480a87933a
While the previous logic was logically correct, some CB API's before would request a chunk without removing it from the unload queue. While this is logically wrong, some plugins seem to be causing unload issues. This change will make anything using that one API that use to not remove from queue, no longer remove from queue. Hopefully other activities on the server will touch the chunk if it REALLY is in use.
280 lines
13 KiB
Diff
280 lines
13 KiB
Diff
From f3feb831b366194cd979e43409b6c0180cfbd58f Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Fri, 18 Mar 2016 17:57:25 -0400
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Subject: [PATCH] Optimize Chunk Unload Queue
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Removing chunks from the unload queue when performing chunk lookups is a costly activity.
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It drastically slows down server performance as many methods call getChunkAt, resulting in a bandaid
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to skip removing chunks from the unload queue.
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This patch optimizes the unload queue to instead use a boolean on the Chunk object itself to mark
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if the chunk is active, and then insert into a LinkedList queue.
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The benefits here is that all chunk unload queue actions are now O(1) constant time.
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A LinkedList will never need to resize, and can be removed from in constant time when
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used in a queue like method.
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We mark the chunk as active in many places that notify it is still being used, so that
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when the chunk unload queue reaches that chunk, and sees the chunk became active again,
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it will skip it and move to next.
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diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
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index b6d84d7..a4c0b4e 100644
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--- a/src/main/java/net/minecraft/server/Chunk.java
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+++ b/src/main/java/net/minecraft/server/Chunk.java
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@@ -55,6 +55,8 @@ public class Chunk {
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// Keep this synced with entitySlices.add() and entitySlices.remove()
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private final int[] itemCounts = new int[16];
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private final int[] inventoryEntityCounts = new int[16];
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+ public boolean isChunkActive = true;
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+ public boolean isInUnloadQueue = false;
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// Paper end
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// CraftBukkit start - Neighbor loaded cache for chunk lighting and entity ticking
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@@ -780,6 +782,7 @@ public class Chunk {
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}
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public void addEntities() {
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+ isChunkActive = true; // Paper
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this.i = true;
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this.world.b(this.tileEntities.values());
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@@ -798,6 +801,7 @@ public class Chunk {
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}
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public void removeEntities() {
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+ isChunkActive = false; // Paper
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this.i = false;
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Iterator iterator = this.tileEntities.values().iterator();
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diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
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index 9ef6246..f696e27 100644
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--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
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+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
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@@ -21,7 +21,7 @@ import org.bukkit.event.world.ChunkUnloadEvent;
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public class ChunkProviderServer implements IChunkProvider {
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private static final Logger a = LogManager.getLogger();
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- public final LongHashSet unloadQueue = new LongHashSet(); // CraftBukkit - LongHashSet
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+ public final ChunkUnloadQueue unloadQueue = new ChunkUnloadQueue(); // CraftBukkit - LongHashSet // Paper -> ChunkUnloadQueue
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public final ChunkGenerator chunkGenerator; // CraftBukkit - public
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private final IChunkLoader chunkLoader;
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public LongObjectHashMap<Chunk> chunks = new LongObjectHashMap<Chunk>(); // CraftBukkit
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@@ -79,18 +79,27 @@ public class ChunkProviderServer implements IChunkProvider {
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// CraftBukkit start - Add async variant, provide compatibility
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public Chunk getOrCreateChunkFast(int x, int z) {
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- Chunk chunk = chunks.get(LongHash.toLong(x, z));
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- return (chunk == null) ? getChunkAt(x, z) : chunk;
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+ return getChunkAt(x, z); // Paper
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+ }
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+
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+ // Paper start
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+ public Chunk getLoadedChunkAtWithoutMarkingActive(int i, int j) {
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+ return chunks.get(LongHash.toLong(i, j));
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}
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- public Chunk getChunkIfLoaded(int x, int z) {
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- return chunks.get(LongHash.toLong(x, z));
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+ // getChunkIfLoaded -> getChunkIfActive
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+ // this is only used by CraftBukkit now, and plugins shouldnt mark things active
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+ public Chunk getChunkIfActive(int x, int z) {
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+ Chunk chunk = chunks.get(LongHash.toLong(x, z));
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+ return (chunk != null && chunk.isChunkActive) ? chunk : null;
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}
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+ // Paper end
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public Chunk getLoadedChunkAt(int i, int j) {
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Chunk chunk = chunks.get(LongHash.toLong(i, j)); // CraftBukkit
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this.unloadQueue.remove(i, j); // CraftBukkit
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+ if (chunk != null) { chunk.isChunkActive = true; }// Paper
