PaperMC/Spigot-Server-Patches/0079-Optimize-Chunk-Access.patch
Aikar 2d7e5dce25
Disable Vanilla last chunk access cache, use ours
Also fixes some bugs in ours

Ultimately they both are near the same, but ours is behind the synchronized gate.

Mojangs is mixed behind 2 different synchronization contexts (chunks can lock 2 different objects)

Mojang also blindly unsets the ref on any chunk unload, not just if its the one being pointed to.
2018-08-27 00:26:00 -04:00

90 lines
3.4 KiB
Diff

From e732d1184f1686864d9d9bd11bb409fa18c64709 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/ChunkMap.java b/src/main/java/net/minecraft/server/ChunkMap.java
index fbebd4591c..b941676829 100644
--- a/src/main/java/net/minecraft/server/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/ChunkMap.java
@@ -15,6 +15,7 @@ public class ChunkMap extends Long2ObjectOpenHashMap<Chunk> {
public Chunk a(long i, Chunk chunk) {
chunk.world.timings.syncChunkLoadPostTimer.startTiming(); // Paper
+ lastChunkByPos = chunk; // Paper
Chunk chunk1 = (Chunk) super.put(i, chunk);
ChunkCoordIntPair chunkcoordintpair = new ChunkCoordIntPair(i);
@@ -98,8 +99,22 @@ public class ChunkMap extends Long2ObjectOpenHashMap<Chunk> {
}
}
+ // Paper start
+ if (lastChunkByPos != null && i == lastChunkByPos.chunkKey) {
+ lastChunkByPos = null;
+ }
return chunk;
}
+ private Chunk lastChunkByPos = null;
+
+ @Override
+ public Chunk get(long l) {
+ if (lastChunkByPos != null && l == lastChunkByPos.chunkKey) {
+ return lastChunkByPos;
+ }
+ return lastChunkByPos = super.get(l);
+ }
+ // Paper end
public Chunk a(Object object) {
return this.a(((Long) object).longValue());
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 6b041f06e4..1a1daf36b7 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -78,15 +78,16 @@ public class ChunkProviderServer implements IChunkProvider {
Chunk chunk;
synchronized (this.chunkLoader) {
- if (this.lastChunk != null && this.lastChunk.getPos().x == i && this.lastChunk.getPos().z == j) {
+ // Paper start - remove vanilla lastChunk, we do it more accurately
+ /* if (this.lastChunk != null && this.lastChunk.locX == i && this.lastChunk.locZ == j) {
return this.lastChunk;
- }
+ }*/ // Paper end
long k = ChunkCoordIntPair.a(i, j);
chunk = (Chunk) this.chunks.get(k);
if (chunk != null) {
- this.lastChunk = chunk;
+ //this.lastChunk = chunk; // Paper remove vanilla lastChunk
return chunk;
}
@@ -198,7 +199,7 @@ public class ChunkProviderServer implements IChunkProvider {
}
this.chunks.put(k, chunk);
- this.lastChunk = chunk;
+ //this.lastChunk = chunk; // Paper
}
this.asyncTaskHandler.postToMainThread(chunk::addEntities);
@@ -342,7 +343,7 @@ public class ChunkProviderServer implements IChunkProvider {
this.saveChunk(chunk, true); // Spigot
}
this.chunks.remove(chunk.chunkKey);
- this.lastChunk = null;
+ //this.lastChunk = null; // Paper
return true;
}
// CraftBukkit end
--
2.18.0