├── .gitignore ├── Cargo.lock ├── Cargo.toml ├── LICENSE ├── README.md ├── rustfmt.toml └── src ├── 1brc.rs └── gen-examples.rs /.gitignore: -------------------------------------------------------------------------------- 1 | target/ 2 | -------------------------------------------------------------------------------- /Cargo.lock: -------------------------------------------------------------------------------- 1 | # This file is automatically @generated by Cargo. 2 | # It is not intended for manual editing. 3 | version = 3 4 | 5 | [[package]] 6 | name = "autocfg" 7 | version = "1.1.0" 8 | source = "registry+https://github.com/rust-lang/crates.io-index" 9 | checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa" 10 | 11 | [[package]] 12 | name = "bstr" 13 | version = "1.9.0" 14 | source = "registry+https://github.com/rust-lang/crates.io-index" 15 | checksum = "c48f0051a4b4c5e0b6d365cd04af53aeaa209e3cc15ec2cdb69e73cc87fbd0dc" 16 | dependencies = [ 17 | "memchr", 18 | 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It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /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 | --------------------------------------------------------------------------------