From 65964017c1b721ce29cef198e7146981de602284 Mon Sep 17 00:00:00 2001
From: fakeshadow <24548779@qq.com>
Date: Thu, 4 Feb 2021 22:45:06 +0800
Subject: [PATCH] reduce default max blocking thread count for each worker to
 512 / core count

---
 actix-server/src/worker.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/actix-server/src/worker.rs b/actix-server/src/worker.rs
index 9d6d9fa5..defc7306 100644
--- a/actix-server/src/worker.rs
+++ b/actix-server/src/worker.rs
@@ -168,10 +168,11 @@ pub(crate) struct ServerWorkerConfig {
 
 impl Default for ServerWorkerConfig {
     fn default() -> Self {
+        // 512 is the default max blocking thread count of tokio runtime.
+        let max_blocking_threads = std::cmp::max(512 / num_cpus::get(), 1);
         Self {
             shutdown_timeout: Duration::from_secs(30),
-            // default max_blocking_threads is the same as tokio's default
-            max_blocking_threads: 512,
+            max_blocking_threads,
         }
     }
 }