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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.
38 lines
1.7 KiB
Diff
38 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Tue, 28 Dec 2021 07:19:01 -0800
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Subject: [PATCH] Execute chunk tasks fairly for worlds while waiting for next
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tick
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Currently, only the first world would have had tasks executed.
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This might result in chunks loading far slower in the nether,
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for example.
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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 718b653a118a1c64d07efab93192f10dfcbf414e..d45f234fe389ade739bb13f824a1f650709220b8 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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@@ -1369,6 +1369,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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if (super.pollTask()) {
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return true;
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} else {
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+ boolean ret = false; // Paper - force execution of all worlds, do not just bias the first
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if (this.tickRateManager.isSprinting() || this.haveTime()) {
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Iterator iterator = this.getAllLevels().iterator();
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@@ -1376,12 +1377,12 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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ServerLevel worldserver = (ServerLevel) iterator.next();
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if (worldserver.getChunkSource().pollTask()) {
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- return true;
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+ ret = true; // Paper - force execution of all worlds, do not just bias the first
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}
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}
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}
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- return false;
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+ return ret; // Paper - force execution of all worlds, do not just bias the first
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}
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}
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