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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.
48 Zeilen
2.1 KiB
Diff
48 Zeilen
2.1 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: Thu, 3 Mar 2016 02:02:07 -0600
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Subject: [PATCH] Optimize Pathfinding
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Prevents pathfinding from spamming failures for things such as
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arrow attacks.
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diff --git a/src/main/java/net/minecraft/world/entity/ai/navigation/PathNavigation.java b/src/main/java/net/minecraft/world/entity/ai/navigation/PathNavigation.java
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index 188904c9f0f81db1d63eec953d6746f2dc23dc81..2e9991e6b3c05584002744a2ee2579b1dba218b2 100644
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--- a/src/main/java/net/minecraft/world/entity/ai/navigation/PathNavigation.java
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+++ b/src/main/java/net/minecraft/world/entity/ai/navigation/PathNavigation.java
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@@ -192,13 +192,33 @@ public abstract class PathNavigation {
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return this.moveTo(this.createPath(x, y, z, 1), speed);
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}
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+ // Paper start - Perf: Optimise pathfinding
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+ private int lastFailure = 0;
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+ private int pathfindFailures = 0;
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+ // Paper end - Perf: Optimise pathfinding
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+
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public boolean moveTo(double x, double y, double z, int distance, double speed) {
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return this.moveTo(this.createPath(x, y, z, distance), speed);
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}
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public boolean moveTo(Entity entity, double speed) {
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+ // Paper start - Perf: Optimise pathfinding
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+ if (this.pathfindFailures > 10 && this.path == null && net.minecraft.server.MinecraftServer.currentTick < this.lastFailure + 40) {
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+ return false;
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+ }
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+ // Paper end - Perf: Optimise pathfinding
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Path path = this.createPath(entity, 1);
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- return path != null && this.moveTo(path, speed);
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+ // Paper start - Perf: Optimise pathfinding
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+ if (path != null && this.moveTo(path, speed)) {
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+ this.lastFailure = 0;
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+ this.pathfindFailures = 0;
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+ return true;
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+ } else {
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+ this.pathfindFailures++;
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+ this.lastFailure = net.minecraft.server.MinecraftServer.currentTick;
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+ return false;
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+ }
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+ // Paper end - Perf: Optimise pathfinding
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}
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public boolean moveTo(@Nullable Path path, double speed) {
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