use std::hash::{BuildHasher, Hash, Hasher}; use criterion::*; use fxhash::FxHasher; use ahash::{AHasher, CallHasher, RandomState}; fn gen_word_pairs() -> Vec { let words: Vec<_> = r#" a, ability, able, about, above, accept, according, account, across, act, action, activity, actually, add, address, administration, admit, adult, affect, after, again, against, age, agency, agent, ago, agree, agreement, ahead, air, all, allow, almost, alone, along, already, also, although, always, American, among, amount, analysis, and, animal, another, answer, any, anyone, anything, appear, apply, approach, area, argue, arm, around, arrive, art, article, artist, as, ask, assume, at, attack, attention, attorney, audience, author, authority, available, avoid, away, baby, back, bad, bag, ball, bank, bar, base, be, beat, beautiful, because, become, bed, before, begin, behavior, behind, believe, benefit, best, better, between, beyond, big, bill, billion, bit, black, blood, blue, board, body, book, born, both, box, boy, break, bring, brother, budget, build, building, business, but, buy, by, call, camera, campaign, can, cancer, candidate, capital, car, card, care, career, carry, case, catch, cause, cell, center, central, century, certain, certainly, chair, challenge, chance, change, character, charge, check, child, choice, choose, church, citizen, city, civil, claim, class, clear, clearly, close, coach, cold, collection, college, color, come, commercial, common, community, company, compare, computer, concern, condition, conference, Congress, consider, consumer, contain, continue, control, cost, could, country, couple, course, court, cover, create, crime, cultural, culture, cup, current, customer, cut, dark, data, daughter, day, dead, deal, death, debate, decade, decide, decision, deep, defense, degree, Democrat, democratic, describe, design, despite, detail, determine, develop, development, die, difference, different, difficult, dinner, direction, director, discover, discuss, discussion, disease, do, doctor, dog, door, down, draw, dream, drive, drop, drug, during, each, early, east, easy, eat, economic, economy, edge, education, effect, effort, eight, either, election, else, employee, end, energy, enjoy, enough, enter, entire, environment, environmental, especially, establish, even, evening, event, ever, every, everybody, everyone, everything, evidence, exactly, example, executive, exist, expect, experience, expert, explain, eye, face, fact, factor, fail, fall, family, far, fast, father, fear, federal, feel, feeling, few, field, fight, figure, fill, film, final, finally, financial, find, fine, finger, finish, fire, firm, first, fish, five, floor, fly, focus, follow, food, foot, for, force, foreign, forget, form, former, forward, four, free, friend, from, front, full, fund, future, game, garden, gas, general, generation, get, girl, give, glass, go, goal, good, government, great, green, ground, group, grow, growth, guess, gun, guy, hair, half, hand, hang, happen, happy, hard, have, he, head, health, hear, heart, heat, heavy, help, her, here, herself, high, him, himself, his, history, hit, hold, home, hope, hospital, hot, hotel, hour, house, how, however, huge, human, hundred, husband, I, idea, identify, if, image, imagine, impact, important, improve, in, include, including, increase, indeed, indicate, individual, industry, information, inside, instead, institution, interest, interesting, international, interview, into, investment, involve, issue, it, item, its, itself, job, join, just, keep, key, kid, kill, kind, kitchen, know, knowledge, land, language, large, last, late, later, laugh, law, lawyer, lay, lead, leader, learn, least, leave, left, leg, legal, less, let, letter, level, lie, life, light, like, likely, line, list, listen, little, live, local, long, look, lose, loss, lot, love, low, machine, magazine, main, maintain, major, majority, make, man, manage, management, manager, many, market, marriage, material, matter, may, maybe, me, mean, measure, media, medical, meet, meeting, member, memory, mention, message, method, middle, might, military, million, mind, minute, miss, mission, model, modern, moment, money, month, more, morning, most, mother, mouth, move, movement, movie, Mr, Mrs, much, music, must, my, myself, name, nation, national, natural, nature, near, nearly, necessary, need, network, never, new, news, newspaper, next, nice, night, no, none, nor, north, not, note, nothing, notice, now, n't, number, occur, of, off, offer, office, officer, official, often, oh, oil, ok, old, on, once, one, only, onto, open, operation, opportunity, option, or, order, organization, other, others, our, out, outside, over, own, owner, page, pain, painting, paper, parent, part, participant, particular, particularly, partner, party, pass, past, patient, pattern, pay, peace, people, per, perform, performance, perhaps, period, person, personal, phone, physical, pick, picture, piece, place, plan, plant, play, player, PM, point, police, policy, political, politics, poor, popular, population, position, positive, possible, power, practice, prepare, present, president, pressure, pretty, prevent, price, private, probably, problem, process, produce, product, production, professional, professor, program, project, property, protect, prove, provide, public, pull, purpose, push, put, quality, question, quickly, quite, race, radio, raise, range, rate, rather, reach, read, ready, real, reality, realize, really, reason, receive, recent, recently, recognize, record, red, reduce, reflect, region, relate, relationship, religious, remain, remember, remove, report, represent, Republican, require, research, resource, respond, response, responsibility, rest, result, return, reveal, rich, right, rise, risk, road, rock, role, room, rule, run, safe, same, save, say, scene, school, science, scientist, score, sea, season, seat, second, section, security, see, seek, seem, sell, send, senior, sense, series, serious, serve, service, set, seven, several, sex, sexual, shake, share, she, shoot, short, shot, should, shoulder, show, side, sign, significant, similar, simple, simply, since, sing, single, sister, sit, site, situation, six, size, skill, skin, small, smile, so, social, society, soldier, some, somebody, someone, something, sometimes, son, song, soon, sort, sound, source, south, southern, space, speak, special, specific, speech, spend, sport, spring, staff, stage, stand, standard, star, start, state, statement, station, stay, step, still, stock, stop, store, story, strategy, street, strong, structure, student, study, stuff, style, subject, success, successful, such, suddenly, suffer, suggest, summer, support, sure, surface, system, table, take, talk, task, tax, teach, teacher, team, technology, television, tell, ten, tend, term, test, than, thank, that, the, their, them, themselves, then, theory, there, these, they, thing, think, third, this, those, though, thought, thousand, threat, three, through, throughout, throw, thus, time, to, today, together, tonight, too, top, total, tough, toward, town, trade, traditional, training, travel, treat, treatment, tree, trial, trip, trouble, true, truth, try, turn, TV, two, type, under, understand, unit, until, up, upon, us, use, usually, value, various, very, victim, view, violence, visit, voice, vote, wait, walk, wall, want, war, watch, water, way, we, weapon, wear, week, weight, well, west, western, what, whatever, when, where, whether, which, while, white, who, whole, whom, whose, why, wide, wife, will, win, wind, window, wish, with, within, without, woman, wonder, word, work, worker, world, worry, would, write, writer, wrong, yard, yeah, year, yes, yet, you, young, your, yourself"# .split(',') .map(|word| word.trim()) .collect(); let mut word_pairs: Vec<_> = Vec::new(); for word in &words { for other_word in &words { word_pairs.push(word.to_string() + " " + other_word); } } assert_eq!(1_000_000, word_pairs.len()); word_pairs } #[allow(unused)] // False positive fn test_hash_common_words(build_hasher: &B) { let word_pairs: Vec<_> = gen_word_pairs(); check_for_collisions(build_hasher, &word_pairs, 32); } #[allow(unused)] // False positive fn check_for_collisions(build_hasher: &B, items: &[H], bucket_count: usize) { let mut buckets = vec![0; bucket_count]; for item in items { let value = hash(item, build_hasher) as usize; buckets[value % bucket_count] += 1; } let mean = items.len() / bucket_count; let max = *buckets.iter().max().unwrap(); let min = *buckets.iter().min().unwrap(); assert!( (min as f64) > (mean as f64) * 0.95, "min: {}, max:{}, {:?}", min, max, buckets ); assert!( (max as f64) < (mean as f64) * 1.05, "min: {}, max:{}, {:?}", min, max, buckets ); } #[allow(unused)] // False positive fn hash(b: &H, build_hasher: &B) -> u64 { H::get_hash(b, build_hasher) } #[test] fn test_bucket_distribution() { let build_hasher = RandomState::with_seeds(1, 2, 3, 4); test_hash_common_words(&build_hasher); let sequence: Vec<_> = (0..320000).collect(); check_for_collisions(&build_hasher, &sequence, 32); let sequence: Vec<_> = (0..2560000).collect(); check_for_collisions(&build_hasher, &sequence, 256); let sequence: Vec<_> = (0..320000).map(|i| i * 1024).collect(); check_for_collisions(&build_hasher, &sequence, 32); let sequence: Vec<_> = (0..2560000_u64).map(|i| i * 1024).collect(); check_for_collisions(&build_hasher, &sequence, 256); } fn ahash_vec(b: &Vec) -> u64 { let mut total: u64 = 0; for item in b { let mut hasher = AHasher::new_with_keys(1234, 5678); item.hash(&mut hasher); total = total.wrapping_add(hasher.finish()); } total } fn fxhash_vec(b: &Vec) -> u64 { let mut total: u64 = 0; for item in b { let mut hasher = FxHasher::default(); item.hash(&mut hasher); total = total.wrapping_add(hasher.finish()); } total } fn bench_ahash_words(c: &mut Criterion) { let words = gen_word_pairs(); c.bench_function("aes_words", |b| b.iter(|| black_box(ahash_vec(&words)))); } fn bench_fx_words(c: &mut Criterion) { let words = gen_word_pairs(); c.bench_function("fx_words", |b| b.iter(|| black_box(fxhash_vec(&words)))); } criterion_main!(benches); criterion_group!(benches, bench_ahash_words, bench_fx_words,);