Paper/Spigot-Server-Patches/0087-Optimize-Chunk-Access.patch

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From 4f5d96217a3ec5d72b3f19f874b53fd13d506b97 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 27 Aug 2015 01:15:02 -0400
Subject: [PATCH] Optimize Chunk Access
getting a loaded chunk is one of the most hottest pieces of code in the game.
getChunkAt is called for the same chunk multiple times in a row, often from getType();
Optimize this look up by using a Last Access cache.
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 4e7e8e5fd..1771a1794 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
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@@ -27,7 +27,27 @@ public class ChunkProviderServer implements IChunkProvider {
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public final Set<Long> unloadQueue = Sets.newHashSet();
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public final ChunkGenerator chunkGenerator;
private final IChunkLoader chunkLoader;
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- public final Long2ObjectMap<Chunk> chunks = new Long2ObjectOpenHashMap(8192);
+ // Paper start
+ protected Chunk lastChunkByPos = null;
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+ public Long2ObjectOpenHashMap<Chunk> chunks = new Long2ObjectOpenHashMap<Chunk>(8192) {
+
+ @Override
+ public Chunk get(long key) {
+ if (lastChunkByPos != null && key == lastChunkByPos.chunkKey) {
+ return lastChunkByPos;
+ }
+ return lastChunkByPos = super.get(key);
+ }
+
+ @Override
+ public Chunk remove(long key) {
+ if (lastChunkByPos != null && key == lastChunkByPos.chunkKey) {
+ lastChunkByPos = null;
+ }
+ return super.remove(key);
+ }
+ }; // CraftBukkit
+ // Paper end
public final WorldServer world;
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public ChunkProviderServer(WorldServer worldserver, IChunkLoader ichunkloader, ChunkGenerator chunkgenerator) {
--
2.18.0