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Rewrite chunk system (#8177)

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Patch documentation to come

Issues with the old system that are fixed now:
- World generation does not scale with cpu cores effectively.
- Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps.
- Unreliable prioritisation of chunk gen/load calls that block the main thread.
- Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved.
- Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal.
- Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles.

The above list is not complete. The patch documentation will complete it.

New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil.

Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft.

The old legacy chunk system patches have been moved to the removed folder in case we need them again.
This commit is contained in:
Spottedleaf
2022-09-26 01:02:51 -07:00
parent 614f528234
commit 0f1a8717e8
122 changed files with 18921 additions and 12279 deletions
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108
patches/server/Use-distance-map-to-optimise-entity-tracker.patch
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@@ -40,46 +40,49 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ // Paper end - use distance map to optimise tracker
void addPlayerToDistanceMaps(ServerPlayer player) {
int chunkX = MCUtil.getChunkCoordinate(player.getX());
int chunkZ = MCUtil.getChunkCoordinate(player.getZ());
this.playerChunkManager.addPlayer(player); // Paper - replace chunk loader
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
this.playerMobDistanceMap.add(player, chunkX, chunkZ, net.minecraft.server.ChunkSystem.getTickViewDistance(player));
}
// Paper end - per player mob spawning
+ // Paper start - use distance map to optimise entity tracker
+ for (int i = 0, len = TRACKING_RANGE_TYPES.length; i < len; ++i) {
+ com.destroystokyo.paper.util.misc.PlayerAreaMap trackMap = this.playerEntityTrackerTrackMaps[i];
+ int trackRange = this.entityTrackerTrackRanges[i];
+
+ trackMap.add(player, chunkX, chunkZ, Math.min(trackRange, this.getEffectiveViewDistance()));
+ trackMap.add(player, chunkX, chunkZ, Math.min(trackRange, net.minecraft.server.ChunkSystem.getSendViewDistance(player)));
+ }
+ // Paper end - use distance map to optimise entity tracker
// Note: players need to be explicitly added to distance maps before they can be updated
this.playerChunkTickRangeMap.add(player, chunkX, chunkZ, DistanceManager.MOB_SPAWN_RANGE); // Paper - optimise ChunkMap#anyPlayerCloseEnoughForSpawning
// Paper start - per player mob spawning
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}
void removePlayerFromDistanceMaps(ServerPlayer player) {
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
this.playerMobDistanceMap.remove(player);
}
// Paper end - per player mob spawning
+ // Paper start - use distance map to optimise tracker
+ for (int i = 0, len = TRACKING_RANGE_TYPES.length; i < len; ++i) {
+ this.playerEntityTrackerTrackMaps[i].remove(player);
+ }
+ // Paper end - use distance map to optimise tracker
// Paper start - optimise ChunkMap#anyPlayerCloseEnoughForSpawning
this.playerMobSpawnMap.remove(player);
this.playerChunkTickRangeMap.remove(player);
}
void updateMaps(ServerPlayer player) {
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
int chunkX = MCUtil.getChunkCoordinate(player.getX());
int chunkZ = MCUtil.getChunkCoordinate(player.getZ());
// Note: players need to be explicitly added to distance maps before they can be updated
this.playerMobDistanceMap.update(player, chunkX, chunkZ, net.minecraft.server.ChunkSystem.getTickViewDistance(player));
}
// Paper end - per player mob spawning
+ // Paper start - use distance map to optimise entity tracker
+ for (int i = 0, len = TRACKING_RANGE_TYPES.length; i < len; ++i) {
+ com.destroystokyo.paper.util.misc.PlayerAreaMap trackMap = this.playerEntityTrackerTrackMaps[i];
+ int trackRange = this.entityTrackerTrackRanges[i];
+
+ trackMap.update(player, chunkX, chunkZ, Math.min(trackRange, this.getEffectiveViewDistance()));
+ trackMap.update(player, chunkX, chunkZ, Math.min(trackRange, net.minecraft.server.ChunkSystem.getSendViewDistance(player)));
