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Paper/Spigot-Server-Patches/0461-Speed-up-processing-of-chunk-loads-and-generation.patch
Aikar bc17ce69d4
Delay unsafe actions until after entity ticking is done - Fixes #3114 
This will help prevent many cases of unregistering entities during entity ticking

Currently delays Chunk Unloads and Async Chunk load callbacks

Also dropped mid ticking chunk tasks during entity ticking to reduce this risk
2020-04-11 23:22:40 -04:00

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From aa7f8a74b12bd4d919113eac6132707eddf0ef1a Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 9 Apr 2020 00:09:26 -0400
Subject: [PATCH] Speed up processing of chunk loads and generation
Credit to Spotted for the idea
A lot of the new chunk system requires constant back and forth the main thread
to handle priority scheduling and ensuring conflicting tasks do not run at the
same time.
The issue is, these queues are only checked at either:
A) Sync Chunk Loads
B) End of Tick while sleeping
This results in generating chunks sitting waiting for a full tick to
complete before it will even start the next unit of work to do.
Additionally, this also delays loading of chunks until this same timing.
We will now periodically poll the chunk task queues throughout the tick,
looking for work to do.
We do this in a fair method that considers all worlds, not just the one being
ticked, so that each world can get 1 task procesed each before the next pass.
We also cap the throughput of these task processes to 1 per world per 0.1ms or
200 max per tick, to ensure that high volume of tasks do not overload the current
tick time.
In a view distance of 15, chunk loading performance was visually faster on the client.
Flying at high speed in spectator mode was able to keep up with chunk loading (as long as they are already generated)
diff --git a/src/main/java/co/aikar/timings/MinecraftTimings.java b/src/main/java/co/aikar/timings/MinecraftTimings.java
index 69e26a8267..434833d50e 100644
--- a/src/main/java/co/aikar/timings/MinecraftTimings.java
+++ b/src/main/java/co/aikar/timings/MinecraftTimings.java
@@ -13,6 +13,7 @@ import java.util.Map;
public final class MinecraftTimings {
public static final Timing serverOversleep = Timings.ofSafe("Server Oversleep");
+ public static final Timing midTickChunkTasks = Timings.ofSafe("Mid Tick Chunk Tasks");
public static final Timing playerListTimer = Timings.ofSafe("Player List");
public static final Timing commandFunctionsTimer = Timings.ofSafe("Command Functions");
public static final Timing connectionTimer = Timings.ofSafe("Connection Handler");
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index e627440c41..bacfc4cba6 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -602,6 +602,7 @@ public class ChunkProviderServer extends IChunkProvider {
this.world.getMethodProfiler().enter("purge");
this.world.timings.doChunkMap.startTiming(); // Spigot
this.chunkMapDistance.purgeTickets();
+ this.world.getMinecraftServer().midTickLoadChunks(); // Paper
this.tickDistanceManager();
this.world.timings.doChunkMap.stopTiming(); // Spigot
this.world.getMethodProfiler().exitEnter("chunks");
@@ -611,6 +612,7 @@ public class ChunkProviderServer extends IChunkProvider {
this.world.timings.doChunkUnload.startTiming(); // Spigot
this.world.getMethodProfiler().exitEnter("unload");
this.playerChunkMap.unloadChunks(booleansupplier);
+ this.world.getMinecraftServer().midTickLoadChunks(); // Paper
this.world.timings.doChunkUnload.stopTiming(); // Spigot
this.world.getMethodProfiler().exit();
this.clearCache();
@@ -669,7 +671,7 @@ public class ChunkProviderServer extends IChunkProvider {
entityPlayer.playerNaturallySpawnedEvent.callEvent();
};
// Paper end
- this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping
+ final int[] chunksTicked = {0}; this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping
Optional<Chunk> optional = ((Either) playerchunk.b().getNow(PlayerChunk.UNLOADED_CHUNK)).left();
if (optional.isPresent()) {
@@ -752,6 +754,7 @@ public class ChunkProviderServer extends IChunkProvider {
this.world.timings.chunkTicks.startTiming(); // Spigot // Paper
this.world.a(chunk, k);
this.world.timings.chunkTicks.stopTiming(); // Spigot // Paper
+ if (chunksTicked[0]++ % 10 == 0) this.world.getMinecraftServer().midTickLoadChunks(); // Paper
}
}
});
@@ -893,6 +896,38 @@ public class ChunkProviderServer extends IChunkProvider {
super.executeTask(runnable);
}
+ // Paper start
+ private long lastChunkTask = 0;
+ public void midTickLoadChunks() {
+ MinecraftServer server = ChunkProviderServer.this.world.getMinecraftServer();
+ try (co.aikar.timings.Timing ignored = co.aikar.timings.MinecraftTimings.midTickChunkTasks.startTiming()) {
