From 3ca522e3f2ce88a0be43c1d933a921e310346642 Mon Sep 17 00:00:00 2001 From: Aikar 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/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java index bc6e190..770d7ed 100644 --- a/src/main/java/net/minecraft/server/Chunk.java +++ b/src/main/java/net/minecraft/server/Chunk.java @@ -30,6 +30,7 @@ public class Chunk { private boolean j; public final World world; public final int[] heightMap; + public final long chunkKey; // Paper public final int locX; public final int locZ; private boolean m; @@ -96,6 +97,7 @@ public class Chunk { this.world = world; this.locX = i; this.locZ = j; + this.chunkKey = org.bukkit.craftbukkit.util.LongHash.toLong(this.locX, this.locZ); // Paper this.heightMap = new int[256]; for (int k = 0; k < this.entitySlices.length; ++k) { diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java index 990e3f0..1fd844b 100644 --- a/src/main/java/net/minecraft/server/ChunkProviderServer.java +++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java @@ -27,7 +27,27 @@ public class ChunkProviderServer implements IChunkProvider { public final Set unloadQueue = Sets.newHashSet(); public final ChunkGenerator chunkGenerator; private final IChunkLoader chunkLoader; - public final Long2ObjectMap chunks = new Long2ObjectOpenHashMap(8192); + // Paper start + protected Chunk lastChunkByPos = null; + public Long2ObjectOpenHashMap chunks = new Long2ObjectOpenHashMap(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; public ChunkProviderServer(WorldServer worldserver, IChunkLoader ichunkloader, ChunkGenerator chunkgenerator) { -- 2.8.3