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return chunk;
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}
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@@ -151,6 +160,7 @@ public class ChunkProviderServer implements IChunkProvider {
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runnable.run();
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}
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+ chunk.isChunkActive = true; // Paper
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return chunk;
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}
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@@ -201,7 +211,7 @@ public class ChunkProviderServer implements IChunkProvider {
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continue;
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}
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- Chunk neighbor = this.getChunkIfLoaded(chunk.locX + x, chunk.locZ + z);
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+ Chunk neighbor = this.getLoadedChunkAtWithoutMarkingActive(chunk.locX + x, chunk.locZ + z); // Paper
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if (neighbor != null) {
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neighbor.setNeighborLoaded(-x, -z);
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chunk.setNeighborLoaded(x, z);
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@@ -300,10 +310,17 @@ public class ChunkProviderServer implements IChunkProvider {
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if (!this.world.savingDisabled) {
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// CraftBukkit start
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Server server = this.world.getServer();
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- for (int i = 0; i < 100 && !this.unloadQueue.isEmpty(); ++i) {
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- long chunkcoordinates = this.unloadQueue.popFirst();
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- Chunk chunk = this.chunks.get(chunkcoordinates);
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- if (chunk == null) continue;
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+ // Paper start
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+ final Iterator<Chunk> iterator = this.unloadQueue.iterator();
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+ for (int i = 0; i < 100 && iterator.hasNext(); ++i) {
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+ Chunk chunk = iterator.next();
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+ iterator.remove();
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+ long chunkcoordinates = LongHash.toLong(chunk.locX, chunk.locZ);
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+ chunk.isInUnloadQueue = false;
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+ if (chunk.isChunkActive) {
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+ continue;
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+ }
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+ // Paper end
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ChunkUnloadEvent event = new ChunkUnloadEvent(chunk.bukkitChunk);
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server.getPluginManager().callEvent(event);
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@@ -325,7 +342,7 @@ public class ChunkProviderServer implements IChunkProvider {
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continue;
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}
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- Chunk neighbor = this.getChunkIfLoaded(chunk.locX + x, chunk.locZ + z);
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+ Chunk neighbor = this.getLoadedChunkAtWithoutMarkingActive(chunk.locX + x, chunk.locZ + z); // Paper
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if (neighbor != null) {
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neighbor.setNeighborUnloaded(-x, -z);
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chunk.setNeighborUnloaded(x, z);
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@@ -367,4 +384,22 @@ public class ChunkProviderServer implements IChunkProvider {
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public boolean e(int i, int j) {
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return this.chunks.containsKey(LongHash.toLong(i, j)); // CraftBukkit
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}
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+
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+ // Paper start
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+ public class ChunkUnloadQueue extends java.util.LinkedList<Chunk> {
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+ public void remove(int x, int z) {
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+ // nothing! Just to reduce diff
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+ }
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+ public void add(int x, int z) {
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+ final Chunk chunk = chunks.get(LongHash.toLong(x, z));
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+ if (chunk != null) {
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+ chunk.isChunkActive = false;
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+ if (!chunk.isInUnloadQueue) {
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+ chunk.isInUnloadQueue = true;
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+ add(chunk);
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+ }
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+ }
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+ }
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+ }
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+ // Paper end
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}
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diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java
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index 63e118d..721bcae 100644
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--- a/src/main/java/net/minecraft/server/SpawnerCreature.java
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+++ b/src/main/java/net/minecraft/server/SpawnerCreature.java
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@@ -28,7 +28,7 @@ public final class SpawnerCreature {
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Long coord = it.next();
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int x = LongHash.msw( coord );
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int z = LongHash.lsw( coord );
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- if ( !((ChunkProviderServer)server.chunkProvider).unloadQueue.contains( coord ) && server.isChunkLoaded( x, z, true ) )
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+ if ( server.isChunkLoaded( x, z, true ) ) // Paper
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{
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i += server.getChunkAt( x, z ).entityCount.get( oClass );
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}
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diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
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index b356aa6..f996c53 100644
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--- a/src/main/java/net/minecraft/server/World.java
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+++ b/src/main/java/net/minecraft/server/World.java
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@@ -157,9 +157,15 @@ public abstract class World implements IBlockAccess {
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}
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public Chunk getChunkIfLoaded(int x, int z) {
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- return ((ChunkProviderServer) this.chunkProvider).getChunkIfLoaded(x, z);
