 // notice, this list of conditions and the following disclaimer in
19 // the documentation and/or other materials provided with the
22 // - Neither the name of "The Computer Language Benchmarks Game" nor
23 // the name of "The Computer Language Shootout Benchmarks" nor the
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25 // products derived from this software without specific prior
26 // written permission.
28 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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42 #![allow(experimental)]
44 // ignore-pretty very bad with line comments
50 use std::thread::Thread;
53 const LIMIT: f64 = 2.0;
54 const WORKERS: uint = 16;
57 fn mandelbrot<W: io::Writer>(w: uint, mut out: W) -> io::IoResult<()> {
58 assert!(WORKERS % 2 == 0);
60 // Ensure w and h are multiples of 8.
61 let w = (w + 7) / 8 * 8;
64 let chunk_size = h / WORKERS;
66 // Account for remainders in workload division, e.g. 1000 / 16 = 62.5
67 let last_chunk_size = if h % WORKERS != 0 {
68 chunk_size + h % WORKERS
74 let inverse_w_doubled = 2.0 / w as f64;
75 let inverse_h_doubled = 2.0 / h as f64;
76 let v_inverses = f64x2(inverse_w_doubled, inverse_h_doubled);
77 let v_consts = f64x2(1.5, 1.0);
79 // A lot of this code assumes this (so do other lang benchmarks)
81 let mut precalc_r = Vec::with_capacity(w);
82 let mut precalc_i = Vec::with_capacity(h);
84 let precalc_futures = range(0, WORKERS).map(|i| {
85 Thread::spawn(move|| {
86 let mut rs = Vec::with_capacity(w / WORKERS);
87 let mut is = Vec::with_capacity(w / WORKERS);
89 let start = i * chunk_size;
90 let end = if i == (WORKERS - 1) {
91 start + last_chunk_size
96 // This assumes w == h
97 for x in range(start, end) {
99 let xy = f64x2(xf, xf);
101 let f64x2(r, i) = xy * v_inverses - v_consts;
108 }).collect::<Vec<_>>();
110 for res in precalc_futures.into_iter() {
111 let (rs, is) = res.join().ok().unwrap();
112 precalc_r.extend(rs.into_iter());
113 precalc_i.extend(is.into_iter());
116 assert_eq!(precalc_r.len(), w);
117 assert_eq!(precalc_i.len(), h);
119 let arc_init_r = Arc::new(precalc_r);
120 let arc_init_i = Arc::new(precalc_i);
122 let data = range(0, WORKERS).map(|i| {
123 let vec_init_r = arc_init_r.clone();
124 let vec_init_i = arc_init_i.clone();
126 Thread::spawn(move|| {
127 let mut res: Vec<u8> = Vec::with_capacity((chunk_size * w) / 8);
128 let init_r_slice = vec_init_r.as_slice();
130 let start = i * chunk_size;
131 let end = if i == (WORKERS - 1) {
132 start + last_chunk_size
137 for &init_i in vec_init_i.slice(start, end).iter() {
138 write_line(init_i, init_r_slice, &mut res);
143 }).collect::<Vec<_>>();
145 try!(writeln!(&mut out as &mut Writer, "P4\n{} {}", w, h));
146 for res in data.into_iter() {
147 try!(out.write(res.join().ok().unwrap().as_slice()));
152 fn write_line(init_i: f64, vec_init_r: &[f64], res: &mut Vec<u8>) {
153 let v_init_i : f64x2 = f64x2(init_i, init_i);
154 let v_2 : f64x2 = f64x2(2.0, 2.0);
155 const LIMIT_SQUARED: f64 = LIMIT * LIMIT;
157 for chunk_init_r in vec_init_r.chunks(8) {
158 let mut cur_byte = 0xff;
162 let v_init_r = f64x2(chunk_init_r[i], chunk_init_r[i + 1]);
163 let mut cur_r = v_init_r;
164 let mut cur_i = v_init_i;
165 let mut r_sq = v_init_r * v_init_r;
166 let mut i_sq = v_init_i * v_init_i;
169 for _ in range(0, ITER) {
173 cur_i = v_2 * r * i + v_init_i;
174 cur_r = r_sq - i_sq + v_init_r;
176 let f64x2(bit1, bit2) = r_sq + i_sq;
178 if bit1 > LIMIT_SQUARED {
183 if bit2 > LIMIT_SQUARED {
188 r_sq = cur_r * cur_r;
189 i_sq = cur_i * cur_i;
192 cur_byte = (cur_byte << 2) + b;
196 res.push(cur_byte^-1);
201 let args = os::args();
202 let args = args.as_slice();
203 let res = if args.len() < 2 {
204 println!("Test mode: do not dump the image because it's not utf8, \
205 which interferes with the test runner.");
206 mandelbrot(1000, io::util::NullWriter)
208 mandelbrot(args[1].parse().unwrap(), io::stdout())