runtime: use Vec::with_capacity when building runtime (#4553)

tokio-rs · Mar 2, 2022 · fb9a01b · fb9a01b
1 parent 6f9a586
commit fb9a01b
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs
@@ -194,9 +194,9 @@ pub(super) fn create(
     before_park: Option<Callback>,
     after_unpark: Option<Callback>,
 ) -> (Arc<Shared>, Launch) {
-    let mut cores = vec![];
-    let mut remotes = vec![];
-    let mut worker_metrics = vec![];
+    let mut cores = Vec::with_capacity(size);
+    let mut remotes = Vec::with_capacity(size);
+    let mut worker_metrics = Vec::with_capacity(size);
 
     // Create the local queues
     for _ in 0..size {