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Paper/patches/server/0690-Optimise-chunk-tick-iteration.patch
Spottedleaf 8ce5219e07 Fix inconsistent chunk sending with vanilla 
Vanilla now loads the proper number of chunks for sending
to players. So, we can finally match their behavior after
all these years.
2023-06-08 17:45:54 -07:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Thu, 7 May 2020 05:48:54 -0700
Subject: [PATCH] Optimise chunk tick iteration
Use a dedicated list of entity ticking chunks to reduce the cost
diff --git a/src/main/java/net/minecraft/server/level/ChunkHolder.java b/src/main/java/net/minecraft/server/level/ChunkHolder.java
index 4164204ba80f68a768de0ed1721c6447b972a631..4ae1ba645d9fdc1eb6d5a3e4f8ceed9b4841e003 100644
--- a/src/main/java/net/minecraft/server/level/ChunkHolder.java
+++ b/src/main/java/net/minecraft/server/level/ChunkHolder.java
@@ -84,6 +84,11 @@ public class ChunkHolder {
this.playersInMobSpawnRange = this.chunkMap.playerMobSpawnMap.getObjectsInRange(key);
this.playersInChunkTickRange = this.chunkMap.playerChunkTickRangeMap.getObjectsInRange(key);
// Paper end - optimise anyPlayerCloseEnoughForSpawning
+ // Paper start - optimise chunk tick iteration
+ if (this.needsBroadcastChanges()) {
+ this.chunkMap.needsChangeBroadcasting.add(this);
+ }
+ // Paper end - optimise chunk tick iteration
}
public void onChunkRemove() {
@@ -91,6 +96,11 @@ public class ChunkHolder {
this.playersInMobSpawnRange = null;
this.playersInChunkTickRange = null;
// Paper end - optimise anyPlayerCloseEnoughForSpawning
+ // Paper start - optimise chunk tick iteration
+ if (this.needsBroadcastChanges()) {
+ this.chunkMap.needsChangeBroadcasting.remove(this);
+ }
+ // Paper end - optimise chunk tick iteration
}
// Paper end
@@ -230,7 +240,7 @@ public class ChunkHolder {
if (i < 0 || i >= this.changedBlocksPerSection.length) return; // CraftBukkit - SPIGOT-6086, SPIGOT-6296
if (this.changedBlocksPerSection[i] == null) {
- this.hasChangedSections = true;
+ this.hasChangedSections = true; this.addToBroadcastMap(); // Paper - optimise chunk tick iteration
this.changedBlocksPerSection[i] = new ShortOpenHashSet();
}
@@ -254,6 +264,7 @@ public class ChunkHolder {
int k = this.lightEngine.getMaxLightSection();
if (y >= j && y <= k) {
+ this.addToBroadcastMap(); // Paper - optimise chunk tick iteration
int l = y - j;
if (lightType == LightLayer.SKY) {
@@ -268,8 +279,19 @@ public class ChunkHolder {
}
}
+ // Paper start - optimise chunk tick iteration
+ public final boolean needsBroadcastChanges() {
+ return this.hasChangedSections || !this.skyChangedLightSectionFilter.isEmpty() || !this.blockChangedLightSectionFilter.isEmpty();
+ }
+
+ private void addToBroadcastMap() {
+ org.spigotmc.AsyncCatcher.catchOp("ChunkHolder update");
+ this.chunkMap.needsChangeBroadcasting.add(this);
+ }
+ // Paper end - optimise chunk tick iteration
+
public void broadcastChanges(LevelChunk chunk) {
- if (this.hasChangedSections || !this.skyChangedLightSectionFilter.isEmpty() || !this.blockChangedLightSectionFilter.isEmpty()) {
+ if (this.needsBroadcastChanges()) { // Paper - moved into above, other logic needs to call
Level world = chunk.getLevel();
List list;
