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papermc/Spigot-Server-Patches/0123-Delay-Chunk-Unloads-based-on-Player-Movement.patch
Aikar bbfef2d293
[Auto] Updated Upstream (CraftBukkit) 
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

CraftBukkit Changes:
aed3aecb Make natural item dropping mimic Vanilla
2018-10-31 05:21:34 -04:00

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From b0efda0569a3f5e6285e5fb2abd2bb310d5a1565 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 18 Jun 2016 23:22:12 -0400
Subject: [PATCH] Delay Chunk Unloads based on Player Movement
When players are moving in the world, doing things such as building or exploring,
they will commonly go back and forth in a small area. This causes a ton of chunk load
and unload activity on the edge chunks of their view distance.
A simple back and forth movement in 6 blocks could spam a chunk to thrash a
loading and unload cycle over and over again.
This is very wasteful. This system introduces a delay of inactivity on a chunk
before it actually unloads, which is maintained separately from ChunkGC.
This allows servers with smaller worlds who do less long distance exploring to stop
wasting cpu cycles on saving/unloading/reloading chunks repeatedly.
This also makes the Chunk GC System useless, by auto scheduling unload as soon as
a spare chunk is added to the server thats outside of view distance.
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index ff1a2046f..0cd15c17e 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -296,4 +296,18 @@ public class PaperWorldConfig {
preventTntFromMovingInWater = getBoolean("prevent-tnt-from-moving-in-water", false);
log("Prevent TNT from moving in water: " + preventTntFromMovingInWater);
}
+
+ public long delayChunkUnloadsBy;
+ private void delayChunkUnloadsBy() {
+ delayChunkUnloadsBy = PaperConfig.getSeconds(getString("delay-chunk-unloads-by", "10s"));
+ if (delayChunkUnloadsBy > 0) {
+ log("Delaying chunk unloads by " + delayChunkUnloadsBy + " seconds");
+ delayChunkUnloadsBy *= 1000;
+ }
+ }
+
+ public boolean skipEntityTickingInChunksScheduledForUnload = true;
+ private void skipEntityTickingInChunksScheduledForUnload() {
+ skipEntityTickingInChunksScheduledForUnload = getBoolean("skip-entity-ticking-in-chunks-scheduled-for-unload", skipEntityTickingInChunksScheduledForUnload);
+ }
}
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 28ec8628d..234c9eb1c 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -36,6 +36,7 @@ public class Chunk implements IChunkAccess {
private boolean i;public boolean isLoaded() { return i; } // Paper - OBFHELPER
public final World world;
public final Map<HeightMap.Type, HeightMap> heightMap;
+ public Long scheduledForUnload; // Paper - delay chunk unloads
public final int locX;
public final int locZ;
private boolean l;
diff --git a/src/main/java/net/minecraft/server/ChunkMap.java b/src/main/java/net/minecraft/server/ChunkMap.java
index 71ddaf591..39ac032b0 100644
--- a/src/main/java/net/minecraft/server/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/ChunkMap.java
@@ -48,6 +48,15 @@ public class ChunkMap extends Long2ObjectOpenHashMap<Chunk> {
}
}
}
+ // Paper start - if this is a spare chunk (not part of any players view distance), go ahead and queue it for unload.
+ if (!((WorldServer)chunk.world).getPlayerChunkMap().isChunkInUse(chunk.locX, chunk.locZ)) {
+ if (chunk.world.paperConfig.delayChunkUnloadsBy > 0) {
+ chunk.scheduledForUnload = System.currentTimeMillis();
+ } else {
+ ((WorldServer) chunk.world).getChunkProviderServer().unload(chunk);
+ }
+ }
+ // Paper end
chunk.world.timings.syncChunkLoadPostTimer.stopTiming(); // Paper
// CraftBukkit end
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 42d0731f0..e32c9f9a6 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -306,6 +306,19 @@ public class ChunkProviderServer implements IChunkProvider {
}
activityAccountant.endActivity(); // Spigot
}
+ // Paper start - delayed chunk unloads
+ long now = System.currentTimeMillis();
+ long unloadAfter = world.paperConfig.delayChunkUnloadsBy;
+ if (unloadAfter > 0) {
+ //noinspection Convert2streamapi
+ for (Chunk chunk : chunks.values()) {
+ if (chunk.scheduledForUnload != null && now - chunk.scheduledForUnload > unloadAfter) {
+ chunk.scheduledForUnload = null;
+ unload(chunk);
+ }
+ }
+ }
+ // Paper end
this.chunkScheduler.a(booleansupplier);
}
