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Paper/patches/server/0768-Do-not-copy-visible-chunks.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 21 Mar 2021 11:22:10 -0700
Subject: [PATCH] Do not copy visible chunks
For servers with a lot of chunk holders, copying for each
tickDistanceManager call can take up quite a bit in
the function. I saw approximately 1/3rd of the function
on the copy.
diff --git a/src/main/java/com/destroystokyo/paper/PaperCommand.java b/src/main/java/com/destroystokyo/paper/PaperCommand.java
index 807bbe54f6516f794bdcb735bb7b8d6812e3ef01..2ef4b4c2ff81d0fa33d4630593266066d8e6a6f3 100644
--- a/src/main/java/com/destroystokyo/paper/PaperCommand.java
+++ b/src/main/java/com/destroystokyo/paper/PaperCommand.java
@@ -277,7 +277,7 @@ public class PaperCommand extends Command {
int ticking = 0;
int entityTicking = 0;
- for (ChunkHolder chunk : world.getChunkSource().chunkMap.updatingChunkMap.values()) {
+ for (ChunkHolder chunk : world.getChunkSource().chunkMap.updatingChunks.getUpdatingMap().values()) { // Paper - change updating chunks map
if (chunk.getFullChunkUnchecked() == null) {
continue;
}
diff --git a/src/main/java/net/minecraft/server/MCUtil.java b/src/main/java/net/minecraft/server/MCUtil.java
index 379ba589b0423284d63782d951c64770b160cf2d..ee668b989d661e1db1bdfe05b94d7cdadeae6923 100644
--- a/src/main/java/net/minecraft/server/MCUtil.java
+++ b/src/main/java/net/minecraft/server/MCUtil.java
@@ -614,7 +614,7 @@ public final class MCUtil {
ServerLevel world = ((org.bukkit.craftbukkit.CraftWorld)bukkitWorld).getHandle();
ChunkMap chunkMap = world.getChunkSource().chunkMap;
- Long2ObjectLinkedOpenHashMap<ChunkHolder> visibleChunks = chunkMap.visibleChunkMap;
+ Long2ObjectLinkedOpenHashMap<ChunkHolder> visibleChunks = chunkMap.updatingChunks.getVisibleMap(); // Paper
DistanceManager chunkMapDistance = chunkMap.distanceManager;
List<ChunkHolder> allChunks = new ArrayList<>(visibleChunks.values());
List<ServerPlayer> players = world.players;
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index aae8dca773686bec3f867b79aa11d668032b9244..2f5ab00d26dcf027ec0e152a8bf17686a280ae50 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -114,9 +114,11 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
private static final int MIN_VIEW_DISTANCE = 3;
public static final int MAX_VIEW_DISTANCE = 33;
public static final int MAX_CHUNK_DISTANCE = 33 + ChunkStatus.maxDistance();
+ // Paper start - Don't copy
+ public final com.destroystokyo.paper.util.map.QueuedChangesMapLong2Object<ChunkHolder> updatingChunks = new com.destroystokyo.paper.util.map.QueuedChangesMapLong2Object<>();
+ // Paper end - Don't copy
public static final int FORCED_TICKET_LEVEL = 31;
- public final Long2ObjectLinkedOpenHashMap<ChunkHolder> updatingChunkMap = new Long2ObjectLinkedOpenHashMap();
- public volatile Long2ObjectLinkedOpenHashMap<ChunkHolder> visibleChunkMap;
+ // Paper - Don't copy
private final Long2ObjectLinkedOpenHashMap<ChunkHolder> pendingUnloads;
public final LongSet entitiesInLevel;
public final ServerLevel level;
@@ -344,7 +346,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
boolean unloadingPlayerChunk = false; // Paper - do not allow ticket level changes while unloading chunks
public ChunkMap(ServerLevel world, LevelStorageSource.LevelStorageAccess session, DataFixer dataFixer, StructureManager structureManager, Executor executor, BlockableEventLoop<Runnable> mainThreadExecutor, LightChunkGetter chunkProvider, ChunkGenerator chunkGenerator, ChunkProgressListener worldGenerationProgressListener, ChunkStatusUpdateListener chunkStatusChangeListener, Supplier<DimensionDataStorage> persistentStateManagerFactory, int viewDistance, boolean dsync) {
