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papermc/Spigot-Server-Patches/0456-Optimize-PlayerChunkMap-memory-use-for-visibleChunks.patch
Aikar 210a32f26f
Unload leaked Cached Chunks 
Due to some complexity in mojangs complicated chain of juggling
whether or not a chunk should be unloaded when the last ticket is
removed, many chunks are remaining around in the cache.

These chunks are never being targetted for unload because they are
vastly out of view distance range and have no reason to be looked at.

This is a huge issue for performance because we have to iterate these
chunks EVERY TICK... This is what's been leading to high SELF time in
Ticking Chunks timings/profiler results.

We will now detect these chunks in that iteration, and automatically
add it to the unload queue when the chunk is found without any tickets.
2020-05-25 11:12:22 -04:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 8 Apr 2020 03:06:30 -0400
Subject: [PATCH] Optimize PlayerChunkMap memory use for visibleChunks
No longer clones visible chunks which is causing massive memory
allocation issues, likely the source of Humongous Objects on large servers.
Instead we just synchronize, clear and rebuild, reusing the same object buffers
as before with only 2 small objects created (FastIterator/MapEntry)
This should result in siginificant memory use reduction and improved GC behavior.
diff --git a/src/main/java/com/destroystokyo/paper/util/map/Long2ObjectLinkedOpenHashMapFastCopy.java b/src/main/java/com/destroystokyo/paper/util/map/Long2ObjectLinkedOpenHashMapFastCopy.java
new file mode 100644
index 0000000000000000000000000000000000000000..f6ff4d8132a95895680f5bc81f8f873e78f0bbdb
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/util/map/Long2ObjectLinkedOpenHashMapFastCopy.java
@@ -0,0 +1,39 @@
+package com.destroystokyo.paper.util.map;
+
+import it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap;
+
+public class Long2ObjectLinkedOpenHashMapFastCopy<V> extends Long2ObjectLinkedOpenHashMap<V> {
+
+ public void copyFrom(Long2ObjectLinkedOpenHashMapFastCopy<V> map) {
+ if (key.length != map.key.length) {
+ key = null;
+ key = new long[map.key.length];
+ }
+ if (value.length != map.value.length) {
+ value = null;
+ //noinspection unchecked
+ value = (V[]) new Object[map.value.length];
+ }
+ if (link.length != map.link.length) {
+ link = null;
+ link = new long[map.link.length];
+ }
+ System.arraycopy(map.key, 0, this.key, 0, map.key.length);
+ System.arraycopy(map.value, 0, this.value, 0, map.value.length);
+ System.arraycopy(map.link, 0, this.link, 0, map.link.length);
+ this.size = map.size;
+ this.mask = map.mask;
+ this.first = map.first;
+ this.last = map.last;
+ this.n = map.n;
+ this.maxFill = map.maxFill;
+ this.containsNullKey = map.containsNullKey;
+ }
+
+ @Override
+ public Long2ObjectLinkedOpenHashMapFastCopy<V> clone() {
+ Long2ObjectLinkedOpenHashMapFastCopy<V> clone = (Long2ObjectLinkedOpenHashMapFastCopy<V>) super.clone();
+ clone.copyFrom(this);
+ return clone;
+ }
+}
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index d53b34ba552771bf271131ce0a56ebb992ccc84c..a1b5e6b90fc93f83186cf3ebf3e158767008c69a 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -756,7 +756,7 @@ public class ChunkProviderServer extends IChunkProvider {
entityPlayer.playerNaturallySpawnedEvent.callEvent();
};
// Paper end
- this.playerChunkMap.f().forEach((playerchunk) -> {
+ this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping
Optional<Chunk> optional = ((Either) playerchunk.b().getNow(PlayerChunk.UNLOADED_CHUNK)).left();
if (optional.isPresent()) {
diff --git a/src/main/java/net/minecraft/server/MCUtil.java b/src/main/java/net/minecraft/server/MCUtil.java
