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measurement::Measurement, AxisScale, BenchmarkGroup, + BenchmarkId, Criterion, PlotConfiguration, +}; +use rand::{seq::SliceRandom, thread_rng, Rng}; + +const EXCEEDS_CPU_CACHE_LENGTH: usize = 92 * 1024 * 1024; + +#[derive(Debug)] +enum KeySizeType { + Fixed(usize), +} + +enum KeySizeGen { + Fixed(usize), +} + +pub struct OrdsearchLookup<'a> { + keys: ordsearch::OrderedCollection<&'a [u8]>, +} + +impl<'a> OrdsearchLookup<'a> { + fn new(keys: &[&'a [u8]]) -> Self { + let mut keys: Vec<&[u8]> = keys.into_iter().copied().collect(); + keys.sort_unstable(); + Self { + keys: ordsearch::OrderedCollection::from_sorted_iter(keys.iter().copied()), + } + } + + fn contains(&self, key: &[u8]) -> bool { + if let Some(k) = self.keys.find_gte(key) { + *k == key + } else { + eprintln!("Key not found"); + false + } + } +} + +fn lookup_benchmark<'b, M>( + keys: &[&'b [u8]], + group: &mut BenchmarkGroup<'_, M>, + bench_entry: (&str, OrdsearchLookup<'b>), + key_size: KeySizeType, +) where + M: Measurement, +{ + debug_assert!(keys.len() > 0); + + let (algorithm, key_lookup) = bench_entry; + + let num_keys = keys.len(); + + group.throughput(criterion::Throughput::Elements(num_keys as u64)); + + group.bench_with_input( + BenchmarkId::new( + algorithm, + match key_size { + KeySizeType::Fixed(key_size) => format!("{}/{}", num_keys, key_size), + }, + ), + &keys.len(), + |b, &_| { + b.iter(|| { + let start = std::time::Instant::now(); + for key in keys.iter().copied() { + black_box(key_lookup.contains(key)); + } + let elapsed = start.elapsed(); + eprintln!( + "\nTook {:?} or {} Kelements / s", + elapsed, + keys.len() as f64 / (1000f64 * elapsed.as_secs_f64()) + ); + }); + }, + ); +} + +fn make_keys<'a>(key_buffer: &'a [u8], mut key_size: KeySizeGen) -> Vec<&'a [u8]> { + let mut offset = 0; + let mut total_size_of_keys = 0; + let max_keys = 5_000_000; + let mut total_num_keys = 0; + let mut keys: Vec<&[u8]> = std::iter::from_fn(|| { + let key_size = match &mut key_size { + KeySizeGen::Fixed(key_size) => *key_size, + }; + + if total_num_keys >= max_keys + 10_000 || total_size_of_keys + key_size > key_buffer.len() { + return None; + } + + total_size_of_keys += key_size; + total_num_keys += 1; + + let key = unsafe { key_buffer.get_unchecked(offset..offset + key_size) }; + offset = (offset + key_size) % EXCEEDS_CPU_CACHE_LENGTH; + return Some(key); + }) + .collect(); + keys.sort_unstable(); + keys.dedup(); + if keys.len() > max_keys { + keys.drain(max_keys..); + } + keys.shuffle(&mut thread_rng()); + keys +} + +fn benchmark_lookups(c: &mut Criterion) { + // From testing, filters take roughly the same amount of time to create regardless of the fingerprint size. + // So no need to test each one to compare against other mechanisms. + let mut rng = rand::thread_rng(); + + let key_buffer = + Vec::from_iter(std::iter::from_fn(|| Some(rng.gen::())).take(EXCEEDS_CPU_CACHE_LENGTH)); + + let mut group = c.benchmark_group("Lookup Filter Fixed Keys"); + + group.plot_config(PlotConfiguration::default().summary_scale(AxisScale::Logarithmic)); + + for key_size in [5, 11, 20, 30] { + let keys = make_keys(&key_buffer, KeySizeGen::Fixed(key_size)); + + let bench_entry = ("ordsearch", OrdsearchLookup::new(&keys)); + + lookup_benchmark( + keys.as_slice(), + &mut group, + bench_entry, + KeySizeType::Fixed(key_size), + ); + } + + group.finish(); +} + +criterion_group!(benches, benchmark_lookups); +criterion_main!(benches);