dashmap 3.11.1

Blazing fast concurrent HashMap for Rust.
Documentation 
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use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
use dashmap::DashMap as DMF;
use fxhash::FxBuildHasher;
use rayon::prelude::*;

type DashMap<K, V> = DMF<K, V, FxBuildHasher>;

const ITER: u64 = 32 * 1024;

fn task_insert_dashmap_u64_u64() -> DashMap<u64, u64> {
    let map = DashMap::with_capacity_and_hasher(ITER as usize, FxBuildHasher::default());
    (0..ITER).into_par_iter().for_each(|i| {
        map.insert(i, i + 7);
    });
    map
}

fn insert_dashmap_u64_u64(c: &mut Criterion) {
    let mut group = c.benchmark_group("insert_dashmap_u64_u64");
    group.throughput(Throughput::Elements(ITER as u64));
    let max = num_cpus::get();

    for threads in &[1, max] {
        group.bench_with_input(
            BenchmarkId::from_parameter(threads),
            &threads,
            |b, &threads| {
                let pool = rayon::ThreadPoolBuilder::new()
                    .num_threads(*threads)
                    .build()
                    .unwrap();
                pool.install(|| b.iter(|| task_insert_dashmap_u64_u64()));
            },
        );
    }

    group.finish();
}

fn task_get_dashmap_u64_u64(map: &DashMap<u64, u64>) {
    (0..ITER).into_par_iter().for_each(|i| {
        assert_eq!(*map.get(&i).unwrap(), i + 7);
    });
}

fn get_dashmap_u64_u64(c: &mut Criterion) {
    let mut group = c.benchmark_group("get_dashmap_u64_u64");
    group.throughput(Throughput::Elements(ITER as u64));
    let max = num_cpus::get();

    for threads in &[1, max] {
        let map = task_insert_dashmap_u64_u64();

        group.bench_with_input(
            BenchmarkId::from_parameter(threads),
            &threads,
            |b, &threads| {
                let pool = rayon::ThreadPoolBuilder::new()
                    .num_threads(*threads)
                    .build()
                    .unwrap();
                pool.install(|| b.iter(|| task_get_dashmap_u64_u64(&map)));
            },
        );
    }

    group.finish();
}

criterion_group!(benches, insert_dashmap_u64_u64, get_dashmap_u64_u64);
criterion_main!(benches);