From fb9a01b3628bdd78efd5561f54e1af4b6b2fa4f7 Mon Sep 17 00:00:00 2001
From: Alex Saveau <saveau.alexandre@gmail.com>
Date: Wed, 2 Mar 2022 03:41:43 -0800
Subject: [PATCH] runtime: use `Vec::with_capacity` when building runtime
 (#4553)

---
 tokio/src/runtime/thread_pool/worker.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs
index 7e4989701..5cd2eb791 100644
--- 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 {