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papermc/Spigot-Server-Patches/0127-Delay-Chunk-Unloads-based-on-Player-Movement.patch

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From 8b0ebf88191276c87b61235e51405887463861a3 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.
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 321da3be3..0e6c18b32 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -284,4 +284,18 @@ 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 718ebfea0..6c6924937 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -39,6 +39,7 @@ public class Chunk implements IChunkAccess {
private boolean j; public boolean isLoaded() { return j; } // 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 m;
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 7825dc91b..2e72a294d 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -318,6 +318,19 @@ 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.f.a();
this.chunkLoader.b();
diff --git a/src/main/java/net/minecraft/server/PlayerChunk.java b/src/main/java/net/minecraft/server/PlayerChunk.java
index ffff87dc0..344b95233 100644
--- a/src/main/java/net/minecraft/server/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/PlayerChunk.java
@@ -33,14 +33,23 @@ public class PlayerChunk {
public void run() {
loadInProgress = false;
PlayerChunk.this.chunk = PlayerChunk.this.playerChunkMap.getWorld().getChunkProviderServer().getOrLoadChunkAt(location.x, location.z);
+ markChunkUsed(); // Paper - delay chunk unloads
}
};
+ // Paper start - delay chunk unloads
+ public final void markChunkUsed() {
+ if (chunk != null && chunk.scheduledForUnload != null) {
+ chunk.scheduledForUnload = null;
+ }
+ }
+ // Paper end
// CraftBukkit end
public PlayerChunk(PlayerChunkMap playerchunkmap, int i, int j) {
this.playerChunkMap = playerchunkmap;
this.location = new ChunkCoordIntPair(i, j);
this.chunk = playerchunkmap.getWorld().getChunkProviderServer().getOrLoadChunkAt(i, j);
+ markChunkUsed(); // Paper - delay chunk unloads
}
public ChunkCoordIntPair a() {
@@ -85,6 +94,7 @@ public class PlayerChunk {
this.chunk = this.playerChunkMap.getWorld().getChunkProviderServer().getChunkAt(this.location.x, this.location.z);
} else {
this.chunk = this.playerChunkMap.getWorld().getChunkProviderServer().getOrLoadChunkAt(this.location.x, this.location.z);
+ 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 4d888d6d4..cf5c76a78 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -461,7 +461,13 @@ 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 5102f24ed..c9b6b57af 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1294,7 +1294,13 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
if (!tileentity.x() && tileentity.u()) {
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.isUnloading() && 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 ff3558363..90e260f3b 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1581,7 +1581,7 @@ 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 a9b84fdec..e02647f80 100644
--- a/src/main/java/org/spigotmc/ActivationRange.java
+++ b/src/main/java/org/spigotmc/ActivationRange.java
@@ -284,6 +284,10 @@ public class ActivationRange
{
isActive = false;
}
+ // Paper start - Skip ticking in chunks scheduled for unload
+ if(entity.world.paperConfig.skipEntityTickingInChunksScheduledForUnload && (chunk == null || chunk.isUnloading() || chunk.scheduledForUnload != null))
+ isActive = false;
+ // Paper end
return isActive;
}
}
--
2.18.0
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