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Create 0046-PAPER-Reduce-entity-tracker-updates-on-move.patch

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tr7zw 2020-03-09 20:59:54 +01:00
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patches/server/0046-PAPER-Reduce-entity-tracker-updates-on-move.patch Normal file
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From b8b3b931ccfa1f390db02deb97a830c537284652 Mon Sep 17 00:00:00 2001
From: froobynooby <froobynooby@froobworld.com>
Date: Thu, 20 Feb 2020 15:50:49 +0930
Subject: [PATCH] PAPER Reduce entity tracker updates on move
With this patch, for each player we keep track of a set of
entities that the player is tracking. This is used to split
the entity tracker update logic in the movePlayer method in
PlayerChunkMap in to two parts:
* Full update: Run through all entity trackers and update them
* Partial update: Run through all entity trackers for entities
the player is already tracking and update them
Partial updates will always take less time than full updates,
usually by a considerable amount if players and entities are
spread out over the map. Assuming they are evenly spread,
and given there are x many players, it would be expected to
take 1/x the time of a full update.
Full updates are only run if the following conditions are met:
* It has been 20 ticks since the last full update
* The player has moved over set distance since the last full
update (distance is configurable)
The motivation for the first condition is that the client
sends the server its position once a second, which calls
movePlayer, so at a minimum we want to be sending the player
an updated set of entities it can see every second.
The motivation for the second condition is that looping
through every entity in world to check if it is now within
the tracking range after the player has moved 0.1 blocks is
largely unnecessary. Checking only after the player has moved
1 or 2 blocks is far better for performance, and very unlikely
to give any noticeable side effects.
In testing, this has reduced the time taken for movement
packet processing by up to 4x. Packet processing for movement
packets often show up as a major contributor to TPS loss in
servers with large player counts
---
.../destroystokyo/paper/PaperWorldConfig.java | 5 ++
.../net/minecraft/server/EntityPlayer.java | 4 ++
.../net/minecraft/server/PlayerChunkMap.java | 63 ++++++++++++++++++-
3 files changed, 70 insertions(+), 2 deletions(-)
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 7d408542e..2ae44b230 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -658,4 +658,9 @@ public class PaperWorldConfig {
private void nerfNetherPortalPigmen() {
nerfNetherPortalPigmen = getBoolean("game-mechanics.nerf-pigmen-from-nether-portals", nerfNetherPortalPigmen);
}
+
+ public double trackerUpdateDistance = 1;
+ private void trackeruUpdateDistance() {
+ trackerUpdateDistance = getDouble("tracker-update-distance", trackerUpdateDistance);
+ }
}
diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
index e7bfbc330..43774bc9a 100644
--- a/src/main/java/net/minecraft/server/EntityPlayer.java
+++ b/src/main/java/net/minecraft/server/EntityPlayer.java
@@ -86,6 +86,10 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
public final int[] mobCounts = new int[ENUMCREATURETYPE_TOTAL_ENUMS]; // Paper
public final com.destroystokyo.paper.util.PooledHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> cachedSingleMobDistanceMap;
// Paper end
+ // Paper start - Reduce entity tracker updates on move
+ public Vec3D lastTrackedPosition = new Vec3D(0, 0, 0);
+ public long lastTrackedTick;
+ // Paper end
// CraftBukkit start
public String displayName;
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index 57bea926a..d971a4426 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -133,6 +133,39 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
}
+ // Paper end
+
+ // Paper start - Reduce entity tracker updates on move
+ private double trackerUpdateDistanceSquared;
+ private final Int2ObjectMap<Int2ObjectMap<PlayerChunkMap.EntityTracker>> playerTrackedEntities = new Int2ObjectOpenHashMap();
+ private final Int2ObjectMap<Queue<Integer>> playerTrackedEntitiesRemoveQueue = new Int2ObjectOpenHashMap();
+
+ void flushRemoveQueue(EntityPlayer entityplayer) {
+ Queue<Integer> removeQueue = getPlayerTrackedEntityMapRemoveQueue(entityplayer.getId());
+ Int2ObjectMap<PlayerChunkMap.EntityTracker> entityMap = getPlayerTrackedEntityMap(entityplayer.getId());
+ for (Integer id = removeQueue.poll(); id != null; id = removeQueue.poll()) {
+ entityMap.remove(id);
+ }
+ }
+
+ void flushRemoveQueues() {
