250 lines
13 KiB
Diff
250 lines
13 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Sun, 21 Mar 2021 16:25:42 -0700
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Subject: [PATCH] Replace ticket level propagator
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Mojang's propagator is slow, and this isn't surprising
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given it's built on the same utilities the vanilla light engine
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is built on. The simple propagator I wrote is approximately 4x
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faster when simulating player movement. For a long time timing
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reports have shown this function take up significant tick, (
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approx 10% or more), and async sampling data shows the level
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propagation alone takes up a significant amount. So this
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should help with that. A big side effect is that mid-tick
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will be more effective, since more time will be allocated
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to actually processing chunk tasks vs the ticket level updates.
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diff --git a/src/main/java/net/minecraft/server/level/DistanceManager.java b/src/main/java/net/minecraft/server/level/DistanceManager.java
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index 3542b8b347b9a142c53f300251a05a11e421c36f..2c5cf08e16669d5be8ba7d6e3f9282c74f9ea295 100644
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--- a/src/main/java/net/minecraft/server/level/DistanceManager.java
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+++ b/src/main/java/net/minecraft/server/level/DistanceManager.java
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@@ -38,6 +38,7 @@ import net.minecraft.world.level.chunk.ChunkStatus;
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import net.minecraft.world.level.chunk.LevelChunk;
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import org.slf4j.Logger;
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+import it.unimi.dsi.fastutil.longs.Long2IntLinkedOpenHashMap; // Paper
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public abstract class DistanceManager {
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static final Logger LOGGER = LogUtils.getLogger();
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@@ -48,7 +49,7 @@ public abstract class DistanceManager {
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private static final int BLOCK_TICKING_LEVEL_THRESHOLD = 33;
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final Long2ObjectMap<ObjectSet<ServerPlayer>> playersPerChunk = new Long2ObjectOpenHashMap();
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public final Long2ObjectOpenHashMap<SortedArraySet<Ticket<?>>> tickets = new Long2ObjectOpenHashMap();
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- private final DistanceManager.ChunkTicketTracker ticketTracker = new DistanceManager.ChunkTicketTracker();
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+ //private final DistanceManager.ChunkTicketTracker ticketTracker = new DistanceManager.ChunkTicketTracker(); // Paper - replace ticket level propagator
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public static final int MOB_SPAWN_RANGE = 8; // private final ChunkMapDistance.b f = new ChunkMapDistance.b(8); // Paper - no longer used
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//private final TickingTracker tickingTicketsTracker = new TickingTracker(); // Paper - no longer used
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//private final DistanceManager.PlayerTicketTracker playerTicketManager = new DistanceManager.PlayerTicketTracker(33); // Paper - no longer used
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@@ -83,6 +84,46 @@ public abstract class DistanceManager {
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this.chunkMap = chunkMap; // Paper
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}
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+ // Paper start - replace ticket level propagator
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+ protected final Long2IntLinkedOpenHashMap ticketLevelUpdates = new Long2IntLinkedOpenHashMap() {
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+ @Override
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+ protected void rehash(int newN) {
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+ // no downsizing allowed
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+ if (newN < this.n) {
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+ return;
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+ }
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+ super.rehash(newN);
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+ }
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+ };
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+ protected final io.papermc.paper.util.misc.Delayed8WayDistancePropagator2D ticketLevelPropagator = new io.papermc.paper.util.misc.Delayed8WayDistancePropagator2D(
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+ (long coordinate, byte oldLevel, byte newLevel) -> {
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+ DistanceManager.this.ticketLevelUpdates.putAndMoveToLast(coordinate, convertBetweenTicketLevels(newLevel));
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+ }
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+ );
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+ // function for converting between ticket levels and propagator levels and vice versa
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+ // the problem is the ticket level propagator will propagate from a set source down to zero, whereas mojang expects
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+ // levels to propagate from a set value up to a maximum value. so we need to convert the levels we put into the propagator
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+ // and the levels we get out of the propagator
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+
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+ // this maps so that GOLDEN_TICKET + 1 will be 0 in the propagator, GOLDEN_TICKET will be 1, and so on
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+ // we need GOLDEN_TICKET+1 as 0 because anything >= GOLDEN_TICKET+1 should be unloaded
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+ public static int convertBetweenTicketLevels(final int level) {
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+ return ChunkMap.MAX_CHUNK_DISTANCE - level + 1;
