std_rwlock and dashmap benches.

Cargo.toml

@@ -15,6 +15,18 @@ categories = ["concurrency", "algorithms", "data-structures"]
 [features]
 nightly = ["parking_lot/nightly", "dashmap-shard/nightly"]
 
+[dev-dependencies]
+criterion = "0.3"
+rayon = "1.2.0"
+
+[[bench]]
+name = "rwlock_std"
+harness = false
+
+[[bench]]
+name = "dashmap"
+harness = false
+
 [dependencies]
 dashmap-shard = { version = "0.1.1", default-features = false }
 parking_lot = "0.9.0"

benches/dashmap.rs

@@ -0,0 +1,31 @@
+use criterion::{criterion_group, criterion_main, Criterion, BenchmarkId, Throughput};
+use rayon::prelude::*;
+use dashmap::DashMap;
+
+const ITER: u64 = 32 * 1024;
+
+fn task_insert_dashmap_u64_u64() -> DashMap<u64, u64> {
+    let map = DashMap::new();
+    (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();
+}
+
+criterion_group!(benches, insert_dashmap_u64_u64);
+criterion_main!(benches);

benches/rwlock_std.rs

@@ -0,0 +1,32 @@
+use criterion::{criterion_group, criterion_main, Criterion, BenchmarkId, Throughput};
+use rayon::prelude::*;
+use std::collections::HashMap;
+use std::sync::RwLock;
+
+const ITER: u64 = 2 * 1024;
+
+fn task_insert_rwlock_std_u64_u64() -> RwLock<HashMap<u64, u64>> {
+    let map = RwLock::new(HashMap::new());
+    (0..ITER).into_par_iter().for_each(|i| {
+        map.write().unwrap().insert(i, i + 7);
+    });
+    map
+}
+
+fn insert_rwlock_std_u64_u64(c: &mut Criterion) {
+    let mut group = c.benchmark_group("insert_rwlock_std_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_rwlock_std_u64_u64()));
+        });
+    }
+
+    group.finish();
+}
+
+criterion_group!(benches, insert_rwlock_std_u64_u64);
+criterion_main!(benches);

src/lib.rs

@@ -14,7 +14,7 @@ use std::hash::{BuildHasher, Hash, Hasher};
 use t::Map;
 
 fn shard_amount() -> usize {
-    (num_cpus::get() * 4).next_power_of_two()
+    (num_cpus::get() * 32).next_power_of_two()
 }
 
 fn ncb(shard_amount: usize) -> usize {