+ while (server.canSleepForTick()) {
+ try {
+ // always try to load chunks as long as we aren't falling behind, restrain generation/other updates only.
+ boolean execChunkTask = com.destroystokyo.paper.io.chunk.ChunkTaskManager.pollChunkWaitQueue() || ChunkProviderServer.this.world.asyncChunkTaskManager.pollNextChunkTask(); // Paper
+ if (ChunkProviderServer.this.tickDistanceManager() || execChunkTask) {
+ continue;
+ }
+ long now = System.nanoTime();
+ // cap to 1 task every 0.1ms per world and max 200 tasks per tick.
+ // Anything that doesn't make it past this can load during sleep
+ // we do not want to use this.executeNext as that also processes chunk loads and might count against task counter.
+ // We also have already ticked the distance manager above too.
+ if (server.chunksTasksRan < 200 && now - lastChunkTask > 100000 && super.executeNext()) {
+ ChunkProviderServer.this.lightEngine.queueUpdate();
+ server.chunksTasksRan++;
+ lastChunkTask = now;
+ }
+ break;
+ } finally {
+ // from below: process pending Chunk loadCallback() and unloadCallback() after each run task
+ playerChunkMap.callbackExecutor.run();
+ }
+ }
+ }
+ }
+ // Paper end
+
@Override
protected boolean executeNext() {
// CraftBukkit start - process pending Chunk loadCallback() and unloadCallback() after each run task
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 06c395000f..936434110c 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -919,6 +919,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
// Paper end
tickSection = curTime;
}
+ chunksTasksRan = 0; // Paper
// Spigot end
//MinecraftServer.currentTick = (int) (System.currentTimeMillis() / 50); // CraftBukkit // Paper - don't overwrite current tick time
@@ -989,7 +990,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
}
- private boolean canSleepForTick() {
+ public boolean canSleepForTick() { // Paper
// CraftBukkit start
return this.forceTicks || this.isEntered() || SystemUtils.getMonotonicMillis() < (this.ac ? this.ab : this.nextTick);
}
@@ -1017,6 +1018,20 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
});
}
+ // Paper start
+ public int chunksTasksRan = 0;
+ public void midTickLoadChunks() {
+ if (!this.canSleepForTick()) {
+ return;
+ }
+
+ Iterator<WorldServer> iterator = this.getWorlds().iterator();
+ while (this.canSleepForTick() && iterator.hasNext()) {
+ iterator.next().getChunkProvider().serverThreadQueue.midTickLoadChunks();
+ }
+ }
+ // Paper end
+
@Override
protected TickTask postToMainThread(Runnable runnable) {
return new TickTask(this.ticks, runnable);
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index e61ddeb1ff..92c9ab43d7 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -793,7 +793,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
CompletableFuture<Either<IChunkAccess, PlayerChunk.Failure>> ret = new CompletableFuture<>();
Consumer<ChunkRegionLoader.InProgressChunkHolder> chunkHolderConsumer = (ChunkRegionLoader.InProgressChunkHolder holder) -> {
- PlayerChunkMap.this.executor.addTask(() -> {
+ com.destroystokyo.paper.io.chunk.ChunkTaskManager.queueChunkWaitTask(() -> {
ret.complete(syncLoadComplete.apply(holder, null));
});
};
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index c7ec8cbc11..cd8266f675 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -420,6 +420,7 @@ public class WorldServer extends World {
}
timings.scheduledBlocks.stopTiming(); // Spigot
+ this.getMinecraftServer().midTickLoadChunks(); // Paper
gameprofilerfiller.exitEnter("raid");
this.timings.raids.startTiming(); // Paper - timings
this.persistentRaid.a();
@@ -432,6 +433,7 @@ public class WorldServer extends World {
timings.doSounds.startTiming(); // Spigot
this.ad();
timings.doSounds.stopTiming(); // Spigot
+ this.getMinecraftServer().midTickLoadChunks(); // Paper
this.ticking = false;
gameprofilerfiller.exitEnter("entities");
boolean flag3 = true || !this.players.isEmpty() || !this.getForceLoadedChunks().isEmpty(); // CraftBukkit - this prevents entity cleanup, other issues on servers with no players
@@ -517,6 +519,7 @@ public class WorldServer extends World {
timings.entityTick.stopTiming(); // Spigot
this.tickingEntities = false;
+ this.getMinecraftServer().midTickLoadChunks(); // Paper
try (co.aikar.timings.Timing ignored = this.timings.newEntities.startTiming()) { // Paper - timings
while ((entity = (Entity) this.entitiesToAdd.poll()) != null) {
@@ -527,7 +530,9 @@ public class WorldServer extends World {
gameprofilerfiller.exit();
timings.tickEntities.stopTiming(); // Spigot
+ this.getMinecraftServer().midTickLoadChunks(); // Paper
this.tickBlockEntities();
+ this.getMinecraftServer().midTickLoadChunks(); // Paper
}
gameprofilerfiller.exit();
--
2.25.1
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