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index 13df88938d9fe7471806d6a7ba7c00143d89b411..d9ef2a44e2e9f1ce32589638fad3d305dadb4cce 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -115,6 +115,8 @@ import org.bukkit.craftbukkit.generator.CustomChunkGenerator;
import org.bukkit.entity.Player;
// CraftBukkit end
+import it.unimi.dsi.fastutil.objects.ReferenceOpenHashSet; // Paper
+
public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider {
private static final byte CHUNK_TYPE_REPLACEABLE = -1;
@@ -152,6 +154,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
private final Queue<Runnable> unloadQueue;
int viewDistance;
public final com.destroystokyo.paper.util.misc.PlayerAreaMap playerMobDistanceMap; // Paper
+ public final ReferenceOpenHashSet<ChunkHolder> needsChangeBroadcasting = new ReferenceOpenHashSet<>();
// Paper - rewrite chunk system
diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
index 5c5fe2087a7617324ab8e18389e3ffa9ac413026..828de28f2777e2477a9c6545c8af96c4ca4e352b 100644
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
@@ -48,6 +48,7 @@ import net.minecraft.world.level.levelgen.structure.templatesystem.StructureTemp
import net.minecraft.world.level.storage.DimensionDataStorage;
import net.minecraft.world.level.storage.LevelData;
import net.minecraft.world.level.storage.LevelStorageSource;
+import it.unimi.dsi.fastutil.objects.ReferenceOpenHashSet; // Paper
public class ServerChunkCache extends ChunkSource {
@@ -574,42 +575,59 @@ public class ServerChunkCache extends ChunkSource {
this.lastSpawnState = spawnercreature_d;
gameprofilerfiller.popPush("filteringLoadedChunks");
- List<ServerChunkCache.ChunkAndHolder> list = Lists.newArrayListWithCapacity(l);
- Iterator iterator = this.chunkMap.getChunks().iterator();
+ // Paper - moved down
this.level.timings.chunkTicks.startTiming(); // Paper
- while (iterator.hasNext()) {
- ChunkHolder playerchunk = (ChunkHolder) iterator.next();
- LevelChunk chunk = playerchunk.getTickingChunk();
-
- if (chunk != null) {
- list.add(new ServerChunkCache.ChunkAndHolder(chunk, playerchunk));
- }
- }
+ // Paper - moved down
gameprofilerfiller.popPush("spawnAndTick");
boolean flag2 = this.level.getGameRules().getBoolean(GameRules.RULE_DOMOBSPAWNING) && !this.level.players().isEmpty(); // CraftBukkit
- Collections.shuffle(list);
+ // Paper - only shuffle if per-player mob spawning is disabled
// Paper - moved natural spawn event up
- Iterator iterator1 = list.iterator();
+ // Paper start - optimise chunk tick iteratio
+ Iterator<LevelChunk> iterator1;
+ if (this.level.paperConfig().entities.spawning.perPlayerMobSpawns) {
+ iterator1 = this.entityTickingChunks.iterator();
+ } else {
+ iterator1 = this.entityTickingChunks.unsafeIterator();
+ List<LevelChunk> shuffled = Lists.newArrayListWithCapacity(this.entityTickingChunks.size());
+ while (iterator1.hasNext()) {
+ shuffled.add(iterator1.next());
+ }
+ Collections.shuffle(shuffled);
+ iterator1 = shuffled.iterator();
+ }
+ try {
while (iterator1.hasNext()) {
- ServerChunkCache.ChunkAndHolder chunkproviderserver_a = (ServerChunkCache.ChunkAndHolder) iterator1.next();
- LevelChunk chunk1 = chunkproviderserver_a.chunk;
+ LevelChunk chunk1 = iterator1.next();
+ ChunkHolder holder = chunk1.playerChunk;
+ if (holder != null) {
+ // Paper - move down
+ // Paper end - optimise chunk tick iteration
ChunkPos chunkcoordintpair = chunk1.getPos();
