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Paper/patches/server/0860-Replace-ticket-level-propagator.patch
Nassim Jahnke 1358d1e914
Updated Upstream (CraftBukkit/Spigot) (#7580) 
Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
881e06e5 PR-725: Add Item Unlimited Lifetime APIs

CraftBukkit Changes:
74c08312 SPIGOT-6962: Call EntityChangeBlockEvent when when FallingBlockEntity starts to fall
64db5126 SPIGOT-6959: Make /loot command ignore empty items for spawn
2d760831 Increase outdated build delay
9ed7e4fb SPIGOT-6138, SPIGOT-6415: Don't call CreatureSpawnEvent after cross-dimensional travel
fc4ad813 SPIGOT-6895: Trees grown with applyBoneMeal() don't fire the StructureGrowthEvent
59733a2e SPIGOT-6961: Actually return a copy of the ItemMeta

Spigot Changes:
ffceeae3 SPIGOT-6956: Drop unload queue patch as attempt at fixing stop issue
e19ddabd PR-1011: Add Item Unlimited Lifetime APIs
34d40b0e SPIGOT-2942: give command fires PlayerDropItemEvent, cancelling it causes Item Duplication
2022-03-13 08:47:54 +01:00

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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 16:25:42 -0700
Subject: [PATCH] Replace ticket level propagator
Mojang's propagator is slow, and this isn't surprising
given it's built on the same utilities the vanilla light engine
is built on. The simple propagator I wrote is approximately 4x
faster when simulating player movement. For a long time timing
reports have shown this function take up significant tick, (
approx 10% or more), and async sampling data shows the level
propagation alone takes up a significant amount. So this
should help with that. A big side effect is that mid-tick
will be more effective, since more time will be allocated
to actually processing chunk tasks vs the ticket level updates.
diff --git a/src/main/java/net/minecraft/server/level/DistanceManager.java b/src/main/java/net/minecraft/server/level/DistanceManager.java
index 3542b8b347b9a142c53f300251a05a11e421c36f..2c5cf08e16669d5be8ba7d6e3f9282c74f9ea295 100644
--- a/src/main/java/net/minecraft/server/level/DistanceManager.java
+++ b/src/main/java/net/minecraft/server/level/DistanceManager.java
@@ -38,6 +38,7 @@ import net.minecraft.world.level.chunk.ChunkStatus;
import net.minecraft.world.level.chunk.LevelChunk;
import org.slf4j.Logger;
+import it.unimi.dsi.fastutil.longs.Long2IntLinkedOpenHashMap; // Paper
public abstract class DistanceManager {
static final Logger LOGGER = LogUtils.getLogger();
@@ -48,7 +49,7 @@ public abstract class DistanceManager {
private static final int BLOCK_TICKING_LEVEL_THRESHOLD = 33;
final Long2ObjectMap<ObjectSet<ServerPlayer>> playersPerChunk = new Long2ObjectOpenHashMap();
public final Long2ObjectOpenHashMap<SortedArraySet<Ticket<?>>> tickets = new Long2ObjectOpenHashMap();
- private final DistanceManager.ChunkTicketTracker ticketTracker = new DistanceManager.ChunkTicketTracker();
+ //private final DistanceManager.ChunkTicketTracker ticketTracker = new DistanceManager.ChunkTicketTracker(); // Paper - replace ticket level propagator
public static final int MOB_SPAWN_RANGE = 8; // private final ChunkMapDistance.b f = new ChunkMapDistance.b(8); // Paper - no longer used
//private final TickingTracker tickingTicketsTracker = new TickingTracker(); // Paper - no longer used
//private final DistanceManager.PlayerTicketTracker playerTicketManager = new DistanceManager.PlayerTicketTracker(33); // Paper - no longer used
@@ -83,6 +84,46 @@ public abstract class DistanceManager {
this.chunkMap = chunkMap; // Paper
}
+ // Paper start - replace ticket level propagator
+ protected final Long2IntLinkedOpenHashMap ticketLevelUpdates = new Long2IntLinkedOpenHashMap() {
+ @Override
+ protected void rehash(int newN) {
+ // no downsizing allowed
+ if (newN < this.n) {
+ return;
+ }
+ super.rehash(newN);
+ }
+ };
+ protected final io.papermc.paper.util.misc.Delayed8WayDistancePropagator2D ticketLevelPropagator = new io.papermc.paper.util.misc.Delayed8WayDistancePropagator2D(
