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51 lines
2.6 KiB
Diff
51 lines
2.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <spottedleaf@spottedleaf.dev>
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Date: Mon, 6 Apr 2020 17:39:25 -0700
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Subject: [PATCH] Reduce memory footprint of NBTTagCompound
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Fastutil maps are going to have a lower memory footprint - which
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is important because we clone chunk data after reading it for safety.
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So, reduce the impact of the clone on GC.
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diff --git a/src/main/java/net/minecraft/server/NBTTagCompound.java b/src/main/java/net/minecraft/server/NBTTagCompound.java
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index 9c445902e6adc05773497bc4444203ca364e4f5c..f608b35502890650adfc1df35e0794471f57ecbc 100644
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--- a/src/main/java/net/minecraft/server/NBTTagCompound.java
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+++ b/src/main/java/net/minecraft/server/NBTTagCompound.java
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@@ -41,7 +41,7 @@ public class NBTTagCompound implements NBTBase {
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if (i > 512) {
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throw new RuntimeException("Tried to read NBT tag with too high complexity, depth > 512");
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} else {
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- HashMap hashmap = Maps.newHashMap();
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+ it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<String, NBTBase> hashmap = new it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<>(8, 0.8f); // Paper - reduce memory footprint of NBTTagCompound
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byte b0;
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@@ -77,7 +77,7 @@ public class NBTTagCompound implements NBTBase {
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}
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public NBTTagCompound() {
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- this(Maps.newHashMap());
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+ this(new it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<>(8, 0.8f)); // Paper - reduce memory footprint of NBTTagCompound
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}
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@Override
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@@ -409,9 +409,17 @@ public class NBTTagCompound implements NBTBase {
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@Override
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public NBTTagCompound clone() {
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- Map<String, NBTBase> map = Maps.newHashMap(Maps.transformValues(this.map, NBTBase::clone));
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+ // Paper start - reduce memory footprint of NBTTagCompound
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+ it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<String, NBTBase> ret = new it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<>(this.map.size(), 0.8f);
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- return new NBTTagCompound(map);
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+ Iterator<Map.Entry<String, NBTBase>> iterator = (this.map instanceof it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap) ? ((it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap)this.map).object2ObjectEntrySet().fastIterator() : this.map.entrySet().iterator();
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+ while (iterator.hasNext()) {
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+ Map.Entry<String, NBTBase> entry = iterator.next();
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+ ret.put(entry.getKey(), entry.getValue().clone());
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+ }
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+
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+ return new NBTTagCompound(ret);
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+ // Paper end - reduce memory footprint of NBTTagCompound
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}
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public boolean equals(Object object) {
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