index 9f8c0e10e42d233a8b74ee5a71fb8fb6ea8e7480..0d1065688b19ceca9440bc8bf2bf65910f03fa46 100644
--- a/src/main/java/net/minecraft/server/MCUtil.java
+++ b/src/main/java/net/minecraft/server/MCUtil.java
@@ -628,7 +628,7 @@ public final class MCUtil {
WorldServer world = ((org.bukkit.craftbukkit.CraftWorld)bukkitWorld).getHandle();
PlayerChunkMap chunkMap = world.getChunkProvider().playerChunkMap;
- Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks = chunkMap.visibleChunks;
+ Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks = chunkMap.getVisibleChunks();
ChunkMapDistance chunkMapDistance = chunkMap.getChunkMapDistanceManager();
List<PlayerChunk> allChunks = new ArrayList<>(visibleChunks.values());
List<EntityPlayer> players = world.players;
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index c900bfb9edf957ebdbd83cc44280440648288250..8cd77117cdb81e3fbd196415f8ac82d3aeddcb12 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -55,8 +55,33 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
private static final Logger LOGGER = LogManager.getLogger();
public static final int GOLDEN_TICKET = 33 + ChunkStatus.b();
- public final Long2ObjectLinkedOpenHashMap<PlayerChunk> updatingChunks = new Long2ObjectLinkedOpenHashMap();
- public volatile Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks;
+ // Paper start - faster copying
+ public final Long2ObjectLinkedOpenHashMap<PlayerChunk> updatingChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<>(); // Paper - faster copying
+ public final Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks = new ProtectedVisibleChunksMap(); // Paper - faster copying
+
+ private class ProtectedVisibleChunksMap extends com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> {
+ @Override
+ public PlayerChunk put(long k, PlayerChunk playerChunk) {
+ throw new UnsupportedOperationException("Updating visible Chunks");
+ }
+
+ @Override
+ public PlayerChunk remove(long k) {
+ throw new UnsupportedOperationException("Removing visible Chunks");
+ }
+
+ @Override
+ public PlayerChunk get(long k) {
+ return PlayerChunkMap.this.getVisibleChunk(k);
+ }
+
+ public PlayerChunk safeGet(long k) {
+ return super.get(k);
+ }
+ }
+ // Paper end
+ public final com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> pendingVisibleChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk>(); // Paper - this is used if the visible chunks is updated while iterating only
+ public transient com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> visibleChunksClone; // Paper - used for async access of visible chunks, clone and cache only when needed
private final Long2ObjectLinkedOpenHashMap<PlayerChunk> pendingUnload;
final LongSet loadedChunks; // Paper - private -> package
public final WorldServer world;
@@ -130,7 +155,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
public PlayerChunkMap(WorldServer worldserver, File file, DataFixer datafixer, DefinedStructureManager definedstructuremanager, Executor executor, IAsyncTaskHandler<Runnable> iasynctaskhandler, ILightAccess ilightaccess, ChunkGenerator<?> chunkgenerator, WorldLoadListener worldloadlistener, Supplier<WorldPersistentData> supplier, int i) {
super(new File(worldserver.getWorldProvider().getDimensionManager().a(file), "region"), datafixer);
- this.visibleChunks = this.updatingChunks.clone();
+ //this.visibleChunks = this.updatingChunks.clone(); // Paper - no more cloning
this.pendingUnload = new Long2ObjectLinkedOpenHashMap();
this.loadedChunks = new LongOpenHashSet();
this.unloadQueue = new LongOpenHashSet();
@@ -221,9 +246,52 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
return (PlayerChunk) this.updatingChunks.get(i);
