rlnc 0.3.0

Random Linear Network Coding
Documentation 
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use rand::Rng;
use rlnc::{
    RLNCError,
    full::{decoder::Decoder, encoder::Encoder},
};
use std::{fmt::Debug, time::Duration};

#[global_allocator]
static ALLOC: divan::AllocProfiler = divan::AllocProfiler::system();

fn main() {
    divan::Divan::default().bytes_format(divan::counter::BytesFormat::Binary).main();
}

struct RLNCConfig {
    data_byte_len: usize,
    piece_count: usize,
}

fn bytes_to_human_readable(bytes: usize) -> String {
    let units = ["B", "KB", "MB", "GB", "TB"];
    let mut bytes = bytes as f64;
    let mut unit_index = 0;

    while bytes >= 1024.0 && unit_index < units.len() - 1 {
        bytes /= 1024.0;
        unit_index += 1;
    }

    format!("{:.2} {}", bytes, units[unit_index])
}

impl Debug for RLNCConfig {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(&format!(
            "{} data splitted into {} pieces",
            &bytes_to_human_readable(self.data_byte_len),
            self.piece_count
        ))
    }
}

const ARGS: &[RLNCConfig] = &[
    RLNCConfig {
        data_byte_len: 1usize << 20,
        piece_count: 1usize << 4,
    },
    RLNCConfig {
        data_byte_len: 1usize << 20,
        piece_count: 1usize << 5,
    },
    RLNCConfig {
        data_byte_len: 1usize << 20,
        piece_count: 1usize << 6,
    },
    RLNCConfig {
        data_byte_len: 1usize << 20,
        piece_count: 1usize << 7,
    },
    RLNCConfig {
        data_byte_len: 1usize << 20,
        piece_count: 1usize << 8,
    },
    RLNCConfig {
        data_byte_len: 1usize << 24,
        piece_count: 1usize << 4,
    },
    RLNCConfig {
        data_byte_len: 1usize << 24,
        piece_count: 1usize << 5,
    },
    RLNCConfig {
        data_byte_len: 1usize << 24,
        piece_count: 1usize << 6,
    },
    RLNCConfig {
        data_byte_len: 1usize << 24,
        piece_count: 1usize << 7,
    },
    RLNCConfig {
        data_byte_len: 1usize << 24,
        piece_count: 1usize << 8,
    },
    RLNCConfig {
        data_byte_len: 1usize << 25,
        piece_count: 1usize << 4,
    },
    RLNCConfig {
        data_byte_len: 1usize << 25,
        piece_count: 1usize << 5,
    },
    RLNCConfig {
        data_byte_len: 1usize << 25,
        piece_count: 1usize << 6,
    },
    RLNCConfig {
        data_byte_len: 1usize << 25,
        piece_count: 1usize << 7,
    },
    RLNCConfig {
        data_byte_len: 1usize << 25,
        piece_count: 1usize << 8,
    },
];

#[divan::bench(args = ARGS, max_time = Duration::from_secs(100), skip_ext_time = true)]
fn decode(bencher: divan::Bencher, rlnc_config: &RLNCConfig) {
    let mut rng = rand::rng();

    let data = (0..rlnc_config.data_byte_len).map(|_| rng.random()).collect::<Vec<u8>>();
    let encoder = Encoder::new(data, rlnc_config.piece_count).expect("Failed to create RLNC encoder");

    let num_pieces_to_produce = rlnc_config.piece_count * 2;
    let coded_pieces = (0..num_pieces_to_produce).flat_map(|_| encoder.code(&mut rng)).collect::<Vec<u8>>();

    bencher
        .with_inputs(|| Decoder::new(encoder.get_piece_byte_len(), encoder.get_piece_count()).expect("Failed to create RLNC decoder"))
        .input_counter(|decoder| divan::counter::BytesCount::new(decoder.get_full_coded_piece_byte_len() * decoder.get_num_pieces_coded_together()))
        .bench_refs(|mut decoder| {
            let mut piece_index = 0;
            let per_piece_byte_len = coded_pieces.len() / num_pieces_to_produce;

            while piece_index < num_pieces_to_produce {
                let coded_piece_begins_at = piece_index * per_piece_byte_len;
                let coded_piece_ends_at = coded_piece_begins_at + per_piece_byte_len;
                let coded_piece = &coded_pieces[coded_piece_begins_at..coded_piece_ends_at];

                match divan::black_box(&mut decoder).decode(divan::black_box(coded_piece)) {
                    Ok(_) => {}
                    Err(e) => {
                        if let RLNCError::ReceivedAllPieces = e {
                            break;
                        }
                    }
                };

                piece_index += 1;
            }
        });
}