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+ }
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+
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+ protected final int getPropagatedTicketLevel(final long coordinate) {
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+ return convertBetweenTicketLevels(this.ticketLevelPropagator.getLevel(coordinate));
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+ }
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+
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+ protected final void updateTicketLevel(final long coordinate, final int ticketLevel) {
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+ if (ticketLevel > ChunkMap.MAX_CHUNK_DISTANCE) {
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+ this.ticketLevelPropagator.removeSource(coordinate);
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+ } else {
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+ this.ticketLevelPropagator.setSource(coordinate, convertBetweenTicketLevels(ticketLevel));
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+ }
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+ }
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+ // Paper end - replace ticket level propagator
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+
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protected void purgeStaleTickets() {
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++this.ticketTickCounter;
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ObjectIterator objectiterator = this.tickets.long2ObjectEntrySet().fastIterator();
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@@ -117,7 +158,7 @@ public abstract class DistanceManager {
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}
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if (flag) {
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- this.ticketTracker.update(entry.getLongKey(), DistanceManager.getTicketLevelAt((SortedArraySet) entry.getValue()), false);
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+ this.updateTicketLevel(entry.getLongKey(), getTicketLevelAt(entry.getValue())); // Paper - replace ticket level propagator
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}
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if (((SortedArraySet) entry.getValue()).isEmpty()) {
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@@ -140,61 +181,94 @@ public abstract class DistanceManager {
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@Nullable
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protected abstract ChunkHolder updateChunkScheduling(long pos, int level, @Nullable ChunkHolder holder, int k);
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+ protected long ticketLevelUpdateCount; // Paper - replace ticket level propagator
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public boolean runAllUpdates(ChunkMap chunkStorage) {
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//this.f.a(); // Paper - no longer used
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//this.tickingTicketsTracker.runAllUpdates(); // Paper - no longer used
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org.spigotmc.AsyncCatcher.catchOp("DistanceManagerTick"); // Paper
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//this.playerTicketManager.runAllUpdates(); // Paper - no longer used
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- int i = Integer.MAX_VALUE - this.ticketTracker.runDistanceUpdates(Integer.MAX_VALUE);
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- boolean flag = i != 0;
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+ boolean flag = this.ticketLevelPropagator.propagateUpdates(); // Paper - replace ticket level propagator
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if (flag) {
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;
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}
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- // Paper start
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- if (!this.pendingChunkUpdates.isEmpty()) {
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- this.pollingPendingChunkUpdates = true; try { // Paper - Chunk priority
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- while(!this.pendingChunkUpdates.isEmpty()) {
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- ChunkHolder remove = this.pendingChunkUpdates.remove();
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- remove.isUpdateQueued = false;
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- remove.updateFutures(chunkStorage, this.mainThreadExecutor);
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- }
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- } finally { this.pollingPendingChunkUpdates = false; } // Paper - Chunk priority
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- // Paper end
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- return true;
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- } else {
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- if (!this.ticketsToRelease.isEmpty()) {
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- LongIterator longiterator = this.ticketsToRelease.iterator();
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+ // Paper start - replace level propagator
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+ ticket_update_loop:
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+ while (!this.ticketLevelUpdates.isEmpty()) {
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+ flag = true;
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- while (longiterator.hasNext()) {
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- long j = longiterator.nextLong();
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+ boolean oldPolling = this.pollingPendingChunkUpdates;
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+ this.pollingPendingChunkUpdates = true;
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+ try {
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+ for (java.util.Iterator<Long2IntMap.Entry> iterator = this.ticketLevelUpdates.long2IntEntrySet().fastIterator(); iterator.hasNext();) {
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+ Long2IntMap.Entry entry = iterator.next();
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+ long key = entry.getLongKey();
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+ int newLevel = entry.getIntValue();
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+ ChunkHolder chunk = this.getChunk(key);
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+
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+ if (chunk == null && newLevel > ChunkMap.MAX_CHUNK_DISTANCE) {
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+ // not loaded and it shouldn't be loaded!