}
+ // Paper start - remove cloning of visible chunks unless accessed as a collection async
+ private static final boolean DEBUG_ASYNC_VISIBLE_CHUNKS = Boolean.getBoolean("paper.debug-async-visible-chunks");
+ private boolean isIterating = false;
+ private boolean hasPendingVisibleUpdate = false;
+ public void forEachVisibleChunk(java.util.function.Consumer<PlayerChunk> consumer) {
+ org.spigotmc.AsyncCatcher.catchOp("forEachVisibleChunk");
+ boolean prev = isIterating;
+ isIterating = true;
+ try {
+ for (PlayerChunk value : this.visibleChunks.values()) {
+ consumer.accept(value);
+ }
+ } finally {
+ this.isIterating = prev;
+ if (!this.isIterating && this.hasPendingVisibleUpdate) {
+ ((ProtectedVisibleChunksMap)this.visibleChunks).copyFrom(this.pendingVisibleChunks);
+ this.pendingVisibleChunks.clear();
+ this.hasPendingVisibleUpdate = false;
+ }
+ }
+ }
+ public Long2ObjectLinkedOpenHashMap<PlayerChunk> getVisibleChunks() {
+ if (Thread.currentThread() == this.world.serverThread) {
+ return this.visibleChunks;
+ } else {
+ synchronized (this.visibleChunks) {
+ if (DEBUG_ASYNC_VISIBLE_CHUNKS) new Throwable("Async getVisibleChunks").printStackTrace();
+ if (this.visibleChunksClone == null) {
+ this.visibleChunksClone = this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.clone() : ((ProtectedVisibleChunksMap)this.visibleChunks).clone();
+ }
+ return this.visibleChunksClone;
+ }
+ }
+ }
+ // Paper end
+
@Nullable
public PlayerChunk getVisibleChunk(long i) { // Paper - protected -> public
- return (PlayerChunk) this.visibleChunks.get(i);
+ // Paper start - mt safe get
+ if (Thread.currentThread() != this.world.serverThread) {
+ synchronized (this.visibleChunks) {
+ return (PlayerChunk) (this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.get(i) : ((ProtectedVisibleChunksMap)this.visibleChunks).safeGet(i));
+ }
+ }
+ return (PlayerChunk) (this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.get(i) : ((ProtectedVisibleChunksMap)this.visibleChunks).safeGet(i));
+ // Paper end
}
protected IntSupplier c(long i) {
@@ -411,8 +479,9 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
// Paper end
protected void save(boolean flag) {
+ Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks = this.getVisibleChunks(); // Paper remove clone of visible Chunks unless saving off main thread (watchdog kill)
if (flag) {
- List<PlayerChunk> list = (List) this.visibleChunks.values().stream().filter(PlayerChunk::hasBeenLoaded).peek(PlayerChunk::m).collect(Collectors.toList());
+ List<PlayerChunk> list = (List) visibleChunks.values().stream().filter(PlayerChunk::hasBeenLoaded).peek(PlayerChunk::m).collect(Collectors.toList()); // Paper - remove cloning of visible chunks
MutableBoolean mutableboolean = new MutableBoolean();
do {
@@ -440,7 +509,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
// this.i(); // Paper - nuke IOWorker
PlayerChunkMap.LOGGER.info("ThreadedAnvilChunkStorage ({}): All chunks are saved", this.w.getName());
} else {
- this.visibleChunks.values().stream().filter(PlayerChunk::hasBeenLoaded).forEach((playerchunk) -> {
+ visibleChunks.values().stream().filter(PlayerChunk::hasBeenLoaded).forEach((playerchunk) -> {
IChunkAccess ichunkaccess = (IChunkAccess) playerchunk.getChunkSave().getNow(null); // CraftBukkit - decompile error
if (ichunkaccess instanceof ProtoChunkExtension || ichunkaccess instanceof Chunk) {
@@ -611,7 +680,20 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
if (!this.updatingChunksModified) {
return false;
} else {
- this.visibleChunks = this.updatingChunks.clone();
+ // Paper start - stop cloning visibleChunks
+ synchronized (this.visibleChunks) {
+ if (isIterating) {
