From 51db9f7a8b2e9545edec3a323c0d6c1e298d30d8 Mon Sep 17 00:00:00 2001 From: Aikar 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 8da7e39ee..99421aca9 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; + 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 bac5c921b..4f9ece9e4 100644 --- a/src/main/java/net/minecraft/server/ChunkProviderServer.java +++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java @@ -317,6 +317,19 @@ 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 f1c036aa6..95ec4f48f 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