├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── LICENSE
├── README.md
├── rustfmt.toml
└── src
├── 1brc.rs
└── gen-examples.rs
/.gitignore:
--------------------------------------------------------------------------------
1 | target/
2 |
--------------------------------------------------------------------------------
/Cargo.lock:
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/LICENSE:
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # 1BRC: One Billion Row Challenge in Rust
2 |
3 | ## Creating the measurements file with 1B rows
4 |
5 | First, the generator has to be build.
6 | ```shell
7 | cargo build --bin gen-examples --features=random --release
8 | ```
9 |
10 | Then, the generator can be run to create the measurements file.
11 | ```shell
12 | cargo run --bin gen-examples --features=random --release -- > measurements.txt
13 | ```
14 |
15 | Be patient as it can take more than a minute to have the file generated.
16 |
--------------------------------------------------------------------------------
/rustfmt.toml:
--------------------------------------------------------------------------------
1 | # The following options sound like good idea, but are disabled by default. If
2 | # they happen to interfere with something, they probably need to be disabled
3 | # again.
4 | use_field_init_shorthand = true
5 |
6 | # The following options sound very promising. Unfortunately, they are only
7 | # available on nightly, which we will not experiment with for now. Once they
8 | # stabilised, it would be nice to activate them.
9 | #
10 | # format_code_in_doc_comments = true
11 | # group_imports = "StdExternalCrate"
12 | # imports_granularity = "Crate"
13 | # imports_layout = "Vertical"
14 | # reorder_impl_items = true
15 |
16 | # On small screens, i.e. the 14" screens of Lenovo's ThinkPad T470p, 87 is the
17 | # maximum width to have two Vim buffers side by side. Now, Python's formatter
18 | # `black` uses 88 and that works well too. Going higher would impede usability
19 | # on small screens too much.
20 | max_width = 88
21 |
--------------------------------------------------------------------------------
/src/1brc.rs:
--------------------------------------------------------------------------------
1 | use bstr::{BStr, ByteSlice};
2 | use memmap::MmapOptions;
3 | use rustc_hash::FxHashMap as HashMap;
4 | use std::{fmt::Display, fs::File};
5 |
6 | use rayon::prelude::*;
7 |
8 | #[derive(Debug)]
9 | struct State {
10 | min: f64,
11 | max: f64,
12 | count: u64,
13 | sum: f64,
14 | }
15 |
16 | impl Default for State {
17 | fn default() -> Self {
18 | Self {
19 | min: f64::MAX,
20 | max: f64::MIN,
21 | count: 0,
22 | sum: 0.0,
23 | }
24 | }
25 | }
26 |
27 | impl Display for State {
28 | fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
29 | let avg = self.sum / (self.count as f64);
30 | write!(f, "{:.1}/{avg:.1}/{:.1}", self.min, self.max)
31 | }
32 | }
33 |
34 | impl State {
35 | fn update(&mut self, v: f64) {
36 | self.min = self.min.min(v);
37 | self.max = self.max.max(v);
38 | self.count += 1;
39 | self.sum += v;
40 | }
41 |
42 | fn merge(&mut self, other: &Self) {
43 | self.min = self.min.min(other.min);
44 | self.max = self.max.max(other.max);
45 | self.count += other.count;
46 | self.sum += other.sum;
47 | }
48 | }
49 |
50 | fn make_map<'a>(i: impl Iterator- ) -> HashMap<&'a BStr, State> {
51 | let mut state: HashMap<&'a BStr, State> = Default::default();
52 | for line in i {
53 | let (name, value) = line.split_once_str(&[b';']).unwrap();
54 | let value = fast_float::parse(value).unwrap();
55 | state.entry(name.into()).or_default().update(value);
56 | }
57 | state
58 | }
59 |
60 | fn solve_for_part((start, end): (usize, usize), mem: &[u8]) -> HashMap<&BStr, State> {
