1 files changed, 98 insertions, 0 deletions
diff --git a/third_party/rust/fastrand/benches/bench.rs b/third_party/rust/fastrand/benches/bench.rs
new file mode 100644
index 0000000000..4b882b74f9
--- /dev/null
+++ b/third_party/rust/fastrand/benches/bench.rs
@@ -0,0 +1,98 @@
+#![feature(test)]
+
+extern crate test;
+
+use rand::prelude::*;
+use test::Bencher;
+use wyhash::WyRng;
+
+#[bench]
+fn shuffle_wyhash(b: &mut Bencher) {
+    let mut rng = WyRng::from_rng(thread_rng()).unwrap();
+    let mut x = (0..100).collect::<Vec<usize>>();
+    b.iter(|| {
+        x.shuffle(&mut rng);
+        x[0]
+    })
+}
+
+#[bench]
+fn shuffle_fastrand(b: &mut Bencher) {
+    let rng = fastrand::Rng::new();
+    let mut x = (0..100).collect::<Vec<usize>>();
+    b.iter(|| {
+        rng.shuffle(&mut x);
+        x[0]
+    })
+}
+
+#[bench]
+fn u8_wyhash(b: &mut Bencher) {
+    let mut rng = WyRng::from_rng(thread_rng()).unwrap();
+    b.iter(|| {
+        let mut sum = 0u8;
+        for _ in 0..10_000 {
+            sum = sum.wrapping_add(rng.gen::<u8>());
+        }
+        sum
+    })
+}
+
+#[bench]
+fn u8_fastrand(b: &mut Bencher) {
+    let rng = fastrand::Rng::new();
+    b.iter(|| {
+        let mut sum = 0u8;
+        for _ in 0..10_000 {
+            sum = sum.wrapping_add(rng.u8(..));
+        }
+        sum
+    })
+}
+
+#[bench]
+fn u32_wyhash(b: &mut Bencher) {
+    let mut rng = WyRng::from_rng(thread_rng()).unwrap();
+    b.iter(|| {
+        let mut sum = 0u32;
+        for _ in 0..10_000 {
+            sum = sum.wrapping_add(rng.gen::<u32>());
+        }
+        sum
+    })
+}
+
+#[bench]
+fn u32_fastrand(b: &mut Bencher) {
+    let rng = fastrand::Rng::new();
+    b.iter(|| {
+        let mut sum = 0u32;
+        for _ in 0..10_000 {
+            sum = sum.wrapping_add(rng.u32(..));
+        }
+        sum
+    })
+}
+
+#[bench]
+fn fill(b: &mut Bencher) {
+    let rng = fastrand::Rng::new();
+    b.iter(|| {
+        // Pick a size that isn't divisble by 8.
+        let mut bytes = [0u8; 367];
+        rng.fill(&mut bytes);
+        bytes
+    })
+}
+
+#[bench]
+fn fill_naive(b: &mut Bencher) {
+    let rng = fastrand::Rng::new();
+    b.iter(|| {
+        let mut bytes = [0u8; 367];
+        for item in &mut bytes {
+            *item = rng.u8(..);
+        }
+        bytes
+    })
+}