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+ return ((ChunkProviderServer) this.chunkProvider).getLoadedChunkAtWithoutMarkingActive(x, z); // Paper - This is added by CB, and will not mark as active. Simply an alias
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}
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+ // Paper start
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+ public Chunk getChunkIfActive(int x, int z) {
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+ return ((ChunkProviderServer) this.chunkProvider).getChunkIfActive(x, z);
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+ }
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+ // Paper end
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+
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protected World(IDataManager idatamanager, WorldData worlddata, WorldProvider worldprovider, MethodProfiler methodprofiler, boolean flag, ChunkGenerator gen, org.bukkit.World.Environment env) {
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this.spigotConfig = new org.spigotmc.SpigotWorldConfig( worlddata.getName() ); // Spigot
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this.paperConfig = new com.destroystokyo.paper.PaperWorldConfig(worlddata.getName(), this.spigotConfig); // Paper
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
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index be311cd..c0c642e 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
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@@ -206,7 +206,7 @@ public class CraftWorld implements World {
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}
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// Paper start - Don't create a chunk just to unload it
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- net.minecraft.server.Chunk chunk = world.getChunkProviderServer().getChunkIfLoaded(x, z);
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+ net.minecraft.server.Chunk chunk = world.getChunkProviderServer().getChunkIfActive(x, z); // Paper
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if (chunk == null) {
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return false;
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}
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@@ -232,7 +232,7 @@ public class CraftWorld implements World {
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continue;
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}
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- net.minecraft.server.Chunk neighbor = world.getChunkProviderServer().getChunkIfLoaded(chunk.locX + x, chunk.locZ + z);
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+ net.minecraft.server.Chunk neighbor = world.getChunkProviderServer().getLoadedChunkAtWithoutMarkingActive(chunk.locX + x, chunk.locZ + z); // Paper
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if (neighbor != null) {
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neighbor.setNeighborUnloaded(-xx, -zz);
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chunk.setNeighborUnloaded(xx, zz);
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@@ -302,7 +302,7 @@ public class CraftWorld implements World {
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world.timings.syncChunkLoadTimer.startTiming(); // Spigot
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chunk = world.getChunkProviderServer().getOrLoadChunkAt(x, z);
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world.timings.syncChunkLoadTimer.stopTiming(); // Spigot
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- }
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+ } else { chunk.isChunkActive = true; } // Paper
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return chunk != null;
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}
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@@ -319,7 +319,7 @@ public class CraftWorld implements World {
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continue;
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}
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- net.minecraft.server.Chunk neighbor = world.getChunkProviderServer().getChunkIfLoaded(chunk.locX + x, chunk.locZ + z);
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+ net.minecraft.server.Chunk neighbor = world.getChunkProviderServer().getLoadedChunkAtWithoutMarkingActive(chunk.locX + x, chunk.locZ + z); // Paper
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if (neighbor != null) {
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neighbor.setNeighborLoaded(-x, -z);
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chunk.setNeighborLoaded(x, z);
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@@ -1538,7 +1538,7 @@ public class CraftWorld implements World {
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}
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// Already unloading?
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- if (cps.unloadQueue.contains(chunk.locX, chunk.locZ)) {
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+ if (!chunk.isChunkActive) { // Paper
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continue;
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}
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diff --git a/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java b/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java
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index 482af17..a1a6d5a 100644
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--- a/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java
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+++ b/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java
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@@ -62,7 +62,7 @@ class ChunkIOProvider implements AsynchronousExecutor.CallBackProvider<QueuedChu
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continue;
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}
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- Chunk neighbor = queuedChunk.provider.getChunkIfLoaded(chunk.locX + x, chunk.locZ + z);
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+ Chunk neighbor = queuedChunk.provider.getLoadedChunkAtWithoutMarkingActive(chunk.locX + x, chunk.locZ + z); // Paper
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if (neighbor != null) {
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neighbor.setNeighborLoaded(-x, -z);
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chunk.setNeighborLoaded(x, z);
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diff --git a/src/main/java/org/spigotmc/ActivationRange.java b/src/main/java/org/spigotmc/ActivationRange.java
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index daed1db..ba60f1a 100644
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--- a/src/main/java/org/spigotmc/ActivationRange.java
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+++ b/src/main/java/org/spigotmc/ActivationRange.java
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@@ -250,7 +250,7 @@ public class ActivationRange
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int x = MathHelper.floor( entity.locX );
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int z = MathHelper.floor( entity.locZ );
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// Make sure not on edge of unloaded chunk
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- Chunk chunk = entity.world.getChunkIfLoaded( x >> 4, z >> 4 );
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+ Chunk chunk = entity.world.getChunkIfActive( x >> 4, z >> 4 ); // Paper
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if ( isActive && !( chunk != null && chunk.areNeighborsLoaded( 1 ) ) )
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{
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isActive = false;
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--
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2.7.4
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