168 lines
9.3 KiB
Diff
168 lines
9.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <spottedleaf@spottedleaf.dev>
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Date: Mon, 6 Apr 2020 04:20:44 -0700
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Subject: [PATCH] Execute chunk tasks mid-tick
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This will help the server load chunks if tick times are high.
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diff --git a/src/main/java/co/aikar/timings/MinecraftTimings.java b/src/main/java/co/aikar/timings/MinecraftTimings.java
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index b27021a42cbed3f0648a8d0903d00d03922ae221..eada966d7f108a6081be7a848f5c1dfcb1eed676 100644
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--- a/src/main/java/co/aikar/timings/MinecraftTimings.java
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+++ b/src/main/java/co/aikar/timings/MinecraftTimings.java
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@@ -45,6 +45,8 @@ public final class MinecraftTimings {
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public static final Timing antiXrayUpdateTimer = Timings.ofSafe("anti-xray - update");
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public static final Timing antiXrayObfuscateTimer = Timings.ofSafe("anti-xray - obfuscate");
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+ public static final Timing midTickChunkTasks = Timings.ofSafe("Mid Tick Chunk Tasks");
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+
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private static final Map<Class<?>, String> taskNameCache = new MapMaker().weakKeys().makeMap();
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private MinecraftTimings() {}
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diff --git a/src/main/java/com/destroystokyo/paper/server/ticklist/PaperTickList.java b/src/main/java/com/destroystokyo/paper/server/ticklist/PaperTickList.java
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index 5fdaefc128956581be4bb9b34199fd6410563991..b7edc1121797bc1c57e25f540ed0124fa8b36b7a 100644
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--- a/src/main/java/com/destroystokyo/paper/server/ticklist/PaperTickList.java
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+++ b/src/main/java/com/destroystokyo/paper/server/ticklist/PaperTickList.java
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@@ -312,6 +312,7 @@ public final class PaperTickList<T> extends ServerTickList<T> { // extend to avo
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toTick.tickState = STATE_SCHEDULED;
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this.addToNotTickingReady(toTick);
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}
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+ MinecraftServer.getServer().executeMidTickTasks(); // Paper - exec chunk tasks during world tick
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} catch (final Throwable thr) {
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// start copy from TickListServer // TODO check on update
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CrashReport crashreport = CrashReport.forThrowable(thr, "Exception while ticking");
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index ecb167f6a114a7e3bfac05db2e87631ec88a0ba2..fe6d5051b139cd6079e288ffdf20e30fdd46fdda 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -330,6 +330,76 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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return s0;
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}
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+ // Paper start - execute chunk tasks mid tick
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+ static final long CHUNK_TASK_QUEUE_BACKOFF_MIN_TIME = 25L * 1000L; // 25us
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+ static final long MAX_CHUNK_EXEC_TIME = 1000L; // 1us
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+
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+ static final long TASK_EXECUTION_FAILURE_BACKOFF = 5L * 1000L; // 5us
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+
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+ private static long lastMidTickExecute;
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+ private static long lastMidTickExecuteFailure;
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+
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+ private boolean tickMidTickTasks() {
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+ // give all worlds a fair chance at by targetting them all.
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+ // if we execute too many tasks, that's fine - we have logic to correctly handle overuse of allocated time.
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+ boolean executed = false;
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+ for (ServerLevel world : this.getAllLevels()) {
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+ long currTime = System.nanoTime();
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+ if (currTime - world.lastMidTickExecuteFailure <= TASK_EXECUTION_FAILURE_BACKOFF) {
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+ continue;
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+ }
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+ if (!world.getChunkSource().pollTask()) {
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+ // we need to back off if this fails
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+ world.lastMidTickExecuteFailure = currTime;
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+ } else {
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+ executed = true;
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+ }
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+ }
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+
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+ return executed;
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+ }
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+
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+ public final void executeMidTickTasks() {
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+ org.spigotmc.AsyncCatcher.catchOp("mid tick chunk task execution");
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+ long startTime = System.nanoTime();
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+ if ((startTime - lastMidTickExecute) <= CHUNK_TASK_QUEUE_BACKOFF_MIN_TIME || (startTime - lastMidTickExecuteFailure) <= TASK_EXECUTION_FAILURE_BACKOFF) {
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+ // it's shown to be bad to constantly hit the queue (chunk loads slow to a crawl), even if no tasks are executed.
