Add benchmarks for fisher_yates_shuffle

eth2/utils/fisher_yates_shuffle/Cargo.toml

@@ -4,8 +4,13 @@ version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2018"
 
-[dependencies]
-hashing = { path = "../hashing" }
+[[bench]]
+name = "benches"
+harness = false
 
 [dev-dependencies]
+criterion = "0.2"
 yaml-rust = "0.4.2"
+
+[dependencies]
+hashing = { path = "../hashing" }

eth2/utils/fisher_yates_shuffle/benches/benches.rs

@@ -0,0 +1,55 @@
+use criterion::Criterion;
+use criterion::{black_box, criterion_group, criterion_main, Benchmark};
+use fisher_yates_shuffle::shuffle;
+
+fn get_list(n: usize) -> Vec<usize> {
+    let mut list = Vec::with_capacity(n);
+    for i in 0..n {
+        list.push(i)
+    }
+    assert_eq!(list.len(), n);
+    list
+}
+
+fn shuffles(c: &mut Criterion) {
+    c.bench(
+        "whole list shuffle",
+        Benchmark::new("8 elements", move |b| {
+            let seed = vec![42; 32];
+            let list = get_list(8);
+            b.iter_with_setup(|| list.clone(), |list| black_box(shuffle(&seed, list)))
+        }),
+    );
+
+    c.bench(
+        "whole list shuffle",
+        Benchmark::new("16 elements", move |b| {
+            let seed = vec![42; 32];
+            let list = get_list(16);
+            b.iter_with_setup(|| list.clone(), |list| black_box(shuffle(&seed, list)))
+        }),
+    );
+
+    c.bench(
+        "whole list shuffle",
+        Benchmark::new("512 elements", move |b| {
+            let seed = vec![42; 32];
+            let list = get_list(512);
+            b.iter_with_setup(|| list.clone(), |list| black_box(shuffle(&seed, list)))
+        })
+        .sample_size(10),
+    );
+
+    c.bench(
+        "whole list shuffle",
+        Benchmark::new("16384 elements", move |b| {
+            let seed = vec![42; 32];
+            let list = get_list(16_384);
+            b.iter_with_setup(|| list.clone(), |list| black_box(shuffle(&seed, list)))
+        })
+        .sample_size(10),
+    );
+}
+
+criterion_group!(benches, shuffles);
+criterion_main!(benches);