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Paper/patches/server/0736-Execute-chunk-tasks-mid-tick.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Mon, 6 Apr 2020 04:20:44 -0700
Subject: [PATCH] Execute chunk tasks mid-tick
This will help the server load chunks if tick times are high.
diff --git a/src/main/java/co/aikar/timings/MinecraftTimings.java b/src/main/java/co/aikar/timings/MinecraftTimings.java
index b27021a42cbed3f0648a8d0903d00d03922ae221..eada966d7f108a6081be7a848f5c1dfcb1eed676 100644
--- a/src/main/java/co/aikar/timings/MinecraftTimings.java
+++ b/src/main/java/co/aikar/timings/MinecraftTimings.java
@@ -45,6 +45,8 @@ public final class MinecraftTimings {
public static final Timing antiXrayUpdateTimer = Timings.ofSafe("anti-xray - update");
public static final Timing antiXrayObfuscateTimer = Timings.ofSafe("anti-xray - obfuscate");
+ public static final Timing midTickChunkTasks = Timings.ofSafe("Mid Tick Chunk Tasks");
+
private static final Map<Class<?>, String> taskNameCache = new MapMaker().weakKeys().makeMap();
private MinecraftTimings() {}
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 939170ade7c24bcf1c358f00931f867599cf9d54..786eafffa9bc51399c7fdf0012dfdaa9c92e71b0 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1302,6 +1302,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
private boolean pollTaskInternal() {
if (super.pollTask()) {
+ this.executeMidTickTasks(); // Paper - execute chunk tasks mid tick
return true;
} else {
if (this.haveTime()) {
@@ -2624,4 +2625,74 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
}
}
// Paper end
+
+ // Paper start - execute chunk tasks mid tick
+ static final long CHUNK_TASK_QUEUE_BACKOFF_MIN_TIME = 25L * 1000L; // 25us
+ static final long MAX_CHUNK_EXEC_TIME = 1000L; // 1us
+
+ static final long TASK_EXECUTION_FAILURE_BACKOFF = 5L * 1000L; // 5us
+
+ private static long lastMidTickExecute;
+ private static long lastMidTickExecuteFailure;
+
+ private boolean tickMidTickTasks() {
+ // give all worlds a fair chance at by targetting them all.
+ // if we execute too many tasks, that's fine - we have logic to correctly handle overuse of allocated time.
+ boolean executed = false;
+ for (ServerLevel world : this.getAllLevels()) {
+ long currTime = System.nanoTime();
+ if (currTime - world.lastMidTickExecuteFailure <= TASK_EXECUTION_FAILURE_BACKOFF) {
+ continue;
+ }
+ if (!world.getChunkSource().pollTask()) {
+ // we need to back off if this fails
+ world.lastMidTickExecuteFailure = currTime;
+ } else {
+ executed = true;
+ }
+ }
+
+ return executed;
+ }
+
+ public final void executeMidTickTasks() {
+ org.spigotmc.AsyncCatcher.catchOp("mid tick chunk task execution");
+ long startTime = System.nanoTime();
+ if ((startTime - lastMidTickExecute) <= CHUNK_TASK_QUEUE_BACKOFF_MIN_TIME || (startTime - lastMidTickExecuteFailure) <= TASK_EXECUTION_FAILURE_BACKOFF) {
+ // it's shown to be bad to constantly hit the queue (chunk loads slow to a crawl), even if no tasks are executed.
+ // so, backoff to prevent this
+ return;
+ }
+
+ co.aikar.timings.MinecraftTimings.midTickChunkTasks.startTiming();
+ try {
+ for (;;) {
+ boolean moreTasks = this.tickMidTickTasks();
+ long currTime = System.nanoTime();
+ long diff = currTime - startTime;
+
+ if (!moreTasks || diff >= MAX_CHUNK_EXEC_TIME) {
+ if (!moreTasks) {
+ lastMidTickExecuteFailure = currTime;
+ }
+
+ // note: negative values reduce the time
+ long overuse = diff - MAX_CHUNK_EXEC_TIME;
+ if (overuse >= (10L * 1000L * 1000L)) { // 10ms
+ // make sure something like a GC or dumb plugin doesn't screw us over...
+ overuse = 10L * 1000L * 1000L; // 10ms
+ }
+
+ double overuseCount = (double)overuse/(double)MAX_CHUNK_EXEC_TIME;
+ long extraSleep = (long)Math.round(overuseCount*CHUNK_TASK_QUEUE_BACKOFF_MIN_TIME);
+
+ lastMidTickExecute = currTime + extraSleep;
+ return;
+ }
+ }
+ } finally {
+ co.aikar.timings.MinecraftTimings.midTickChunkTasks.stopTiming();
+ }
+ }
+ // Paper end - execute chunk tasks mid tick
}
diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
index 108164945f2aa088834585d9d80274ea551608d9..6058a6d30880f789244e4054cadd43941b7778bd 100644
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
@@ -1012,6 +1012,7 @@ public class ServerChunkCache extends ChunkSource {
iterator1 = shuffled.iterator();
}
+ int chunksTicked = 0; // Paper
try {
while (iterator1.hasNext()) {
LevelChunk chunk1 = iterator1.next();
@@ -1029,6 +1030,7 @@ public class ServerChunkCache extends ChunkSource {
if (this.level.shouldTickBlocksAt(chunkcoordintpair.toLong())) {
this.level.tickChunk(chunk1, k);
+ if ((chunksTicked++ & 1) == 0) net.minecraft.server.MinecraftServer.getServer().executeMidTickTasks(); // Paper
}
}
// Paper start - optimise chunk tick iteration
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 18f28b5ea2919fb12fd1e76555026c2161564372..07f5c61fc3da270215133d2d0240e96f701a6216 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -209,6 +209,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
private final StructureManager structureManager;
private final StructureCheck structureCheck;
private final boolean tickTime;
+ public long lastMidTickExecuteFailure; // Paper - execute chunk tasks mid tick
// CraftBukkit start
public final LevelStorageSource.LevelStorageAccess convertable;
@@ -983,6 +984,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
if (fluid1.is(fluid)) {
fluid1.tick(this, pos);
}
+ MinecraftServer.getServer().executeMidTickTasks(); // Paper - exec chunk tasks during world tick
}
@@ -992,6 +994,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
if (iblockdata.is(block)) {
iblockdata.tick(this, pos, this.random);
}
+ MinecraftServer.getServer().executeMidTickTasks(); // Paper - exec chunk tasks during world tick
}
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index e613d3171200dc436a45bd1980a106d936e351cd..f9ffdeb250e472180616d5b7e944b69e17a217dd 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -795,6 +795,11 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
// Spigot end
} else if (this.shouldTickBlocksAt(tickingblockentity.getPos())) {
tickingblockentity.tick();
+ // Paper start - execute chunk tasks during tick
+ if ((this.tileTickPosition & 7) == 0) {
+ MinecraftServer.getServer().executeMidTickTasks();
+ }
+ // Paper end - execute chunk tasks during tick
}
}
this.blockEntityTickers.removeAll(toRemove);
@@ -809,6 +814,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
public <T extends Entity> void guardEntityTick(Consumer<T> tickConsumer, T entity) {
try {
tickConsumer.accept(entity);
+ MinecraftServer.getServer().executeMidTickTasks(); // Paper - execute chunk tasks mid tick
} catch (Throwable throwable) {
if (throwable instanceof ThreadDeath) throw throwable; // Paper
// Paper start - Prevent tile entity and entity crashes
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