+ hasPendingVisibleUpdate = true;
+ this.pendingVisibleChunks.copyFrom((com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk>)this.updatingChunks);
+ } else {
+ hasPendingVisibleUpdate = false;
+ this.pendingVisibleChunks.clear();
+ ((ProtectedVisibleChunksMap)this.visibleChunks).copyFrom((com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk>)this.updatingChunks);
+ this.visibleChunksClone = null;
+ }
+ }
+ // Paper end
+
this.updatingChunksModified = false;
return true;
}
@@ -1077,12 +1159,12 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
}
protected Iterable<PlayerChunk> f() {
- return Iterables.unmodifiableIterable(this.visibleChunks.values());
+ return Iterables.unmodifiableIterable(this.getVisibleChunks().values()); // Paper
}
void a(Writer writer) throws IOException {
CSVWriter csvwriter = CSVWriter.a().a("x").a("z").a("level").a("in_memory").a("status").a("full_status").a("accessible_ready").a("ticking_ready").a("entity_ticking_ready").a("ticket").a("spawning").a("entity_count").a("block_entity_count").a(writer);
- ObjectBidirectionalIterator objectbidirectionaliterator = this.visibleChunks.long2ObjectEntrySet().iterator();
+ ObjectBidirectionalIterator objectbidirectionaliterator = this.getVisibleChunks().long2ObjectEntrySet().iterator(); // Paper
while (objectbidirectionaliterator.hasNext()) {
Entry<PlayerChunk> entry = (Entry) objectbidirectionaliterator.next();
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 5f51e8c05a822dfad35bcfa4c9a33f1f067e85a7..efa92c798010b4815b4aa63fe1e4832eeeccd9e9 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -74,6 +74,7 @@ import net.minecraft.server.GameRules;
import net.minecraft.server.GroupDataEntity;
import net.minecraft.server.IBlockData;
import net.minecraft.server.IChunkAccess;
+import net.minecraft.server.MCUtil;
import net.minecraft.server.MinecraftKey;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.MovingObjectPosition;
@@ -291,6 +292,7 @@ public class CraftWorld implements World {
return ret;
}
public int getTileEntityCount() {
+ return MCUtil.ensureMain(() -> {
// We don't use the full world tile entity list, so we must iterate chunks
Long2ObjectLinkedOpenHashMap<PlayerChunk> chunks = world.getChunkProvider().playerChunkMap.visibleChunks;
int size = 0;
@@ -302,11 +304,13 @@ public class CraftWorld implements World {
size += chunk.tileEntities.size();
}
return size;
+ });
}
public int getTickableTileEntityCount() {
return world.tileEntityListTick.size();
}
public int getChunkCount() {
+ return MCUtil.ensureMain(() -> {
int ret = 0;
for (PlayerChunk chunkHolder : world.getChunkProvider().playerChunkMap.visibleChunks.values()) {
@@ -315,7 +319,7 @@ public class CraftWorld implements World {
}
}
- return ret;
+ return ret; });
}
public int getPlayerCount() {
return world.players.size();
@@ -435,6 +439,14 @@ public class CraftWorld implements World {
@Override
public Chunk[] getLoadedChunks() {
+ // Paper start
+ if (Thread.currentThread() != world.getMinecraftWorld().serverThread) {
+ synchronized (world.getChunkProvider().playerChunkMap.visibleChunks) {
+ Long2ObjectLinkedOpenHashMap<PlayerChunk> chunks = world.getChunkProvider().playerChunkMap.visibleChunks;
+ return chunks.values().stream().map(PlayerChunk::getFullChunk).filter(Objects::nonNull).map(net.minecraft.server.Chunk::getBukkitChunk).toArray(Chunk[]::new);
+ }
+ }
+ // Paper end
Long2ObjectLinkedOpenHashMap<PlayerChunk> chunks = world.getChunkProvider().playerChunkMap.visibleChunks;
return chunks.values().stream().map(PlayerChunk::getFullChunk).filter(Objects::nonNull).map(net.minecraft.server.Chunk::getBukkitChunk).toArray(Chunk[]::new);
}
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