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Delay Chunk Unloads based on Player Movement

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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 commit is contained in:
Aikar 2016-06-18 23:33:57 -04:00
parent 4d7917a87d
commit 0aa71fbf41
1 changed files with 146 additions and 0 deletions
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Spigot-Server-Patches/0166-Delay-Chunk-Unloads-based-on-Player-Movement.patch Normal file
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@ -0,0 +1,146 @@
From 68e4453fda0928d5f744d39a343cd16afc82bed2 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 0d2af96..bc41b7e 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -364,6 +364,15 @@ public class PaperWorldConfig {
}
}
+ public long delayChunkUnloadsBy;
+ private void delayChunkUnloadsBy() {
+ delayChunkUnloadsBy = PaperConfig.getSeconds(getString("delay-chunk-unloads-by", "30s"));
+ if (delayChunkUnloadsBy > 0) {
+ log("Delaying chunk unloads by " + delayChunkUnloadsBy + " seconds");
+ delayChunkUnloadsBy *= 1000;
+ }
+ }
+
public boolean isHopperPushBased;
private void isHopperPushBased() {
isHopperPushBased = getBoolean("hopper.push-based", true);
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 2429579..e4be7d8 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -31,6 +31,7 @@ public class Chunk {
public final World world;
public final int[] heightMap;
public final long chunkKey; // Paper
+ 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 33b3db7..21ca3c5 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -351,6 +351,19 @@ public class ChunkProviderServer implements IChunkProvider {
}
}
}
+ // 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.chunkLoader.a();
}
diff --git a/src/main/java/net/minecraft/server/PlayerChunk.java b/src/main/java/net/minecraft/server/PlayerChunk.java
index dd40e98..f109e98 100644
--- a/src/main/java/net/minecraft/server/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/PlayerChunk.java
@@ -32,8 +32,16 @@ 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) {
@@ -42,6 +50,7 @@ public class PlayerChunk {
// CraftBukkit start
loadInProgress = true;
this.chunk = playerchunkmap.getWorld().getChunkProviderServer().getChunkAt(i, j, loadedRunnable, false);
+ markChunkUsed(); // Paper - delay chunk unloads
// CraftBukkit end
}
@@ -110,6 +119,7 @@ public class PlayerChunk {
if (!loadInProgress) {
loadInProgress = true;
this.chunk = playerChunkMap.getWorld().getChunkProviderServer().getChunkAt(this.location.x, this.location.z, loadedRunnable, flag);
+ markChunkUsed(); // Paper - delay chunk unloads
}
// CraftBukkit end
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index 6320247..9fed846 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -458,7 +458,13 @@ 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/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 22d142a..8aaf64f 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1548,7 +1548,7 @@ 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;
}
--
2.9.0