+ }
+ // Paper end - use distance map to optimise entity tracker
this.playerChunkTickRangeMap.update(player, chunkX, chunkZ, DistanceManager.MOB_SPAWN_RANGE); // Paper - optimise ChunkMap#anyPlayerCloseEnoughForSpawning
// Paper start - per player mob spawning
if (this.playerMobDistanceMap != null) {
}
// Paper end
// Paper start
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
this.regionManagers.add(this.dataRegionManager);
// Paper end
@@ -193,49 +196,53 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
List<ServerPlayer> list1 = this.level.players();
ObjectIterator objectiterator = this.entityMap.values().iterator();
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
}));
// Paper end
DebugPackets.sendPoiPacketsForChunk(this.level, chunk.getPos());
List<Entity> list = Lists.newArrayList();
List<Entity> list1 = Lists.newArrayList();
- List<Entity> list = Lists.newArrayList();
- List<Entity> list1 = Lists.newArrayList();
- ObjectIterator objectiterator = this.entityMap.values().iterator();
+ // Paper start - optimise entity tracker
+ // use the chunk entity list, not the whole trackedEntities map...
+ Entity[] entities = chunk.entities.getRawData();
+ for (int i = 0, size = chunk.entities.size(); i < size; ++i) {
+ Entity entity = entities[i];
+ if (entity == player) {
+ continue;
+ }
+ ChunkMap.TrackedEntity tracker = this.entityMap.get(entity.getId());
+ if (tracker != null) { // dumb plugins... move on...
+ tracker.updatePlayer(player);
+ }
-
- while (objectiterator.hasNext()) {
- ChunkMap.TrackedEntity playerchunkmap_entitytracker = (ChunkMap.TrackedEntity) objectiterator.next();
- Entity entity = playerchunkmap_entitytracker.entity;
+ // keep the vanilla logic here - this is REQUIRED or else passengers and their vehicles disappear!
+ // (and god knows what the leash thing is)
-
- if (entity != player && entity.chunkPosition().equals(chunk.getPos())) {
- playerchunkmap_entitytracker.updatePlayer(player);
- if (entity instanceof Mob && ((Mob) entity).getLeashHolder() != null) {
- list.add(entity);
- }
+ if (entity instanceof Mob && ((Mob)entity).getLeashHolder() != null) {
+ list.add(entity);
+ }
-
- if (!entity.getPassengers().isEmpty()) {
- list1.add(entity);
- }
+ if (!entity.getPassengers().isEmpty()) {
+ list1.add(entity);
}
}
+ // Paper end - optimise entity tracker
- }
- }
-
- Iterator iterator;
- Entity entity1;
-
- if (!list.isEmpty()) {
- iterator = list.iterator();
-
- while (iterator.hasNext()) {
- entity1 = (Entity) iterator.next();
- player.connection.send(new ClientboundSetEntityLinkPacket(entity1, ((Mob) entity1).getLeashHolder()));
- }
- }
-
- if (!list1.isEmpty()) {
- iterator = list1.iterator();
-
- while (iterator.hasNext()) {
- entity1 = (Entity) iterator.next();
- player.connection.send(new ClientboundSetPassengersPacket(entity1));
- }
- }
+ // Paper - no longer needed - this was used to account for clients bugging out since they needed a chunk to store entities, but they no longer need a chunk
}
Iterator iterator;
Entity entity1;
@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
this.lastSectionPos = SectionPos.of((EntityAccess) entity);
}
@@ -292,9 +299,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
import net.minecraft.server.level.ServerLevel;
import net.minecraft.server.level.ServerPlayer;
@@ -0,0 +0,0 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource {
}
// Paper end
public boolean updatingSectionStatus = false;
// Paper end
+ // Paper start - optimise entity tracking
+ final org.spigotmc.TrackingRange.TrackingRangeType trackingRangeType = org.spigotmc.TrackingRange.getTrackingRangeType(this);
+
@@ -327,10 +334,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ return chunkMap.playerEntityTrackerTrackMaps[type.ordinal()].getObjectsInRange(MCUtil.getCoordinateKey(this));
+ }
+ // Paper end - optimise entity tracking
+
public Entity(EntityType<?> type, Level world) {
this.id = Entity.ENTITY_COUNTER.incrementAndGet();
this.passengers = ImmutableList.of();
diff --git a/src/main/java/org/spigotmc/TrackingRange.java b/src/main/java/org/spigotmc/TrackingRange.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/spigotmc/TrackingRange.java