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994679a0c9
Tux pointed out the patch still has O(n^2) time complexity since the sublist class in arraylist does not override clear() from AbstractList, which uses a forward moving iterator to clear the list. Resolved by using a peek and poll from ArrayDeque. This patch also removes the useless WeakHashMap which holds the list (it mapped world->list) and replaces it with a field on World.
26 lines
1.3 KiB
Diff
26 lines
1.3 KiB
Diff
From 4a06cdf0e8a73013b84c46cd67d12b3cec8cbfb4 Mon Sep 17 00:00:00 2001
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From: mezz <tehgeek@gmail.com>
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Date: Wed, 9 Aug 2017 17:51:22 -0500
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Subject: [PATCH] Fix MC-117075: TE Unload Lag Spike
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diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
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index 8ac081bef..f9413dd68 100644
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--- a/src/main/java/net/minecraft/server/World.java
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+++ b/src/main/java/net/minecraft/server/World.java
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@@ -730,7 +730,11 @@ public abstract class World implements IIBlockAccess, GeneratorAccess, AutoClose
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gameprofilerfiller.enter("blockEntities");
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timings.tileEntityTick.startTiming(); // Spigot
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if (!this.tileEntityListUnload.isEmpty()) {
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- this.tileEntityListTick.removeAll(this.tileEntityListUnload);
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+ // Paper start - Use alternate implementation with faster contains
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+ java.util.Set<TileEntity> toRemove = java.util.Collections.newSetFromMap(new java.util.IdentityHashMap<>());
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+ toRemove.addAll(tileEntityListUnload);
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+ this.tileEntityListTick.removeAll(toRemove);
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+ // Paper end
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//this.tileEntityList.removeAll(this.tileEntityListUnload); // Paper - remove unused list
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this.tileEntityListUnload.clear();
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}
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--
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2.21.0
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