PaperMC/patches/server/0131-Make-targetSize-more-aggressive-in-the-chunk-unload-.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Brokkonaut <hannos17@gmx.de>
Date: Tue, 7 Feb 2017 16:55:35 -0600
Subject: [PATCH] Make targetSize more aggressive in the chunk unload queue


diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index da97afe93a98daac33f143c6da0b42f71db25dba..5a80ea6bee72921454fbbd6ee202dc114c481ea1 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -185,7 +185,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         this.playerMap = new PlayerMap();
         this.entityMap = new Int2ObjectOpenHashMap();
         this.chunkTypeCache = new Long2ByteOpenHashMap();
-        this.unloadQueue = Queues.newConcurrentLinkedQueue();
+        this.unloadQueue = new com.destroystokyo.paper.utils.CachedSizeConcurrentLinkedQueue<>(); // Paper - need constant-time size()
         this.structureManager = structureManager;
         this.storageFolder = session.getDimensionPath(world.dimension());
         this.level = world;
@@ -478,7 +478,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         // Spigot start
         org.spigotmc.SlackActivityAccountant activityAccountant = this.level.getServer().slackActivityAccountant;
         activityAccountant.startActivity(0.5);
-        int targetSize = (int) (this.toDrop.size() * ChunkMap.UNLOAD_QUEUE_RESIZE_FACTOR);
+        int targetSize = Math.min(this.toDrop.size() - 100,  (int) (this.toDrop.size() * ChunkMap.UNLOAD_QUEUE_RESIZE_FACTOR)); // Paper - Make more aggressive
         // Spigot end
         while (longiterator.hasNext()) { // Spigot
             long j = longiterator.nextLong();
@@ -500,7 +500,8 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
 
         Runnable runnable;
 
-        while ((shouldKeepTicking.getAsBoolean() || this.unloadQueue.size() > 2000) && (runnable = (Runnable) this.unloadQueue.poll()) != null) {
+        int queueTarget = Math.min(this.unloadQueue.size() - 100, (int) (this.unloadQueue.size() * UNLOAD_QUEUE_RESIZE_FACTOR)); // Paper - Target this queue as well
+        while ((shouldKeepTicking.getAsBoolean() || this.unloadQueue.size() > queueTarget) && (runnable = (Runnable)this.unloadQueue.poll()) != null) { // Paper - Target this queue as well
             runnable.run();
         }