PaperMC/patches/server/0129-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 fb8d50dc14e1d23001e184b425bc6ac2f8b0f37e..f5cf71258732aa040443eb82e09ab28f130e4c79 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -226,8 +226,8 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         this.entityMap = new Int2ObjectOpenHashMap();
         this.chunkTypeCache = new Long2ByteOpenHashMap();
         this.chunkSaveCooldowns = new Long2LongOpenHashMap();
-        this.unloadQueue = Queues.newConcurrentLinkedQueue();
         this.structureManager = structureManager;
+        this.unloadQueue = new com.destroystokyo.paper.utils.CachedSizeConcurrentLinkedQueue<>(); // Paper - need constant-time size()
         Path path = session.getDimensionPath(world.dimension());
 
         this.storageName = path.getFileName().toString();
@@ -564,7 +564,6 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
 
     private void processUnloads(BooleanSupplier shouldKeepTicking) {
         LongIterator longiterator = this.toDrop.iterator();
-
         for (int i = 0; longiterator.hasNext() && (shouldKeepTicking.getAsBoolean() || i < 200 || this.toDrop.size() > 2000); longiterator.remove()) {
             long j = longiterator.nextLong();
             ChunkHolder playerchunk = (ChunkHolder) this.updatingChunkMap.remove(j);
@@ -577,7 +576,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
             }
         }
 
-        int k = Math.max(0, this.unloadQueue.size() - 2000);
+        int k = Math.max(100, this.unloadQueue.size() - 2000); // Paper - Unload more than just up to queue size 2000
 
         Runnable runnable;