- if (this.level.isNaturalSpawningAllowed(chunkcoordintpair) && this.chunkMap.anyPlayerCloseEnoughForSpawning(chunkproviderserver_a.holder, chunkcoordintpair, false)) { // Paper - optimise anyPlayerCloseEnoughForSpawning
+ if ((true || this.level.isNaturalSpawningAllowed(chunkcoordintpair)) && this.chunkMap.anyPlayerCloseEnoughForSpawning(holder, chunkcoordintpair, false)) { // Paper - optimise anyPlayerCloseEnoughForSpawning // Paper - the chunk is known ticking
chunk1.incrementInhabitedTime(j);
- if (flag2 && (this.spawnEnemies || this.spawnFriendlies) && this.level.getWorldBorder().isWithinBounds(chunkcoordintpair) && this.chunkMap.anyPlayerCloseEnoughForSpawning(chunkproviderserver_a.holder, chunkcoordintpair, true)) { // Spigot // Paper - optimise anyPlayerCloseEnoughForSpawning
+ if (flag2 && (this.spawnEnemies || this.spawnFriendlies) && this.level.getWorldBorder().isWithinBounds(chunkcoordintpair) && this.chunkMap.anyPlayerCloseEnoughForSpawning(holder, chunkcoordintpair, true)) { // Spigot // Paper - optimise anyPlayerCloseEnoughForSpawning & optimise chunk tick iteration
NaturalSpawner.spawnForChunk(this.level, chunk1, spawnercreature_d, this.spawnFriendlies, this.spawnEnemies, flag1);
}
- if (this.level.shouldTickBlocksAt(chunkcoordintpair.toLong())) {
+ if (true || this.level.shouldTickBlocksAt(chunkcoordintpair.toLong())) { // Paper - the chunk is known ticking
this.level.tickChunk(chunk1, k);
}
}
+ // Paper start - optimise chunk tick iteration
+ }
+ }
+
+ } finally {
+ if (iterator1 instanceof io.papermc.paper.util.maplist.IteratorSafeOrderedReferenceSet.Iterator safeIterator) {
+ safeIterator.finishedIterating();
+ }
}
+ // Paper end - optimise chunk tick iteration
this.level.timings.chunkTicks.stopTiming(); // Paper
gameprofilerfiller.popPush("customSpawners");
if (flag2) {
@@ -617,15 +635,24 @@ public class ServerChunkCache extends ChunkSource {
this.level.tickCustomSpawners(this.spawnEnemies, this.spawnFriendlies);
} // Paper - timings
}
-
- gameprofilerfiller.popPush("broadcast");
- list.forEach((chunkproviderserver_a1) -> {
- this.level.timings.broadcastChunkUpdates.startTiming(); // Paper - timing
- chunkproviderserver_a1.holder.broadcastChanges(chunkproviderserver_a1.chunk);
- this.level.timings.broadcastChunkUpdates.stopTiming(); // Paper - timing
- });
gameprofilerfiller.pop();
+ // Paper start - use set of chunks requiring updates, rather than iterating every single one loaded
+ gameprofilerfiller.popPush("broadcast");
+ this.level.timings.broadcastChunkUpdates.startTiming(); // Paper - timing
+ if (!this.chunkMap.needsChangeBroadcasting.isEmpty()) {
+ ReferenceOpenHashSet<ChunkHolder> copy = this.chunkMap.needsChangeBroadcasting.clone();
+ this.chunkMap.needsChangeBroadcasting.clear();
+ for (ChunkHolder holder : copy) {
+ holder.broadcastChanges(holder.getFullChunkNowUnchecked()); // LevelChunks are NEVER unloaded
+ if (holder.needsBroadcastChanges()) {
+ // I DON'T want to KNOW what DUMB plugins might be doing.
+ this.chunkMap.needsChangeBroadcasting.add(holder);
+ }
+ }
+ }
+ this.level.timings.broadcastChunkUpdates.stopTiming(); // Paper - timing
gameprofilerfiller.pop();
+ // Paper end - use set of chunks requiring updates, rather than iterating every single one loaded
this.chunkMap.tick();
}
}
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