performance measurements

Each table row shows performance measurements for this Rust program with a particular command-line input value N.

 N  CPU secs Elapsed secs Memory KB Code B ≈ CPU Load
120.040.04?791  25% 50% 60% 50%
160.680.221,644791  70% 77% 91% 83%
2014.974.01121,428791  92% 94% 94% 96%

Read the ↓ make, command line, and program output logs to see how this program was run.

Read binary-trees benchmark to see what this program should do.

 notes

rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)

 binary-trees Rust program source code

// The Computer Language Benchmarks Game
// http://benchmarksgame.alioth.debian.org/
//
// contributed by the Rust Project Developers
// contributed by TeXitoi

extern crate typed_arena;

use std::thread;
use typed_arena::Arena;

struct Tree<'a> {
    l: Option<&'a Tree<'a>>,
    r: Option<&'a Tree<'a>>,
    i: i32
}

fn item_check(t: &Option<&Tree>) -> i32 {
    match *t {
        None => 0,
        Some(&Tree { ref l, ref r, i }) => i + item_check(l) - item_check(r)
    }
}

fn bottom_up_tree<'r>(arena: &'r Arena<Tree<'r>>, item: i32, depth: i32)
                  -> Option<&'r Tree<'r>> {
    if depth > 0 {
        let t: &Tree<'r> = arena.alloc(Tree {
            l: bottom_up_tree(arena, 2 * item - 1, depth - 1),
            r: bottom_up_tree(arena, 2 * item, depth - 1),
            i: item
        });
        Some(t)
    } else {
        None
    }
}

fn inner(depth: i32, iterations: i32) -> String {
    let mut chk = 0;
    for i in 1 .. iterations + 1 {
        let arena = Arena::new();
        let a = bottom_up_tree(&arena, i, depth);
        let b = bottom_up_tree(&arena, -i, depth);
        chk += item_check(&a) + item_check(&b);
    }
    format!("{}\t trees of depth {}\t check: {}",
            iterations * 2, depth, chk)
}

fn main() {
    let n = std::env::args_os().nth(1)
        .and_then(|s| s.into_string().ok())
        .and_then(|n| n.parse().ok())
        .unwrap_or(10);
    let min_depth = 4;
    let max_depth = if min_depth + 2 > n {min_depth + 2} else {n};

    {
        let arena = Arena::new();
        let depth = max_depth + 1;
        let tree = bottom_up_tree(&arena, 0, depth);

        println!("stretch tree of depth {}\t check: {}",
                 depth, item_check(&tree));
    }

    let long_lived_arena = Arena::new();
    let long_lived_tree = bottom_up_tree(&long_lived_arena, 0, max_depth);

    let messages = (min_depth..max_depth + 1).filter(|&d| d % 2 == 0).map(|depth| {
        let iterations = 1 << ((max_depth - depth + min_depth) as u32);
        thread::spawn(move || inner(depth, iterations))
    }).collect::<Vec<_>>();

    for message in messages.into_iter() {
        println!("{}", message.join().unwrap());
    }

    println!("long lived tree of depth {}\t check: {}",
             max_depth, item_check(&long_lived_tree));
}

 make, command-line, and program output logs

Fri, 15 May 2015 23:48:00 GMT

MAKE:
/usr/local/src/rust-1.0.0-x86_64-unknown-linux-gnu/rustc/bin/rustc -C opt-level=3 -C target-cpu=core2 -C lto -L /usr/local/src/rust_lib binarytrees.rs -o binarytrees.rust_run
rm binarytrees.rs
7.12s to complete and log all make actions

COMMAND LINE:
./binarytrees.rust_run 20

PROGRAM OUTPUT:
stretch tree of depth 21	 check: -1
2097152	 trees of depth 4	 check: -2097152
524288	 trees of depth 6	 check: -524288
131072	 trees of depth 8	 check: -131072
32768	 trees of depth 10	 check: -32768
8192	 trees of depth 12	 check: -8192
2048	 trees of depth 14	 check: -2048
512	 trees of depth 16	 check: -512
128	 trees of depth 18	 check: -128
32	 trees of depth 20	 check: -32
long lived tree of depth 20	 check: -1

Revised BSD license

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