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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 9 May 2020 12:11:47 -0400
Subject: [PATCH] MC-183249: Don't generate Carving Masks BitSet unless needed
This was using SIGNIFICANT amounts of memory allocating many
long[]'s for BitSets for every ProtoChunk in the cache that had
been unloaded and reloaded.
This will result in a nice memory reduction.
diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
index fa893b14bcef9bab6891dea2c4375b09d74ac038..e625842e524f18e469f7695b27d52d4d04892266 100644
--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
+++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
@@ -472,7 +472,12 @@ public class ChunkRegionLoader {
for (int l = 0; l < k; ++l) {
WorldGenStage.Features worldgenstage_features = aworldgenstage_features[l];
- nbttagcompound3.setByteArray(worldgenstage_features.toString(), ichunkaccess.a(worldgenstage_features).toByteArray());
+ // Paper start - don't create carving mask bitsets if not even at that chunk status yet
+ BitSet mask = protochunk.getCarvingMaskIfSet(worldgenstage_features);
+ if (mask != null) {
+ nbttagcompound3.setByteArray(worldgenstage_features.toString(), mask.toByteArray());
+ }
+ // Paper end
}
nbttagcompound1.set("CarvingMasks", nbttagcompound3);
diff --git a/src/main/java/net/minecraft/server/ProtoChunk.java b/src/main/java/net/minecraft/server/ProtoChunk.java
index a78b240621e0407fff67b018224c39fc4f97f4e5..2eb14bbf888f5e5601441743cb7642da6ee1249c 100644
--- a/src/main/java/net/minecraft/server/ProtoChunk.java
+++ b/src/main/java/net/minecraft/server/ProtoChunk.java
@@ -43,7 +43,8 @@ public class ProtoChunk implements IChunkAccess {
private final ProtoChunkTickList<Block> q;
private final ProtoChunkTickList<FluidType> r;
private long s;
- private final Map<WorldGenStage.Features, BitSet> t;
+ private final Map<WorldGenStage.Features, BitSet> t;public BitSet getCarvingMaskIfSet(WorldGenStage.Features worldgenstage_features) { return this.t.get(worldgenstage_features); } // Paper
+ // Paper end
private volatile boolean u;
private final World world; // Paper - Anti-Xray - Add world
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