TakeV/Paper
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity
Paper/Spigot-Server-Patches/0460-Mid-Tick-Chunk-Tasks-Speed-up-processing-of-chunk-lo.patch
Aikar fcf89e852e
Improve mid tick chunk loading, Fix Oversleep, other improvements 
Process loads outside of any canSleep check. Original intent was to
only apply those restrictions to generations but realized I had some
checks higher up the call chain.

Reworked the back off strategy to just run every 1 millisecond per world,
and to apply the per tick limit to generations only.

This guarantees that your chunk will load with at most around 1ms delay.

Additionally, fire midTick processing in a few more places, notably the
oversleep section so we can keep processing loads here too which has
a large up to 50ms window...

Speaking of oversleep, we had a bug in our implementation changes for
Timings that caused oversleep to not sleep the correct amount.

Because we now moved it into the NEXT tick instead of THIS tick, the
value of nextTick had already been increased to +50ms, resulting in
the risk of sleeping more than it should, but, more importantly, this
caused every task that was trying to NOT run during oversleep to actually
run during oversleep.

This is now fixed.

Another small tweak is to the /tps command, to no longer show the star when
TPS is right at 20.

Due to ineffeciencies in the sleep precision, TPS is commonly 20.02.
This causes the star to show up almost constantly, so now only show it if
we actually hit a real "catchup".

This commit also improves the changes to the CallbackExecutor, in that
it now is also recursion safe.

It was possible that the executor could run tasks out of desired order
if the executor task scheduled more executor tasks.

We solve this by ensuring new additions do not enter the currently iterated queue.

Each depth level will have its own queue.