+ (long coordinate, byte oldLevel, byte newLevel) -> {
+ DistanceManager.this.ticketLevelUpdates.putAndMoveToLast(coordinate, convertBetweenTicketLevels(newLevel));
+ }
+ );
+ // function for converting between ticket levels and propagator levels and vice versa
+ // the problem is the ticket level propagator will propagate from a set source down to zero, whereas mojang expects
+ // levels to propagate from a set value up to a maximum value. so we need to convert the levels we put into the propagator
+ // and the levels we get out of the propagator
+
+ // this maps so that GOLDEN_TICKET + 1 will be 0 in the propagator, GOLDEN_TICKET will be 1, and so on
+ // we need GOLDEN_TICKET+1 as 0 because anything >= GOLDEN_TICKET+1 should be unloaded
+ public static int convertBetweenTicketLevels(final int level) {
+ return ChunkMap.MAX_CHUNK_DISTANCE - level + 1;
+ }
+
+ protected final int getPropagatedTicketLevel(final long coordinate) {
+ return convertBetweenTicketLevels(this.ticketLevelPropagator.getLevel(coordinate));
+ }
+
+ protected final void updateTicketLevel(final long coordinate, final int ticketLevel) {
+ if (ticketLevel > ChunkMap.MAX_CHUNK_DISTANCE) {
+ this.ticketLevelPropagator.removeSource(coordinate);
+ } else {
+ this.ticketLevelPropagator.setSource(coordinate, convertBetweenTicketLevels(ticketLevel));
+ }
+ }
+ // Paper end - replace ticket level propagator
+
protected void purgeStaleTickets() {
++this.ticketTickCounter;
ObjectIterator objectiterator = this.tickets.long2ObjectEntrySet().fastIterator();
@@ -117,7 +158,7 @@ public abstract class DistanceManager {
}
if (flag) {
- this.ticketTracker.update(entry.getLongKey(), DistanceManager.getTicketLevelAt((SortedArraySet) entry.getValue()), false);
+ this.updateTicketLevel(entry.getLongKey(), getTicketLevelAt(entry.getValue())); // Paper - replace ticket level propagator
}
if (((SortedArraySet) entry.getValue()).isEmpty()) {
@@ -140,61 +181,94 @@ public abstract class DistanceManager {
@Nullable
protected abstract ChunkHolder updateChunkScheduling(long pos, int level, @Nullable ChunkHolder holder, int k);
+ protected long ticketLevelUpdateCount; // Paper - replace ticket level propagator
public boolean runAllUpdates(ChunkMap chunkStorage) {
//this.f.a(); // Paper - no longer used
//this.tickingTicketsTracker.runAllUpdates(); // Paper - no longer used
org.spigotmc.AsyncCatcher.catchOp("DistanceManagerTick"); // Paper
//this.playerTicketManager.runAllUpdates(); // Paper - no longer used
- int i = Integer.MAX_VALUE - this.ticketTracker.runDistanceUpdates(Integer.MAX_VALUE);
- boolean flag = i != 0;
+ boolean flag = this.ticketLevelPropagator.propagateUpdates(); // Paper - replace ticket level propagator
if (flag) {
;
}
- // Paper start
- if (!this.pendingChunkUpdates.isEmpty()) {
- this.pollingPendingChunkUpdates = true; try { // Paper - Chunk priority
- while(!this.pendingChunkUpdates.isEmpty()) {
- ChunkHolder remove = this.pendingChunkUpdates.remove();
- remove.isUpdateQueued = false;
- remove.updateFutures(chunkStorage, this.mainThreadExecutor);
- }
- } finally { this.pollingPendingChunkUpdates = false; } // Paper - Chunk priority
- // Paper end
- return true;
- } else {
- if (!this.ticketsToRelease.isEmpty()) {
- LongIterator longiterator = this.ticketsToRelease.iterator();
+ // Paper start - replace level propagator
+ ticket_update_loop:
+ while (!this.ticketLevelUpdates.isEmpty()) {
+ flag = true;
- while (longiterator.hasNext()) {
- long j = longiterator.nextLong();
+ boolean oldPolling = this.pollingPendingChunkUpdates;
+ this.pollingPendingChunkUpdates = true;
+ try {
+ for (java.util.Iterator<Long2IntMap.Entry> iterator = this.ticketLevelUpdates.long2IntEntrySet().fastIterator(); iterator.hasNext();) {
+ Long2IntMap.Entry entry = iterator.next();
+ long key = entry.getLongKey();
+ int newLevel = entry.getIntValue();
+ ChunkHolder chunk = this.getChunk(key);
+
+ if (chunk == null && newLevel > ChunkMap.MAX_CHUNK_DISTANCE) {
+ // not loaded and it shouldn't be loaded!
