Remove wall-time / unused skip tick protection (#11412)
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.
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794 changed files with 402 additions and 282 deletions
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@ -92,10 +92,10 @@ index 54562fa04d14a937451ea7aa9d80194f2c31b471..4cf88f6d815d60cfbf8e4ecf9d96d0cf
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return executorService;
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}
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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 5d429b707383e6620a0d83f23d7a8694ecc70735..995ee6b2af01a14d61a031008dd05518668a98ae 100644
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index 2d5ae71c143556a938f078d2fb84cab7bd4f789b..f3f3f80f14bc1df13b80033aa143fcccab6f3a31 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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@@ -323,6 +323,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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@@ -322,6 +322,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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thread.setUncaughtExceptionHandler((thread1, throwable) -> {
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MinecraftServer.LOGGER.error("Uncaught exception in server thread", throwable);
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});
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