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Remove wall-time / unused skip tick protection (#11412)

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Spigot still maintains some partial implementation of "tick skipping", a
practice in which the MinecraftServer.currentTick field is updated not
by an increment of one per actual tick, but instead set to
System.currentTimeMillis() / 50. This behaviour means that the tracked
tick may "skip" a tick value in case a previous tick took more than the
expected 50ms.

To compensate for this in important paths, spigot/craftbukkit
implements "wall-time". Instead of incrementing/decrementing ticks on
block entities/entities by one for each call to their tick() method,
they instead increment/decrement important values, like
an ItemEntity's age or pickupDelay, by the difference of
`currentTick - lastTick`, where `lastTick` is the value of
`currentTick` during the last tick() call.

These "fixes" however do not play nicely with minecraft's simulation
distance as entities/block entities implementing the above behaviour
would "catch up" their values when moving from a non-ticking chunk to a
ticking one as their `lastTick` value remains stuck on the last tick in
a ticking chunk and hence lead to a large "catch up" once ticked again.

Paper completely removes the "tick skipping" behaviour (See patch
"Further-improve-server-tick-loop"), making the above precautions
completely unnecessary, which also rids paper of the previous described
incompatibility with non-ticking chunks.
This commit is contained in:
Bjarne Koll 2024-09-19 16:36:07 +02:00 • committed by GitHub
parent 5c82955733
commit c5a10665b8
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
794 changed files with 402 additions and 282 deletions
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6
patches/server/0093-remove-null-possibility-for-getServer-singleton.patch
View file

@ -6,7 +6,7 @@ Subject: [PATCH] remove null possibility for getServer singleton
to stop IDE complaining about potential NPE
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 6dec7884fdd15eb8f32e8831ed0f3a92af710472..d8f2fe077e35fd6c70e0ba50945006819f50586f 100644
index 30fbbe053ee325f4b9f7722416fb5fb92121e2ad..f16ade2019e58a9374a550f58113313c118c2f2b 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -197,6 +197,7 @@ import co.aikar.timings.MinecraftTimings; // Paper
@ -17,7 +17,7 @@ index 6dec7884fdd15eb8f32e8831ed0f3a92af710472..d8f2fe077e35fd6c70e0ba5094500681
public static final Logger LOGGER = LogUtils.getLogger();
public static final net.kyori.adventure.text.logger.slf4j.ComponentLogger COMPONENT_LOGGER = net.kyori.adventure.text.logger.slf4j.ComponentLogger.logger(LOGGER.getName()); // Paper
public static final String VANILLA_BRAND = "vanilla";
@@ -331,6 +332,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
@@ -330,6 +331,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
public MinecraftServer(OptionSet options, WorldLoader.DataLoadContext worldLoader, Thread thread, LevelStorageSource.LevelStorageAccess convertable_conversionsession, PackRepository resourcepackrepository, WorldStem worldstem, Proxy proxy, DataFixer datafixer, Services services, ChunkProgressListenerFactory worldloadlistenerfactory) {
super("Server");
@ -25,7 +25,7 @@ index 6dec7884fdd15eb8f32e8831ed0f3a92af710472..d8f2fe077e35fd6c70e0ba5094500681
this.metricsRecorder = InactiveMetricsRecorder.INSTANCE;
this.profiler = this.metricsRecorder.getProfiler();
this.onMetricsRecordingStopped = (methodprofilerresults) -> {
@@ -2548,9 +2550,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
@@ -2546,9 +2548,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
return false;
}