Fixes #3220
2020-04-26 01:14:52 -04:00

267 lines
13 KiB
Diff
Raw Blame History

From fb41ea17cc836804549b69cb7112416be1b156c0 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 9 Apr 2020 00:09:26 -0400
Subject: [PATCH] Mid Tick Chunk Tasks - 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.
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 223d3b1125..37341d2d2e 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/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index 6916ed30c4..1e186f149c 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -428,4 +428,9 @@ public class PaperConfig {
*/
}
}
+
+ public static int midTickChunkTasks = 1000;
+ private static void midTickChunkTasks() {
+ midTickChunkTasks = getInt("settings.chunk-tasks-per-tick", midTickChunkTasks);
+ }
}
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 3d79e756d9..98ce805a64 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -683,6 +683,7 @@ 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");
@@ -692,6 +693,7 @@ 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();
@@ -750,7 +752,7 @@ 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()) {
@@ -833,6 +835,7 @@ 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
}
}
});
@@ -974,6 +977,41 @@ public class ChunkProviderServer extends IChunkProvider {
super.executeTask(runnable);
}
+ // Paper start
+ private long lastMidTickChunkTask = 0;
+ public boolean pollChunkLoadTasks() {
+ if (com.destroystokyo.paper.io.chunk.ChunkTaskManager.pollChunkWaitQueue() || ChunkProviderServer.this.world.asyncChunkTaskManager.pollNextChunkTask()) {
+ try {
+ ChunkProviderServer.this.tickDistanceManager();
+ } finally {
+ // from below: process pending Chunk loadCallback() and unloadCallback() after each run task
+ playerChunkMap.callbackExecutor.run();
+ }
+ return true;
+ }
+ return false;
+ }
+ public void midTickLoadChunks() {
+ MinecraftServer server = ChunkProviderServer.this.world.getMinecraftServer();
+ // always try to load chunks, restrain generation/other updates only. don't count these towards tick count
+ //noinspection StatementWithEmptyBody
+ while (pollChunkLoadTasks()) {}
+
+ if (System.nanoTime() - lastMidTickChunkTask < 1000000) {
+ return;
+ }
+
+ for (;server.midTickChunksTasksRan < com.destroystokyo.paper.PaperConfig.midTickChunkTasks && server.canSleepForTick();) {
+ if (this.executeNext()) {
+ server.midTickChunksTasksRan++;
+ lastMidTickChunkTask = System.nanoTime();
+ } else {
+ break;
+ }
+ }
+ }
+ // 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 77adc64e30..3c25436f15 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -907,6 +907,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
// Paper end
tickSection = curTime;
}
+ midTickChunksTasksRan = 0; // Paper
// Spigot end
//MinecraftServer.currentTick = (int) (System.currentTimeMillis() / 50); // CraftBukkit // Paper - don't overwrite current tick time
@@ -977,7 +978,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
}
- private boolean canSleepForTick() {
+ public boolean canSleepForTick() { // Paper
// CraftBukkit start
if (isOversleep) return canOversleep();// Paper - because of our changes, this logic is broken
return this.forceTicks || this.isEntered() || SystemUtils.getMonotonicMillis() < (this.ac ? this.ab : this.nextTick);
@@ -1007,6 +1008,23 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
});
}
+ // Paper start
+ public int midTickChunksTasksRan = 0;
+ private long midTickLastRan = 0;
+ public void midTickLoadChunks() {
+ if (!isMainThread() || System.nanoTime() - midTickLastRan < 250000) {
+ // only check once per 0.25ms incase this code is called in a hot method
+ return;
+ }
+ try (co.aikar.timings.Timing ignored = co.aikar.timings.MinecraftTimings.midTickChunkTasks.startTiming()) {
+ for (WorldServer value : this.getWorlds()) {
+ value.getChunkProvider().serverThreadQueue.midTickLoadChunks();
+ }
+ midTickLastRan = System.nanoTime();
+ }
+ }
+ // Paper end
+
@Override
protected TickTask postToMainThread(Runnable runnable) {
return new TickTask(this.ticks, runnable);
@@ -1093,6 +1111,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
// Paper start - move oversleep into full server tick
isOversleep = true;MinecraftTimings.serverOversleep.startTiming();
this.awaitTasks(() -> {
+ midTickLoadChunks(); // will only do loads since we are still considered !canSleepForTick
return !this.canOversleep();
});
isOversleep = false;MinecraftTimings.serverOversleep.stopTiming();
@@ -1175,13 +1194,16 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
}
protected void b(BooleanSupplier booleansupplier) {
+ midTickLoadChunks(); // Paper
MinecraftTimings.bukkitSchedulerTimer.startTiming(); // Spigot // Paper
this.server.getScheduler().mainThreadHeartbeat(this.ticks); // CraftBukkit
MinecraftTimings.bukkitSchedulerTimer.stopTiming(); // Spigot // Paper
+ midTickLoadChunks(); // Paper
this.methodProfiler.enter("commandFunctions");
MinecraftTimings.commandFunctionsTimer.startTiming(); // Spigot // Paper
this.getFunctionData().tick();
MinecraftTimings.commandFunctionsTimer.stopTiming(); // Spigot // Paper
+ midTickLoadChunks(); // Paper
this.methodProfiler.exitEnter("levels");
Iterator iterator = this.getWorlds().iterator();
@@ -1192,7 +1214,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
processQueue.remove().run();
}
MinecraftTimings.processQueueTimer.stopTiming(); // Spigot
-
+ midTickLoadChunks(); // Paper
MinecraftTimings.timeUpdateTimer.startTiming(); // Spigot // Paper
// Send time updates to everyone, it will get the right time from the world the player is in.
// Paper start - optimize time updates
@@ -1235,9 +1257,11 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
this.methodProfiler.enter("tick");
try {
+ midTickLoadChunks(); // Paper
worldserver.timings.doTick.startTiming(); // Spigot
worldserver.doTick(booleansupplier);
worldserver.timings.doTick.stopTiming(); // Spigot
+ midTickLoadChunks(); // Paper
} catch (Throwable throwable) {
// Spigot Start
CrashReport crashreport;
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index 142770bcd6..3f62fe2bb1 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) {
@@ -527,6 +530,7 @@ public class WorldServer extends World {
gameprofilerfiller.exit();
timings.tickEntities.stopTiming(); // Spigot
+ this.getMinecraftServer().midTickLoadChunks(); // Paper
this.tickBlockEntities();
}
--
2.26.2
Reference in a new issue View git blame Copy permalink