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+ // so, backoff to prevent this
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+ return;
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+ }
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+
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+ co.aikar.timings.MinecraftTimings.midTickChunkTasks.startTiming();
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+ try {
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+ for (;;) {
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+ boolean moreTasks = this.tickMidTickTasks();
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+ long currTime = System.nanoTime();
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+ long diff = currTime - startTime;
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+
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+ if (!moreTasks || diff >= MAX_CHUNK_EXEC_TIME) {
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+ if (!moreTasks) {
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+ lastMidTickExecuteFailure = currTime;
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+ }
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+
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+ // note: negative values reduce the time
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+ long overuse = diff - MAX_CHUNK_EXEC_TIME;
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+ if (overuse >= (10L * 1000L * 1000L)) { // 10ms
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+ // make sure something like a GC or dumb plugin doesn't screw us over...
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+ overuse = 10L * 1000L * 1000L; // 10ms
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+ }
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+
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+ double overuseCount = (double)overuse/(double)MAX_CHUNK_EXEC_TIME;
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+ long extraSleep = (long)Math.round(overuseCount*CHUNK_TASK_QUEUE_BACKOFF_MIN_TIME);
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+
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+ lastMidTickExecute = currTime + extraSleep;
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+ return;
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+ }
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+ }
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+ } finally {
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+ co.aikar.timings.MinecraftTimings.midTickChunkTasks.stopTiming();
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+ }
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+ }
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+ // Paper end - execute chunk tasks mid tick
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+
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public MinecraftServer(OptionSet options, DataPackConfig datapackconfiguration, Thread thread, RegistryAccess.RegistryHolder iregistrycustom_dimension, LevelStorageSource.LevelStorageAccess convertable_conversionsession, WorldData savedata, PackRepository resourcepackrepository, Proxy proxy, DataFixer datafixer, ServerResources datapackresources, @Nullable MinecraftSessionService minecraftsessionservice, @Nullable GameProfileRepository gameprofilerepository, @Nullable GameProfileCache usercache, ChunkProgressListenerFactory worldloadlistenerfactory) {
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super("Server");
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SERVER = this; // Paper - better singleton
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@@ -1324,6 +1394,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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private boolean pollTaskInternal() {
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if (super.pollTask()) {
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+ this.executeMidTickTasks(); // Paper - execute chunk tasks mid tick
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return true;
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} else {
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if (this.haveTime()) {
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diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
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index 7ea86cbeb72f08d751c14006f428fe5921916061..108f2212f8bd00247bf73ff4f3ba42830abad459 100644
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--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
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+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
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@@ -1022,6 +1022,7 @@ public class ServerChunkCache extends ChunkSource {
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Collections.shuffle(shuffled);
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iterator = shuffled.iterator();
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}
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+ int chunksTicked = 0; // Paper
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try { while (iterator.hasNext()) {
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LevelChunk chunk = iterator.next();
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ChunkHolder playerchunk = chunk.playerChunk;
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@@ -1044,6 +1045,7 @@ public class ServerChunkCache extends ChunkSource {
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this.level.tickChunk(chunk, k);
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// this.level.timings.doTickTiles.stopTiming(); // Spigot // Paper
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}
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+ if ((chunksTicked++ & 1) == 0) net.minecraft.server.MinecraftServer.getServer().executeMidTickTasks(); // Paper
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}
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} // Paper start - optimise chunk tick iteration
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} finally {
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diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
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index 3351c4d43b41db5a0718d7ff761b06d950b7ee87..9c69855874da2c18e9c80decf4244a0f50021a28 100644
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--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
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+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
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@@ -190,7 +190,9 @@ public class ServerLevel extends Level implements WorldGenLevel {
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final Int2ObjectMap<EnderDragonPart> dragonParts;
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private final StructureFeatureManager structureFeatureManager;
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private final boolean tickTime;
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-
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+ // Paper start - execute chunk tasks mid tick
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+ public long lastMidTickExecuteFailure;
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+ // Paper end - execute chunk tasks mid tick
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// CraftBukkit start
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private int tickPosition;
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diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
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index bdd50c28a76576be7950e3ccf8e00b622f3860d1..6818de8db716a3d4bcf8a6ee4dc6acccf441cddb 100644
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--- a/src/main/java/net/minecraft/world/level/Level.java
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+++ b/src/main/java/net/minecraft/world/level/Level.java
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@@ -914,6 +914,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
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public <T extends Entity> void guardEntityTick(Consumer<T> tickConsumer, T entity) {
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try {
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tickConsumer.accept(entity);
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+ MinecraftServer.getServer().executeMidTickTasks(); // Paper - execute chunk tasks mid tick
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} catch (Throwable throwable) {
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if (throwable instanceof ThreadDeath) throw throwable; // Paper
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// Paper start - Prevent tile entity and entity crashes
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