+ for (Int2ObjectMap.Entry<Queue<Integer>> entry : playerTrackedEntitiesRemoveQueue.int2ObjectEntrySet()) {
+ Int2ObjectMap entityMap = getPlayerTrackedEntityMap(entry.getKey());
+ Queue<Integer> removeQueue = entry.getValue();
+ for (Integer id = removeQueue.poll(); id != null; id = removeQueue.poll()) {
+ entityMap.remove(id);
+ }
+ }
+ }
+
+ Int2ObjectMap getPlayerTrackedEntityMap(int id) {
+ return playerTrackedEntities.computeIfAbsent(id, i -> new Int2ObjectOpenHashMap());
+ }
+
+ Queue<Integer> getPlayerTrackedEntityMapRemoveQueue(int id) {
+ return playerTrackedEntitiesRemoveQueue.computeIfAbsent(id, i -> new java.util.ArrayDeque<>());
+ }
+
// Paper end
public PlayerChunkMap(WorldServer worldserver, File file, DataFixer datafixer, DefinedStructureManager definedstructuremanager, Executor executor, IAsyncTaskHandler<Runnable> iasynctaskhandler, ILightAccess ilightaccess, ChunkGenerator<?> chunkgenerator, WorldLoadListener worldloadlistener, Supplier<WorldPersistentData> supplier, int i) {
@@ -167,6 +200,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
this.m = new VillagePlace(new File(this.w, "poi"), datafixer, this.world); // Paper
this.setViewDistance(i);
this.playerMobDistanceMap = this.world.paperConfig.perPlayerMobSpawns ? new com.destroystokyo.paper.util.PlayerMobDistanceMap() : null; // Paper
+ this.trackerUpdateDistanceSquared = Math.pow(this.world.paperConfig.trackerUpdateDistance, 2); // Paper
}
public void updatePlayerMobTypeMap(Entity entity) {
@@ -1334,8 +1368,19 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
}
public void movePlayer(EntityPlayer entityplayer) {
- ObjectIterator objectiterator = this.trackedEntities.values().iterator();
+ // Paper start
+ // ObjectIterator objectiterator = this.trackedEntities.values().iterator();
+ ObjectIterator objectiterator;
+ if (MinecraftServer.currentTick - entityplayer.lastTrackedTick >= 20
+ || entityplayer.lastTrackedPosition.distanceSquared(entityplayer.getPositionVector()) >= trackerUpdateDistanceSquared) {
+ entityplayer.lastTrackedPosition = entityplayer.getPositionVector();
+ entityplayer.lastTrackedTick = MinecraftServer.currentTick;
+ objectiterator = this.trackedEntities.values().iterator(); // Update all entity trackers
+ } else {
+ objectiterator = getPlayerTrackedEntityMap(entityplayer.getId()).values().iterator(); // Only update entity trackers for already tracked entities
+ }
+ // Paper end
while (objectiterator.hasNext()) {
PlayerChunkMap.EntityTracker playerchunkmap_entitytracker = (PlayerChunkMap.EntityTracker) objectiterator.next();
@@ -1345,6 +1390,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
playerchunkmap_entitytracker.updatePlayer(entityplayer);
}
}
+ flushRemoveQueues(); // Paper
int i = MathHelper.floor(entityplayer.locX()) >> 4;
int j = MathHelper.floor(entityplayer.locZ()) >> 4;
@@ -1486,12 +1532,21 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
playerchunkmap_entitytracker.clear(entityplayer);
}
+ // Paper start
+ playerTrackedEntities.remove(entityplayer.getId());
+ playerTrackedEntitiesRemoveQueue.remove(entityplayer.getId());
+ // Paper end
}
PlayerChunkMap.EntityTracker playerchunkmap_entitytracker1 = (PlayerChunkMap.EntityTracker) this.trackedEntities.remove(entity.getId());
if (playerchunkmap_entitytracker1 != null) {
playerchunkmap_entitytracker1.a();
+ // Paper start
+ for (EntityPlayer player : playerchunkmap_entitytracker1.trackedPlayers) {
+ getPlayerTrackedEntityMap(player.getId()).remove(playerchunkmap_entitytracker1.tracker.getId());
+ }
+ // Paper end
}
entity.tracker = null; // Paper - We're no longer tracked
}
@@ -1532,7 +1587,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
}
world.timings.tracker2.stopTiming(); // Paper
}
-
+ flushRemoveQueues(); // Paper
}
@@ -1581,6 +1636,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
}
}
}
+ flushRemoveQueue(entityplayer); // Paper
Iterator iterator;
Entity entity1;
@@ -1677,6 +1733,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
org.spigotmc.AsyncCatcher.catchOp("player tracker clear"); // Spigot
if (this.trackedPlayers.remove(entityplayer)) {
this.trackerEntry.a(entityplayer);
+ getPlayerTrackedEntityMap(entityplayer.getId()).remove(this.tracker.getId()); // Paper
}
}
@@ -1713,9 +1770,11 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
if (flag1 && this.trackedPlayerMap.putIfAbsent(entityplayer, true) == null) { // Paper
this.trackerEntry.b(entityplayer);
+ getPlayerTrackedEntityMap(entityplayer.getId()).put(this.tracker.getId(), this); // Paper
}
} else if (this.trackedPlayers.remove(entityplayer)) {
this.trackerEntry.a(entityplayer);
+ getPlayerTrackedEntityMapRemoveQueue(entityplayer.getId()).add(this.tracker.getId()); // Paper
}
}
--
2.25.1.windows.1