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+ continue;
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+ }
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- if (this.getTickets(j).stream().anyMatch((ticket) -> {
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- return ticket.getType() == TicketType.PLAYER;
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- })) {
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- ChunkHolder playerchunk = chunkStorage.getUpdatingChunkIfPresent(j);
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+ int currentLevel = chunk == null ? ChunkMap.MAX_CHUNK_DISTANCE + 1 : chunk.getTicketLevel();
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- if (playerchunk == null) {
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- throw new IllegalStateException();
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+ if (currentLevel == newLevel) {
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+ // nothing to do
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+ continue;
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+ }
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+
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+ this.updateChunkScheduling(key, newLevel, chunk, currentLevel);
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+ }
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+
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+ long recursiveCheck = ++this.ticketLevelUpdateCount;
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+ while (!this.ticketLevelUpdates.isEmpty()) {
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+ long key = this.ticketLevelUpdates.firstLongKey();
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+ int newLevel = this.ticketLevelUpdates.removeFirstInt();
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+ ChunkHolder chunk = this.getChunk(key);
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+
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+ if (chunk == null) {
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+ if (newLevel <= ChunkMap.MAX_CHUNK_DISTANCE) {
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+ throw new IllegalStateException("Expected chunk holder to be created");
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}
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+ // not loaded and it shouldn't be loaded!
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+ continue;
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+ }
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- CompletableFuture<Either<LevelChunk, ChunkHolder.ChunkLoadingFailure>> completablefuture = playerchunk.getEntityTickingChunkFuture();
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+ int currentLevel = chunk.oldTicketLevel;
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- completablefuture.thenAccept((either) -> {
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- this.mainThreadExecutor.execute(() -> {
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- this.ticketThrottlerReleaser.tell(ChunkTaskPriorityQueueSorter.release(() -> {
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- }, j, false));
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- });
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- });
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+ if (currentLevel == newLevel) {
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+ // nothing to do
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+ continue;
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+ }
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+
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+ chunk.updateFutures(chunkStorage, this.mainThreadExecutor);
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+ if (recursiveCheck != this.ticketLevelUpdateCount) {
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+ // back to the start, we must create player chunks and update the ticket level fields before
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+ // processing the actual level updates
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+ continue ticket_update_loop;
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}
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}
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- this.ticketsToRelease.clear();
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- }
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+ for (;;) {
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+ if (recursiveCheck != this.ticketLevelUpdateCount) {
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+ continue ticket_update_loop;
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+ }
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+ ChunkHolder pendingUpdate = this.pendingChunkUpdates.poll();
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+ if (pendingUpdate == null) {
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+ break;
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+ }
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- return flag;
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+ pendingUpdate.updateFutures(chunkStorage, this.mainThreadExecutor);
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+ }
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+ } finally {
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+ this.pollingPendingChunkUpdates = oldPolling;
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+ }
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}
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+
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+ return flag;
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+ // Paper end - replace level propagator
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}
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boolean pollingPendingChunkUpdates = false; // Paper - Chunk priority
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@@ -206,7 +280,7 @@ public abstract class DistanceManager {
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ticket1.setCreatedTick(this.ticketTickCounter);
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if (ticket.getTicketLevel() < j) {
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- this.ticketTracker.update(i, ticket.getTicketLevel(), true);
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+ this.updateTicketLevel(i, ticket.getTicketLevel()); // Paper - replace ticket level propagator
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}
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return ticket == ticket1; // CraftBukkit
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@@ -250,7 +324,7 @@ public abstract class DistanceManager {
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// Paper start - Chunk priority
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int newLevel = getTicketLevelAt(arraysetsorted);
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if (newLevel > oldLevel) {
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- this.ticketTracker.update(i, newLevel, false);
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+ this.updateTicketLevel(i, newLevel); // Paper // Paper - replace ticket level propagator
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}
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// Paper end
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return removed; // CraftBukkit
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@@ -587,7 +661,7 @@ public abstract class DistanceManager {
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SortedArraySet<Ticket<?>> tickets = entry.getValue();
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if (tickets.remove(target)) {
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// copied from removeTicket
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- this.ticketTracker.update(entry.getLongKey(), DistanceManager.getTicketLevelAt(tickets), false);
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+ this.updateTicketLevel(entry.getLongKey(), getTicketLevelAt(tickets)); // Paper - replace ticket level propagator
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// can't use entry after it's removed
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if (tickets.isEmpty()) {
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