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.
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11 // modification, are permitted provided that the following conditions
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18 // notice, this list of conditions and the following disclaimer in
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23 // the name of "The Computer Language Shootout Benchmarks" nor the
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25 // products derived from this software without specific prior
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43 // ignore-pretty very bad with line comments
49 use std::thread::Thread;
51 const ITER: usize = 50;
52 const LIMIT: f64 = 2.0;
53 const WORKERS: usize = 16;
56 fn mandelbrot<W: old_io::Writer>(w: usize, mut out: W) -> old_io::IoResult<()> {
57 assert!(WORKERS % 2 == 0);
59 // Ensure w and h are multiples of 8.
60 let w = (w + 7) / 8 * 8;
63 let chunk_size = h / WORKERS;
65 // Account for remainders in workload division, e.g. 1000 / 16 = 62.5
66 let last_chunk_size = if h % WORKERS != 0 {
67 chunk_size + h % WORKERS
73 let inverse_w_doubled = 2.0 / w as f64;
74 let inverse_h_doubled = 2.0 / h as f64;
75 let v_inverses = f64x2(inverse_w_doubled, inverse_h_doubled);
76 let v_consts = f64x2(1.5, 1.0);
78 // A lot of this code assumes this (so do other lang benchmarks)
80 let mut precalc_r = Vec::with_capacity(w);
81 let mut precalc_i = Vec::with_capacity(h);
83 let precalc_futures = (0..WORKERS).map(|i| {
84 Thread::scoped(move|| {
85 let mut rs = Vec::with_capacity(w / WORKERS);
86 let mut is = Vec::with_capacity(w / WORKERS);
88 let start = i * chunk_size;
89 let end = if i == (WORKERS - 1) {
90 start + last_chunk_size
95 // This assumes w == h
98 let xy = f64x2(xf, xf);
100 let f64x2(r, i) = xy * v_inverses - v_consts;
107 }).collect::<Vec<_>>();
109 for res in precalc_futures {
110 let (rs, is) = res.join().ok().unwrap();
111 precalc_r.extend(rs.into_iter());
112 precalc_i.extend(is.into_iter());
115 assert_eq!(precalc_r.len(), w);
116 assert_eq!(precalc_i.len(), h);
118 let arc_init_r = Arc::new(precalc_r);
119 let arc_init_i = Arc::new(precalc_i);
121 let data = (0..WORKERS).map(|i| {
122 let vec_init_r = arc_init_r.clone();
123 let vec_init_i = arc_init_i.clone();
125 Thread::scoped(move|| {
126 let mut res: Vec<u8> = Vec::with_capacity((chunk_size * w) / 8);
127 let init_r_slice = vec_init_r.as_slice();
129 let start = i * chunk_size;
130 let end = if i == (WORKERS - 1) {
131 start + last_chunk_size
136 for &init_i in &vec_init_i[start..end] {
137 write_line(init_i, init_r_slice, &mut res);
142 }).collect::<Vec<_>>();
144 try!(writeln!(&mut out as &mut Writer, "P4\n{} {}", w, h));
146 try!(out.write(res.join().ok().unwrap().as_slice()));
151 fn write_line(init_i: f64, vec_init_r: &[f64], res: &mut Vec<u8>) {
152 let v_init_i : f64x2 = f64x2(init_i, init_i);
153 let v_2 : f64x2 = f64x2(2.0, 2.0);
154 const LIMIT_SQUARED: f64 = LIMIT * LIMIT;
156 for chunk_init_r in vec_init_r.chunks(8) {
157 let mut cur_byte = 0xff;
161 let v_init_r = f64x2(chunk_init_r[i], chunk_init_r[i + 1]);
162 let mut cur_r = v_init_r;
163 let mut cur_i = v_init_i;
164 let mut r_sq = v_init_r * v_init_r;
165 let mut i_sq = v_init_i * v_init_i;
172 cur_i = v_2 * r * i + v_init_i;
173 cur_r = r_sq - i_sq + v_init_r;
175 let f64x2(bit1, bit2) = r_sq + i_sq;
177 if bit1 > LIMIT_SQUARED {
182 if bit2 > LIMIT_SQUARED {
187 r_sq = cur_r * cur_r;
188 i_sq = cur_i * cur_i;
191 cur_byte = (cur_byte << 2) + b;
195 res.push(cur_byte^-1);
200 let args = os::args();
201 let res = if args.len() < 2 {
202 println!("Test mode: do not dump the image because it's not utf8, \
203 which interferes with the test runner.");
204 mandelbrot(1000, old_io::util::NullWriter)
206 mandelbrot(args[1].parse().unwrap(), old_io::stdout())