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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.
31 lines
1.6 KiB
Diff
31 lines
1.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Wed, 27 Mar 2019 22:48:45 -0400
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Subject: [PATCH] Server Tick Events
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Fires event at start and end of a server tick
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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 8ecfd7a3daa99dabe796d28d27790fb8b45c628b..ddc3da84c5a55d2cd977fcdb18121351606a6b3c 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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@@ -1433,6 +1433,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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});
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isOversleep = false;MinecraftTimings.serverOversleep.stopTiming();
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// Paper end
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+ new com.destroystokyo.paper.event.server.ServerTickStartEvent(this.tickCount+1).callEvent(); // Paper - Server Tick Events
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++this.tickCount;
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this.tickRateManager.tick();
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@@ -1458,6 +1459,11 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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this.runAllTasks();
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}
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// Paper end
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+ // Paper start - Server Tick Events
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+ long endTime = System.nanoTime();
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+ long remaining = (TICK_TIME - (endTime - lastTick)) - catchupTime;
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+ new com.destroystokyo.paper.event.server.ServerTickEndEvent(this.tickCount, ((double)(endTime - lastTick) / 1000000D), remaining).callEvent();
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+ // Paper end - Server Tick Events
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this.profiler.push("tallying");
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long j = Util.getNanos() - i;
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int k = this.tickCount % 100;
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