things

rust2/benches/opts.rs

@@ -0,0 +1,16 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+fn fibonacci(n: u64) -> u64 {
+    match n {
+        0 => 1,
+        1 => 1,
+        n => fibonacci(n - 1) + fibonacci(n - 2),
+    }
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    c.bench_function("fib 20", |b| b.iter(|| fibonacci(black_box(20))));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);