+ continue;
+ }
- if (this.getTickets(j).stream().anyMatch((ticket) -> {
- return ticket.getType() == TicketType.PLAYER;
- })) {
- ChunkHolder playerchunk = chunkStorage.getUpdatingChunkIfPresent(j);
+ int currentLevel = chunk == null ? ChunkMap.MAX_CHUNK_DISTANCE + 1 : chunk.getTicketLevel();
- if (playerchunk == null) {
- throw new IllegalStateException();
+ if (currentLevel == newLevel) {
+ // nothing to do
+ continue;
+ }
+
+ this.updateChunkScheduling(key, newLevel, chunk, currentLevel);
+ }
+
+ long recursiveCheck = ++this.ticketLevelUpdateCount;
+ while (!this.ticketLevelUpdates.isEmpty()) {
+ long key = this.ticketLevelUpdates.firstLongKey();
+ int newLevel = this.ticketLevelUpdates.removeFirstInt();
+ ChunkHolder chunk = this.getChunk(key);
+
+ if (chunk == null) {
+ if (newLevel <= ChunkMap.MAX_CHUNK_DISTANCE) {
+ throw new IllegalStateException("Expected chunk holder to be created");
}
+ // not loaded and it shouldn't be loaded!
+ continue;
+ }
- CompletableFuture<Either<LevelChunk, ChunkHolder.ChunkLoadingFailure>> completablefuture = playerchunk.getEntityTickingChunkFuture();
+ int currentLevel = chunk.oldTicketLevel;
- completablefuture.thenAccept((either) -> {
- this.mainThreadExecutor.execute(() -> {
- this.ticketThrottlerReleaser.tell(ChunkTaskPriorityQueueSorter.release(() -> {
- }, j, false));
- });
- });
+ if (currentLevel == newLevel) {
+ // nothing to do
+ continue;
+ }
+
+ chunk.updateFutures(chunkStorage, this.mainThreadExecutor);
+ if (recursiveCheck != this.ticketLevelUpdateCount) {
+ // back to the start, we must create player chunks and update the ticket level fields before
+ // processing the actual level updates
+ continue ticket_update_loop;
}
}
- this.ticketsToRelease.clear();
- }
+ for (;;) {
+ if (recursiveCheck != this.ticketLevelUpdateCount) {
+ continue ticket_update_loop;
+ }
+ ChunkHolder pendingUpdate = this.pendingChunkUpdates.poll();
+ if (pendingUpdate == null) {
+ break;
+ }
- return flag;
+ pendingUpdate.updateFutures(chunkStorage, this.mainThreadExecutor);
+ }
+ } finally {
+ this.pollingPendingChunkUpdates = oldPolling;
+ }
}
+
+ return flag;
+ // Paper end - replace level propagator
}
boolean pollingPendingChunkUpdates = false; // Paper - Chunk priority
@@ -206,7 +280,7 @@ public abstract class DistanceManager {
ticket1.setCreatedTick(this.ticketTickCounter);
if (ticket.getTicketLevel() < j) {
- this.ticketTracker.update(i, ticket.getTicketLevel(), true);
+ this.updateTicketLevel(i, ticket.getTicketLevel()); // Paper - replace ticket level propagator
}
return ticket == ticket1; // CraftBukkit
@@ -250,7 +324,7 @@ public abstract class DistanceManager {
// Paper start - Chunk priority
int newLevel = getTicketLevelAt(arraysetsorted);
if (newLevel > oldLevel) {
- this.ticketTracker.update(i, newLevel, false);
+ this.updateTicketLevel(i, newLevel); // Paper // Paper - replace ticket level propagator
}
// Paper end
return removed; // CraftBukkit
@@ -587,7 +661,7 @@ public abstract class DistanceManager {
SortedArraySet<Ticket<?>> tickets = entry.getValue();
if (tickets.remove(target)) {
// copied from removeTicket
- this.ticketTracker.update(entry.getLongKey(), DistanceManager.getTicketLevelAt(tickets), false);
+ this.updateTicketLevel(entry.getLongKey(), getTicketLevelAt(tickets)); // Paper - replace ticket level propagator
// can't use entry after it's removed
if (tickets.isEmpty()) {
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