spigot/CraftBukkit-Patches/0031-Configurable-Amount-of-Netty-Threads.patch

From a3a107d826bb9114a4365c4b63df89560098a260 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Fri, 13 Dec 2013 11:58:58 +1100
Subject: [PATCH] Configurable Amount of Netty Threads

This brings back the option that the Spigot version of netty saw. By default Netty will try and use cores*2 threads, however if running multiple servers on the same machine, this can be too many threads. Additionally some people have 16 core servers. If 32 Netty threads are allowed in this setup, then the lock contention, and thus blocking between threads becomes much greater, leading to decreased performance.

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 977e2c6fa3..f8e553161e 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -336,7 +336,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
                 services.profileCache().setExecutor(this);
             }
 
-            this.connection = new ServerConnection(this);
+            // this.connection = new ServerConnection(this); // Spigot
             this.progressListenerFactory = worldloadlistenerfactory;
             this.storageSource = convertable_conversionsession;
             this.playerDataStorage = convertable_conversionsession.createPlayerStorage();
@@ -1597,7 +1597,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
     }
 
     public ServerConnection getConnection() {
-        return this.connection;
+        return this.connection == null ? this.connection = new ServerConnection(this) : this.connection; // Spigot
     }
 
     public boolean isReady() {
diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
index 3bb51f4528..c5989e8e9b 100644
--- a/src/main/java/org/spigotmc/SpigotConfig.java
+++ b/src/main/java/org/spigotmc/SpigotConfig.java
@@ -224,4 +224,11 @@ public class SpigotConfig
         }
         bungee = getBoolean( "settings.bungeecord", false );
     }
+
+    private static void nettyThreads()
+    {
+        int count = getInt( "settings.netty-threads", 4 );
+        System.setProperty( "io.netty.eventLoopThreads", Integer.toString( count ) );
+        Bukkit.getLogger().log( Level.INFO, "Using {0} threads for Netty based IO", count );
+    }
 }
-- 
2.42.0