Paper/CraftBukkit-Patches/0061-Entity-ticking-chunk-caching.patch

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From ea70179245470f2baf92f73a45c87e36e654edbc Mon Sep 17 00:00:00 2001
2013-07-16 13:21:55 +02:00
From: Ammar Askar <ammar@ammaraskar.com>
Date: Tue, 16 Jul 2013 03:32:32 +0500
Subject: [PATCH] Entity ticking chunk caching
Cache known loaded chunks so we avoid making a potentially expensive contains call for every single entity in exchange for some simple arithmetic. Best case scenario, this cuts down contains call to once per chunk, worst case it adds on some simple arithmetic operations
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 8bd7876..ba1c1ca 100644
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--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1221,6 +1221,7 @@ public abstract class World implements IBlockAccess {
CrashReport crashreport;
CrashReportSystemDetails crashreportsystemdetails;
+ long lastChunk = Long.MIN_VALUE; // Spigot - cache chunk x, z cords for unload queue
for (i = 0; i < this.i.size(); ++i) {
entity = (Entity) this.i.get(i);
// CraftBukkit start - Fixed an NPE, don't process entities in chunks queued for unload
@@ -1229,10 +1230,15 @@ public abstract class World implements IBlockAccess {
}
ChunkProviderServer chunkProviderServer = ((WorldServer) this).chunkProviderServer;
- if (chunkProviderServer.unloadQueue.contains(MathHelper.floor(entity.locX) >> 4, MathHelper.floor(entity.locZ) >> 4)) {
- continue;
+ // Spigot start - check last chunk to see if this loaded (fast cache)
+ long chunk = org.bukkit.craftbukkit.util.LongHash.toLong(MathHelper.floor(entity.locX) >> 4, MathHelper.floor(entity.locZ) >> 4);
+ if (lastChunk != chunk) {
+ if (chunkProviderServer.unloadQueue.contains(chunk)) { // Spigot end
+ continue;
+ }
}
// CraftBukkit end
+ lastChunk = chunk; // Spigot
try {
++entity.ticksLived;
@@ -1253,6 +1259,7 @@ public abstract class World implements IBlockAccess {
this.i.remove(i--);
}
}
+ lastChunk = Long.MIN_VALUE; // Spigot
this.methodProfiler.c("remove");
this.entityList.removeAll(this.f);
@@ -1283,10 +1290,15 @@ public abstract class World implements IBlockAccess {
// CraftBukkit start - Don't tick entities in chunks queued for unload
ChunkProviderServer chunkProviderServer = ((WorldServer) this).chunkProviderServer;
- if (chunkProviderServer.unloadQueue.contains(MathHelper.floor(entity.locX) >> 4, MathHelper.floor(entity.locZ) >> 4)) {
- continue;
+ // Spigot start - check last chunk to see if this loaded (fast cache)
+ long chunk = org.bukkit.craftbukkit.util.LongHash.toLong(MathHelper.floor(entity.locX) >> 4, MathHelper.floor(entity.locZ) >> 4);
+ if (lastChunk != chunk) {
+ if (chunkProviderServer.unloadQueue.contains(chunk)) { // Spigot end
+ continue;
+ }
}
// CraftBukkit end
+ lastChunk = Long.MIN_VALUE; // Spigot
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if (entity.vehicle != null) {
if (!entity.vehicle.dead && entity.vehicle.passenger == entity) {
--
2013-08-04 00:51:09 +02:00
1.8.1.2