From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. 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b/vendor/phf_generator/Cargo.toml new file mode 100644 index 000000000..53394ab30 --- /dev/null +++ b/vendor/phf_generator/Cargo.toml @@ -0,0 +1,40 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +edition = "2018" +name = "phf_generator" +version = "0.10.0" +authors = ["Steven Fackler "] +description = "PHF generation logic" +license = "MIT" +repository = "https://github.com/sfackler/rust-phf" + +[[bin]] +name = "gen_hash_test" +required-features = ["criterion"] + +[[bench]] +name = "benches" +harness = false +[dependencies.criterion] +version = "=0.3.4" +optional = true + +[dependencies.phf_shared] +version = "0.10.0" +default-features = false + +[dependencies.rand] +version = "0.8" +features = ["small_rng"] +[dev-dependencies.criterion] +version = "=0.3.4" diff --git a/vendor/phf_generator/benches/benches.rs b/vendor/phf_generator/benches/benches.rs new file mode 100644 index 000000000..179c8627b --- /dev/null +++ b/vendor/phf_generator/benches/benches.rs @@ -0,0 +1,58 @@ +use criterion::measurement::Measurement; +use criterion::{criterion_group, criterion_main, Bencher, BenchmarkId, Criterion}; + +use rand::distributions::Standard; +use rand::rngs::SmallRng; +use rand::{Rng, SeedableRng}; + +use phf_generator::generate_hash; + +fn gen_vec(len: usize) -> Vec { + SmallRng::seed_from_u64(0xAAAAAAAAAAAAAAAA) + .sample_iter(Standard) + .take(len) + .collect() +} + +fn bench_hash(b: &mut Bencher, len: &usize) { + let vec = gen_vec(*len); + b.iter(|| generate_hash(&vec)) +} + +fn gen_hash_small(c: &mut Criterion) { + let sizes = vec![0, 1, 2, 5, 10, 25, 50, 75]; + for size in &sizes { + c.bench_with_input(BenchmarkId::new("gen_hash_small", *size), size, bench_hash); + } +} + +fn gen_hash_med(c: &mut Criterion) { + let sizes = vec![100, 250, 500, 1000, 2500, 5000, 7500]; + for size in &sizes { + c.bench_with_input(BenchmarkId::new("gen_hash_medium", *size), size, bench_hash); + } +} + +fn gen_hash_large(c: &mut Criterion) { + let sizes = vec![10_000, 25_000, 50_000, 75_000]; + for size in &sizes { + c.bench_with_input(BenchmarkId::new("gen_hash_large", *size), size, bench_hash); + } +} + +fn gen_hash_xlarge(c: &mut Criterion) { + let sizes = vec![100_000, 250_000, 500_000, 750_000, 1_000_000]; + for size in &sizes { + c.bench_with_input(BenchmarkId::new("gen_hash_xlarge", *size), size, bench_hash); + } +} + +criterion_group!( + benches, + gen_hash_small, + gen_hash_med, + gen_hash_large, + gen_hash_xlarge +); + +criterion_main!(benches); diff --git a/vendor/phf_generator/src/bin/gen_hash_test.rs b/vendor/phf_generator/src/bin/gen_hash_test.rs new file mode 100644 index 000000000..2e1fbec45 --- /dev/null +++ b/vendor/phf_generator/src/bin/gen_hash_test.rs @@ -0,0 +1,20 @@ +use criterion::*; + +use rand::distributions::Alphanumeric; +use rand::rngs::SmallRng; +use rand::{Rng, SeedableRng}; + +use phf_generator::generate_hash; + +fn gen_vec(len: usize) -> Vec { + let mut rng = SmallRng::seed_from_u64(0xAAAAAAAAAAAAAAAA).sample_iter(Alphanumeric); + + (0..len) + .map(move |_| rng.by_ref().take(64).collect::()) + .collect() +} + +fn main() { + let data = black_box(gen_vec(1_000_000)); + black_box(generate_hash(&data)); +} diff --git a/vendor/phf_generator/src/lib.rs b/vendor/phf_generator/src/lib.rs new file mode 100644 index 000000000..6c848ce5a --- /dev/null +++ b/vendor/phf_generator/src/lib.rs @@ -0,0 +1,105 @@ +#![doc(html_root_url = "https://docs.rs/phf_generator/0.9")] +use phf_shared::{HashKey, PhfHash}; +use rand::distributions::Standard; +use rand::rngs::SmallRng; +use rand::{Rng, SeedableRng}; + +const DEFAULT_LAMBDA: usize = 5; + +const FIXED_SEED: u64 = 1234567890; + +pub struct HashState { + pub key: HashKey, + pub disps: Vec<(u32, u32)>, + pub map: Vec, +} + +pub fn generate_hash(entries: &[H]) -> HashState { + SmallRng::seed_from_u64(FIXED_SEED) + .sample_iter(Standard) + .find_map(|key| try_generate_hash(entries, key)) + .expect("failed to solve PHF") +} + +fn try_generate_hash(entries: &[H], key: HashKey) -> Option { + struct Bucket { + idx: usize, + keys: Vec, + } + + let hashes: Vec<_> = entries + .iter() + .map(|entry| phf_shared::hash(entry, &key)) + .collect(); + + let buckets_len = (hashes.len() + DEFAULT_LAMBDA - 1) / DEFAULT_LAMBDA; + let mut buckets = (0..buckets_len) + .map(|i| Bucket { + idx: i, + keys: vec![], + }) + .collect::>(); + + for (i, hash) in hashes.iter().enumerate() { + buckets[(hash.g % (buckets_len as u32)) as usize] + .keys + .push(i); + } + + // Sort descending + buckets.sort_by(|a, b| a.keys.len().cmp(&b.keys.len()).reverse()); + + let table_len = hashes.len(); + let mut map = vec![None; table_len]; + let mut disps = vec![(0u32, 0u32); buckets_len]; + + // store whether an element from the bucket being placed is + // located at a certain position, to allow for efficient overlap + // checks. It works by storing the generation in each cell and + // each new placement-attempt is a new generation, so you can tell + // if this is legitimately full by checking that the generations + // are equal. (A u64 is far too large to overflow in a reasonable + // time for current hardware.) + let mut try_map = vec![0u64; table_len]; + let mut generation = 0u64; + + // the actual values corresponding to the markers above, as + // (index, key) pairs, for adding to the main map once we've + // chosen the right disps. + let mut values_to_add = vec![]; + + 'buckets: for bucket in &buckets { + for d1 in 0..(table_len as u32) { + 'disps: for d2 in 0..(table_len as u32) { + values_to_add.clear(); + generation += 1; + + for &key in &bucket.keys { + let idx = (phf_shared::displace(hashes[key].f1, hashes[key].f2, d1, d2) + % (table_len as u32)) as usize; + if map[idx].is_some() || try_map[idx] == generation { + continue 'disps; + } + try_map[idx] = generation; + values_to_add.push((idx, key)); + } + + // We've picked a good set of disps + disps[bucket.idx] = (d1, d2); + for &(idx, key) in &values_to_add { + map[idx] = Some(key); + } + continue 'buckets; + } + } + + // Unable to find displacements for a bucket + return None; + } + + Some(HashState { + key, + disps, + map: map.into_iter().map(|i| i.unwrap()).collect(), + }) +} -- cgit v1.2.3