PaperMC/patches/server/0781-Use-hash-table-for-maintaing-changed-block-set.patch
2021-09-22 21:10:35 -07:00

30 lines
1.6 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Thu, 11 Mar 2021 21:17:02 -0800
Subject: [PATCH] Use hash table for maintaing changed block set
When a lot of block changes occur the iteration for checking can
add up a bit and cause a small performance impact.
diff --git a/src/main/java/net/minecraft/server/level/ChunkHolder.java b/src/main/java/net/minecraft/server/level/ChunkHolder.java
index de0c6316c9b75a2ecc7d6abf7bcca24e25de0ac0..4588ae8037407b81c99135863eb0c4e97c564c24 100644
--- a/src/main/java/net/minecraft/server/level/ChunkHolder.java
+++ b/src/main/java/net/minecraft/server/level/ChunkHolder.java
@@ -41,6 +41,8 @@ import net.minecraft.world.level.lighting.LevelLightEngine;
import net.minecraft.server.MinecraftServer;
// CraftBukkit end
+import it.unimi.dsi.fastutil.shorts.ShortOpenHashSet; // Paper
+
public class ChunkHolder {
public static final Either<ChunkAccess, ChunkHolder.ChunkLoadingFailure> UNLOADED_CHUNK = Either.right(ChunkHolder.ChunkLoadingFailure.UNLOADED);
@@ -390,7 +392,7 @@ public class ChunkHolder {
if (i < 0 || i >= this.changedBlocksPerSection.length) return; // CraftBukkit - SPIGOT-6086, SPIGOT-6296
if (this.changedBlocksPerSection[i] == null) {
this.hasChangedSections = true;
- this.changedBlocksPerSection[i] = new ShortArraySet();
+ this.changedBlocksPerSection[i] = new ShortOpenHashSet(); // Paper - use a set to make setting constant-time
}
this.changedBlocksPerSection[i].add(SectionPos.sectionRelativePos(pos));