61 | make_map((&mem[start..end]).lines())
62 | }
63 |
64 | fn merge<'a>(a: &mut HashMap<&'a BStr, State>, b: &HashMap<&'a BStr, State>) {
65 | for (k, v) in b {
66 | a.entry(k).or_default().merge(v);
67 | }
68 | }
69 |
70 | fn main() {
71 | let cores: usize = std::thread::available_parallelism().unwrap().into();
72 | let path = match std::env::args().skip(1).next() {
73 | Some(path) => path,
74 | None => "measurements.txt".to_owned(),
75 | };
76 | let file = File::open(path).unwrap();
77 | let mmap = unsafe { MmapOptions::new().map(&file).unwrap() };
78 |
79 | let chunk_size = mmap.len() / cores;
80 | let mut chunks: Vec<(usize, usize)> = vec![];
81 | let mut start = 0;
82 | for _ in 0..cores {
83 | let end = (start + chunk_size).min(mmap.len());
84 | let next_new_line = match memchr::memchr(b'\n', &mmap[end..]) {
85 | Some(v) => v,
86 | None => {
87 | assert_eq!(end, mmap.len());
88 | 0
89 | }
90 | };
91 | let end = end + next_new_line;
92 | chunks.push((start, end));
93 | start = end + 1;
94 | }
95 | let parts: Vec<_> = chunks
96 | .par_iter()
97 | .map(|r| solve_for_part(*r, &mmap))
98 | .collect();
99 |
100 | let state: HashMap<&BStr, State> =
101 | parts.into_iter().fold(Default::default(), |mut a, b| {
102 | merge(&mut a, &b);
103 | a
104 | });
105 |
106 | let mut all: Vec<_> = state.into_iter().collect();
107 | all.sort_unstable_by(|a, b| a.0.cmp(&b.0));
108 | print!("{{");
109 | for (i, (name, state)) in all.into_iter().enumerate() {
110 | if i == 0 {
111 | print!("{name}={state}");
112 | } else {
113 | print!(", {name}={state}");
114 | }
115 | }
116 | println!("}}");
117 | }
118 |
--------------------------------------------------------------------------------
/src/gen-examples.rs:
--------------------------------------------------------------------------------
1 | use std::collections::HashSet;
2 | use std::env;
3 |
4 | #[cfg(feature = "random")]
5 | use rand::{distributions::Alphanumeric, Rng};
6 |
7 | const MIN_VALUE: i32 = -999; // inclusive
8 | const MAX_VALUE: i32 = 999; // inclusive
9 | const MIN_CITY_NAME_LEN: usize = 1;
10 | const MAX_CITY_NAME_LEN: usize = 32; // inclusive
11 |
12 | fn get_city_name() -> String {
13 | // Sampling printable UTF8 characters would be overly complex. Therefore,
14 | // only ASCII characters are sampled.
15 | let city_name_len =
16 | rand::thread_rng().gen_range(MIN_CITY_NAME_LEN..=MAX_CITY_NAME_LEN);
17 | let city_name_bytes = (0..city_name_len)
18 | .map(|_| rand::thread_rng().sample(Alphanumeric))
19 | .collect::>();
20 | let city_name = String::from_utf8(city_name_bytes)
21 | .expect("Sampling ASCII characters must be valid UTF8");
22 | // Not all UTF8 characters use 4 bytes, so we need to truncate the string
23 | // to the actual length of the city name.
24 | city_name.to_string().chars().take(city_name_len).collect()
25 | }
26 |
27 | fn get_cities(nof_cities: u32) -> Vec {
28 | let mut cities = HashSet::new();
29 | for _ in 0..nof_cities {
30 | loop {
31 | let city_name = get_city_name();
32 | if city_name.contains(';') {
33 | continue;
34 | }
35 | if cities.insert(city_name) {
36 | break;
37 | }
38 | }
39 | }
40 | cities.into_iter().collect()
41 | }
42 |
43 | fn main() {
44 | let args: Vec = env::args().collect();
45 | let max_nof_cities: u32 = args[1].parse().unwrap();
46 | let nof_rows: u32 = args[2].parse().unwrap();
47 |
48 | let cities = get_cities(max_nof_cities);
49 | for _ in 0..nof_rows {
50 | let city_idx = rand::thread_rng().gen_range(0..cities.len());
51 | let value = rand::thread_rng().gen_range(MIN_VALUE..=MAX_VALUE);
52 | let value = f64::from(value) / 10.0;
53 | println!("{};{value:.1}", cities[city_idx]);
54 | }
55 | }
56 |
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