mirror of https://github.com/PaperMC/Paper.git
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@users.noreply.github.com>
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Date: Mon, 6 Apr 2020 17:39:25 -0700
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Subject: [PATCH] Reduce memory footprint of CompoundTag
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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/nbt/CompoundTag.java b/src/main/java/net/minecraft/nbt/CompoundTag.java
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index 1cbc42c44911b71dfadebc2d60e0e5cb9b6cafe6..df246d69591e1a5822a0109c99b0f67996da71fa 100644
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--- a/src/main/java/net/minecraft/nbt/CompoundTag.java
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+++ b/src/main/java/net/minecraft/nbt/CompoundTag.java
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@@ -49,7 +49,7 @@ public class CompoundTag implements Tag {
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private static CompoundTag loadCompound(DataInput input, NbtAccounter tracker) throws IOException {
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tracker.accountBytes(48L);
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- Map<String, Tag> map = Maps.newHashMap();
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+ it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<String, Tag> map = new it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<>(8, 0.8f); // Paper - Reduce memory footprint of CompoundTag
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byte b;
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while ((b = input.readByte()) != 0) {
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@@ -166,7 +166,7 @@ public class CompoundTag implements Tag {
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}
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public CompoundTag() {
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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 CompoundTag
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}
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@Override
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@@ -481,8 +481,16 @@ public class CompoundTag implements Tag {
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@Override
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public CompoundTag copy() {
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- Map<String, Tag> map = Maps.newHashMap(Maps.transformValues(this.tags, Tag::copy));
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- return new CompoundTag(map);
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+ // Paper start - Reduce memory footprint of CompoundTag
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+ it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<String, Tag> ret = new it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<>(this.tags.size(), 0.8f);
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+ java.util.Iterator<java.util.Map.Entry<String, Tag>> iterator = (this.tags instanceof it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap) ? ((it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap)this.tags).object2ObjectEntrySet().fastIterator() : this.tags.entrySet().iterator();
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+ while (iterator.hasNext()) {
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+ Map.Entry<String, Tag> entry = iterator.next();
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+ ret.put(entry.getKey(), entry.getValue().copy());
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+ }
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+
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+ return new CompoundTag(ret);
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+ // Paper end - Reduce memory footprint of CompoundTag
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}
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@Override
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