super(new File(session.getDimensionPath(world.dimension()), "region"), dataFixer, dsync);
- this.visibleChunkMap = this.updatingChunkMap.clone();
+ // Paper - don't copy
this.pendingUnloads = new Long2ObjectLinkedOpenHashMap();
this.entitiesInLevel = new LongOpenHashSet();
this.toDrop = new LongOpenHashSet();
@@ -676,12 +678,17 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
@Nullable
public ChunkHolder getUpdatingChunkIfPresent(long pos) {
- return (ChunkHolder) this.updatingChunkMap.get(pos);
+ return this.updatingChunks.getUpdating(pos); // Paper - Don't copy
}
@Nullable
public ChunkHolder getVisibleChunkIfPresent(long pos) {
- return (ChunkHolder) this.visibleChunkMap.get(pos);
+ // Paper start - Don't copy
+ if (Thread.currentThread() == this.level.thread) {
+ return this.updatingChunks.getVisible(pos);
+ }
+ return this.updatingChunks.getVisibleAsync(pos);
+ // Paper end - Don't copy
}
protected IntSupplier getChunkQueueLevel(long pos) {
@@ -833,7 +840,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
// Paper end
}
- this.updatingChunkMap.put(pos, holder);
+ this.updatingChunks.queueUpdate(pos, holder); // Paper - Don't copy
this.modified = true;
}
@@ -913,7 +920,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
protected void saveAllChunks(boolean flush) {
if (flush) {
- List<ChunkHolder> list = (List) this.visibleChunkMap.values().stream().filter(ChunkHolder::wasAccessibleSinceLastSave).peek(ChunkHolder::refreshAccessibility).collect(Collectors.toList());
+ List<ChunkHolder> list = (List) this.updatingChunks.getVisibleValuesCopy().stream().filter(ChunkHolder::wasAccessibleSinceLastSave).peek(ChunkHolder::refreshAccessibility).collect(Collectors.toList()); // Paper
MutableBoolean mutableboolean = new MutableBoolean();
do {
@@ -944,7 +951,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
this.level.asyncChunkTaskManager.flush(); // Paper - flush to preserve behavior compat with pre-async behaviour
// this.i(); // Paper - nuke IOWorker
} else {
- this.visibleChunkMap.values().stream().filter(ChunkHolder::wasAccessibleSinceLastSave).forEach((playerchunk) -> {
+ this.updatingChunks.getVisibleValuesCopy().stream().filter(ChunkHolder::wasAccessibleSinceLastSave).forEach((playerchunk) -> { // Paper
ChunkAccess ichunkaccess = (ChunkAccess) playerchunk.getChunkToSave().getNow(null); // CraftBukkit - decompile error
if (ichunkaccess instanceof ImposterProtoChunk || ichunkaccess instanceof LevelChunk) {
@@ -986,7 +993,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
while (longiterator.hasNext()) { // Spigot
long j = longiterator.nextLong();
longiterator.remove(); // Spigot
- ChunkHolder playerchunk = (ChunkHolder) this.updatingChunkMap.remove(j);
+ ChunkHolder playerchunk = this.updatingChunks.queueRemove(j); // Paper - Don't copy
if (playerchunk != null) {
this.pendingUnloads.put(j, playerchunk);
@@ -1121,7 +1128,12 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
if (!this.modified) {
return false;
} else {
- this.visibleChunkMap = this.updatingChunkMap.clone();
+ // Paper start - Don't copy
+ synchronized (this.updatingChunks) {
+ this.updatingChunks.performUpdates();
+ }
+ // Paper end - Don't copy
+
this.modified = false;
return true;
}
@@ -1587,7 +1599,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
public int size() {
