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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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39
patches/server/0853-Cache-map-ids-on-item-frames.patch Normal file
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@ -0,0 +1,39 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Warrior <50800980+Warriorrrr@users.noreply.github.com>
Date: Mon, 7 Aug 2023 12:58:28 +0200
Subject: [PATCH] Cache map ids on item frames
diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
index f010be9605d7458add7e5693ff473fabf679c938..a2fbbbd7a66d4e7b1063638f8467e8887a417282 100644
--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
@@ -117,7 +117,7 @@ public class ServerEntity {
ItemStack itemstack = entityitemframe.getItem();
if (this.level.paperConfig().maps.itemFrameCursorUpdateInterval > 0 && this.tickCount % this.level.paperConfig().maps.itemFrameCursorUpdateInterval == 0 && itemstack.getItem() instanceof MapItem) { // CraftBukkit - Moved this.tickCounter % 10 logic here so item frames do not enter the other blocks // Paper - Make item frame map cursor update interval configurable
- MapId mapid = (MapId) itemstack.get(DataComponents.MAP_ID);
+ MapId mapid = entityitemframe.cachedMapId; // Paper - Perf: Cache map ids on item frames
MapItemSavedData worldmap = MapItem.getSavedData(mapid, this.level);
if (worldmap != null) {
diff --git a/src/main/java/net/minecraft/world/entity/decoration/ItemFrame.java b/src/main/java/net/minecraft/world/entity/decoration/ItemFrame.java
index ba4e0ad7c7c2731d61ec7f60f19d7e9ec31a28ba..5b7245cd99593ee90e17c97e0104f3aba9ae05ea 100644
--- a/src/main/java/net/minecraft/world/entity/decoration/ItemFrame.java
+++ b/src/main/java/net/minecraft/world/entity/decoration/ItemFrame.java
@@ -50,6 +50,7 @@ public class ItemFrame extends HangingEntity {
private static final float HEIGHT = 0.75F;
public float dropChance;
public boolean fixed;
+ public @Nullable MapId cachedMapId; // Paper - Perf: Cache map ids on item frames
public ItemFrame(EntityType<? extends ItemFrame> type, Level world) {
super(type, world);
@@ -322,6 +323,7 @@ public class ItemFrame extends HangingEntity {
}
private void onItemChanged(ItemStack stack) {
+ this.cachedMapId = stack.getComponents().get(net.minecraft.core.component.DataComponents.MAP_ID); // Paper - Perf: Cache map ids on item frames
if (!stack.isEmpty() && stack.getFrame() != this) {
stack.setEntityRepresentation(this);
}