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c5a10665b8
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.
19 lines
986 B
Diff
19 lines
986 B
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andrew Steinborn <git@steinborn.me>
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Date: Sun, 8 Aug 2021 00:52:54 -0400
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Subject: [PATCH] Optimize entity tracker passenger checks
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diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
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index 9f04dc7817909d81f387b03bfc57d2d9a1d63478..7e8a43ea1b32f444fb66e270a5f6b48bf7bcd2a0 100644
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--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
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+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
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@@ -71,7 +71,7 @@ public class ServerEntity {
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private Vec3 lastSentMovement;
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private int tickCount;
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private int teleportDelay;
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- private List<Entity> lastPassengers = Collections.emptyList();
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+ private List<Entity> lastPassengers = com.google.common.collect.ImmutableList.of(); // Paper - optimize passenger checks
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private boolean wasRiding;
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private boolean wasOnGround;
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@Nullable
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