- return this.visibleChunkMap.size();
+ return this.updatingChunks.getVisibleMap().size(); // Paper - Don't copy
}
protected DistanceManager getDistanceManager() {
@@ -1595,12 +1607,12 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
protected Iterable<ChunkHolder> getChunks() {
- return Iterables.unmodifiableIterable(this.visibleChunkMap.values());
+ return Iterables.unmodifiableIterable(this.updatingChunks.getVisibleValuesCopy()); // Paper
}
void dumpChunks(Writer writer) throws IOException {
CsvOutput csvwriter = CsvOutput.builder().addColumn("x").addColumn("z").addColumn("level").addColumn("in_memory").addColumn("status").addColumn("full_status").addColumn("accessible_ready").addColumn("ticking_ready").addColumn("entity_ticking_ready").addColumn("ticket").addColumn("spawning").addColumn("block_entity_count").build(writer);
- ObjectBidirectionalIterator objectbidirectionaliterator = this.visibleChunkMap.long2ObjectEntrySet().iterator();
+ ObjectBidirectionalIterator objectbidirectionaliterator = this.updatingChunks.getVisibleMap().clone().long2ObjectEntrySet().fastIterator(); // Paper
while (objectbidirectionaliterator.hasNext()) {
Entry<ChunkHolder> 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 a1f26413e30c80162738595427837c7177357a1b..072c2bbd8dd94bf3b687cee2eb7c09c79190231c 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -149,7 +149,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
@Override
public int getTileEntityCount() {
// We don't use the full world tile entity list, so we must iterate chunks
- Long2ObjectLinkedOpenHashMap<ChunkHolder> chunks = world.getChunkSource().chunkMap.visibleChunkMap;
+ Long2ObjectLinkedOpenHashMap<ChunkHolder> chunks = world.getChunkSource().chunkMap.updatingChunks.getVisibleMap(); // Paper - change updating chunks map
int size = 0;
for (ChunkHolder playerchunk : chunks.values()) {
net.minecraft.world.level.chunk.LevelChunk chunk = playerchunk.getTickingChunk();
@@ -170,7 +170,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
public int getChunkCount() {
int ret = 0;
- for (ChunkHolder chunkHolder : world.getChunkSource().chunkMap.visibleChunkMap.values()) {
+ for (ChunkHolder chunkHolder : world.getChunkSource().chunkMap.updatingChunks.getVisibleMap().values()) { // Paper - change updating chunks map
if (chunkHolder.getTickingChunk() != null) {
++ret;
}
@@ -343,7 +343,18 @@ public class CraftWorld extends CraftRegionAccessor implements World {
@Override
public Chunk[] getLoadedChunks() {
- Long2ObjectLinkedOpenHashMap<ChunkHolder> chunks = this.world.getChunkSource().chunkMap.visibleChunkMap;
+ // Paper start
+ if (Thread.currentThread() != world.getLevel().thread) {
+ // Paper start - change updating chunks map
+ Long2ObjectLinkedOpenHashMap<ChunkHolder> chunks;
+ synchronized (world.getChunkSource().chunkMap.updatingChunks) {
+ chunks = world.getChunkSource().chunkMap.updatingChunks.getVisibleMap().clone();
+ }
+ return chunks.values().stream().map(ChunkHolder::getFullChunk).filter(Objects::nonNull).map(net.minecraft.world.level.chunk.LevelChunk::getBukkitChunk).toArray(Chunk[]::new);
+ // Paper end - change updating chunks map
+ }
+ // Paper end
+ Long2ObjectLinkedOpenHashMap<ChunkHolder> chunks = world.getChunkSource().chunkMap.updatingChunks.getVisibleMap(); // Paper - change updating chunks map
return chunks.values().stream().map(ChunkHolder::getFullChunk).filter(Objects::nonNull).map(net.minecraft.world.level.chunk.LevelChunk::getBukkitChunk).toArray(Chunk[]::new);
}
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