p

Chapter09/performance_profiling2.rs

@@ -1,2 +1,24 @@
+use std::{thread,time};
+
+fn initialization() -> Vec<i32> {
+   let t = time::Duration::from_millis(15000);
+   thread::sleep(t);
+   println!("Initialize data.");
+   vec![1, 2, 3]
+}
+
+fn work(x: i32) -> i32 {
+   let t = time::Duration::from_millis(150);
+   thread::sleep(t);
+   println!("Work.");
+   x * x
+}
+
 fn main() {
+
+   for _ in 0..10 {
+      let data = initialization();
+      data.iter().map(|x| work(*x)).for_each(drop);
+   }
+   
 }