compressed-intvec 0.6.0

Space-efficient integer vectors with fixed-width, variable-length, and sequence-oriented encodings.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

// benches/bench_serde.rs
//
// Serde round-trip benchmarks for FixedVec, VarVec, and SeqVec.
// Run with: cargo bench --bench bench_serde --features serde

use std::time::Duration;

use compressed_intvec::prelude::*;
use criterion::{black_box, criterion_group, criterion_main, Criterion, Throughput};
use rand::{rngs::SmallRng, RngExt, SeedableRng};

/// Generates a vector with uniformly random values up to a given maximum.
fn generate_random_vec(size: usize, max_val_exclusive: u64) -> Vec<u64> {
    let mut rng = SmallRng::seed_from_u64(42);
    (0..size)
        .map(|_| rng.random_range(0..max_val_exclusive))
        .collect()
}

fn benchmark_serde(c: &mut Criterion) {
    const FIXED_SIZE: usize = 1_000_000;
    const VAR_SIZE: usize = 1_000_000;
    const SEQ_COUNT: usize = 50_000;
    const SEQ_LEN: usize = 20;

    // --- FixedVec serde benchmarks ---
    for &bit_width in &[16u32, 32] {
        let data = generate_random_vec(FIXED_SIZE, 1u64 << bit_width);
        let vec = LEFixedVec::builder()
            .bit_width(BitWidth::Explicit(bit_width as usize))
            .build(&data)
            .unwrap();

        let serialized = bincode::serialize(&vec).unwrap();
        let serialized_size = serialized.len() as u64;

        let mut group = c.benchmark_group(format!("Serde/FixedVec/{}bit", bit_width));
        group.throughput(Throughput::Bytes(serialized_size));

        group.bench_function("serialize", |b| {
            b.iter(|| {
                black_box(bincode::serialize(black_box(&vec)).unwrap());
            })
        });

        group.bench_function("deserialize", |b| {
            b.iter(|| {
                black_box(bincode::deserialize::<LEFixedVec>(black_box(&serialized)).unwrap());
            })
        });

        group.finish();
    }

    // --- VarVec serde benchmarks ---
    for (codec_name, codec) in &[("Gamma", Codec::Gamma), ("Delta", Codec::Delta)] {
        let data = generate_random_vec(VAR_SIZE, 1_000);
        let vec = LEVarVec::builder()
            .k(32)
            .codec(*codec)
            .build(&data)
            .unwrap();

        let serialized = bincode::serialize(&vec).unwrap();
        let serialized_size = serialized.len() as u64;

        let mut group = c.benchmark_group(format!("Serde/VarVec/{}", codec_name));
        group.throughput(Throughput::Bytes(serialized_size));

        group.bench_function("serialize", |b| {
            b.iter(|| {
                black_box(bincode::serialize(black_box(&vec)).unwrap());
            })
        });

        group.bench_function("deserialize", |b| {
            b.iter(|| {
                black_box(bincode::deserialize::<LEVarVec>(black_box(&serialized)).unwrap());
            })
        });

        group.finish();
    }

    // --- SeqVec serde benchmarks ---
    {
        let mut rng = SmallRng::seed_from_u64(42);
        let sequences: Vec<Vec<u64>> = (0..SEQ_COUNT)
            .map(|_| {
                (0..SEQ_LEN)
                    .map(|_| rng.random_range(0..1_000u64))
                    .collect()
            })
            .collect();

        let vec: LESeqVec<u64> = SeqVec::builder()
            .codec(Codec::Delta)
            .build(&sequences)
            .unwrap();

        let serialized = bincode::serialize(&vec).unwrap();
        let serialized_size = serialized.len() as u64;

        let mut group = c.benchmark_group("Serde/SeqVec/Delta");
        group.throughput(Throughput::Bytes(serialized_size));

        group.bench_function("serialize", |b| {
            b.iter(|| {
                black_box(bincode::serialize(black_box(&vec)).unwrap());
            })
        });

        group.bench_function("deserialize", |b| {
            b.iter(|| {
                black_box(
                    bincode::deserialize::<LESeqVec<u64>>(black_box(&serialized)).unwrap(),
                );
            })
        });

        group.finish();
    }
}

criterion_group! {
    name = benches;
    config = Criterion::default()
        .sample_size(50)
        .warm_up_time(Duration::from_millis(500))
        .measurement_time(Duration::from_secs(5));
    targets = benchmark_serde
}
criterion_main!(benches);