diff --git a/src/main/java/net/minecraft/server/PlayerChunk.java b/src/main/java/net/minecraft/server/PlayerChunk.java
index ac0e90eec..2fd8fa30e 100644
--- a/src/main/java/net/minecraft/server/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/PlayerChunk.java
@@ -33,8 +33,22 @@ public class PlayerChunk {
public void run() {
loadInProgress = false;
PlayerChunk.this.chunk = PlayerChunk.this.playerChunkMap.getWorld().getChunkProviderServer().getChunkAt(location.x, location.z, true, true);
+ markChunkUsed(); // Paper - delay chunk unloads
}
};
+ // Paper start - delay chunk unloads
+ private void markChunkUsed() {
+ if (chunk == null) {
+ return;
+ }
+ if (chunkHasPlayers) {
+ chunk.scheduledForUnload = null;
+ } else if (chunk.scheduledForUnload == null) {
+ chunk.scheduledForUnload = System.currentTimeMillis();
+ }
+ }
+ private boolean chunkHasPlayers = false;
+ // Paper end
// CraftBukkit end
public PlayerChunk(PlayerChunkMap playerchunkmap, int i, int j) {
@@ -44,6 +58,7 @@ public class PlayerChunk {
chunkproviderserver.a(i, j);
this.chunk = chunkproviderserver.getChunkAt(i, j, true, false);
+ markChunkUsed(); // Paper - delay chunk unloads
}
public ChunkCoordIntPair a() {
@@ -56,6 +71,8 @@ public class PlayerChunk {
} else {
if (this.c.isEmpty()) {
this.i = this.playerChunkMap.getWorld().getTime();
+ chunkHasPlayers = true; // Paper - delay chunk unloads
+ markChunkUsed(); // Paper - delay chunk unloads
}
this.c.add(entityplayer);
@@ -74,6 +91,8 @@ public class PlayerChunk {
this.c.remove(entityplayer);
if (this.c.isEmpty()) {
+ chunkHasPlayers = false; // Paper - delay chunk unloads
+ markChunkUsed(); // Paper - delay chunk unloads
this.playerChunkMap.b(this);
}
@@ -85,6 +104,7 @@ public class PlayerChunk {
return true;
} else {
this.chunk = this.playerChunkMap.getWorld().getChunkProviderServer().getChunkAt(this.location.x, this.location.z, true, flag);
+ markChunkUsed(); // Paper - delay chunk unloads
return this.chunk != null;
}
}
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index 1318ddd99..bc67565bf 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -460,7 +460,13 @@ public class PlayerChunkMap {
Chunk chunk = playerchunk.f();
if (chunk != null) {
- this.getWorld().getChunkProviderServer().unload(chunk);
+ // Paper start - delay chunk unloads
+ if (world.paperConfig.delayChunkUnloadsBy <= 0) {
+ this.getWorld().getChunkProviderServer().unload(chunk);
+ } else {
+ chunk.scheduledForUnload = System.currentTimeMillis();
+ }
+ // Paper end
}
}
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 8aa4138a2..225f7574d 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1342,7 +1342,13 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
if (!tileentity.x() && tileentity.hasWorld()) {
BlockPosition blockposition = tileentity.getPosition();
- if (this.isLoaded(blockposition) && this.K.a(blockposition)) {
+ // Paper start - Skip ticking in chunks scheduled for unload
+ net.minecraft.server.Chunk chunk = this.getChunkIfLoaded(blockposition);
+ boolean shouldTick = chunk != null;
+ if(this.paperConfig.skipEntityTickingInChunksScheduledForUnload)
+ shouldTick = shouldTick && chunk.scheduledForUnload == null;
+ if (shouldTick && this.K.a(blockposition)) {
+ // Paper end
try {
this.methodProfiler.a(() -> {
return String.valueOf(TileEntityTypes.a(tileentity.C()));
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 5d8e85a0a..178f462c4 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1756,7 +1756,7 @@ public class CraftWorld implements World {
ChunkProviderServer cps = world.getChunkProviderServer();
for (net.minecraft.server.Chunk chunk : cps.chunks.values()) {
// If in use, skip it
- if (isChunkInUse(chunk.locX, chunk.locZ)) {
+ if (isChunkInUse(chunk.locX, chunk.locZ) || chunk.scheduledForUnload != null) { // Paper - delayed chunk unloads
continue;
}
diff --git a/src/main/java/org/spigotmc/ActivationRange.java b/src/main/java/org/spigotmc/ActivationRange.java
index dfa59bbdd..8f0a999b0 100644
--- a/src/main/java/org/spigotmc/ActivationRange.java
+++ b/src/main/java/org/spigotmc/ActivationRange.java
@@ -319,6 +319,11 @@ public class ActivationRange
{
isActive = false;
}
+ // Paper start - Skip ticking in chunks scheduled for unload
+ else if (entity.world.paperConfig.skipEntityTickingInChunksScheduledForUnload && (chunk == null || chunk.scheduledForUnload != null)) {
+ isActive = false;
+ }
+ // Paper end
return isActive;
}
}
--
2.19.1
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