path: root/patches/server/0765-Optimise-random-block-ticking.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 20 Jun 2021 16:19:26 -0700
Subject: [PATCH] Optimise random block ticking

Massive performance improvement for random block ticking.
The performance increase comes from the fact that the vast
majority of attempted block ticks (~95% in my testing) fail
because the randomly selected block is not tickable.

Now only tickable blocks are targeted, however this means that
the maximum number of block ticks occurs per chunk. However,
not all chunks are going to be targeted. The percent chance
of a chunk being targeted is based on how many tickable blocks
are in the chunk.
This means that while block ticks are spread out less, the
total number of blocks ticked per world tick remains the same.
Therefore, the chance of a random tickable block being ticked
remains the same.

diff --git a/src/main/java/io/papermc/paper/util/math/ThreadUnsafeRandom.java b/src/main/java/io/papermc/paper/util/math/ThreadUnsafeRandom.java
new file mode 100644
index 0000000000000000000000000000000000000000..e8b4053babe46999980b92643125405064af1c04
--- /dev/null
+++ b/src/main/java/io/papermc/paper/util/math/ThreadUnsafeRandom.java
@@ -0,0 +1,46 @@
+package io.papermc.paper.util.math;
+
+import java.util.Random;
+
+public final class ThreadUnsafeRandom extends Random {
+
+    // See javadoc and internal comments for java.util.Random where these values come from, how they are used, and the author for them.
+    private static final long multiplier = 0x5DEECE66DL;
+    private static final long addend = 0xBL;
+    private static final long mask = (1L << 48) - 1;
+
+    private static long initialScramble(long seed) {
+        return (seed ^ multiplier) & mask;
+    }
+
+    private long seed;
+
+    @Override
+    public void setSeed(long seed) {
+        // note: called by Random constructor
+        this.seed = initialScramble(seed);
+    }
+
+    @Override
+    protected int next(int bits) {
+        // avoid the expensive CAS logic used by superclass
+        return (int) (((this.seed = this.seed * multiplier + addend) & mask) >>> (48 - bits));
+    }
+
+    // Taken from
+    // https://lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/
+    // https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/blob/master/2016/06/25/fastrange.c
+    // Original license is public domain
+    public static int fastRandomBounded(final long randomInteger, final long limit) {
+        // randomInteger must be [0, pow(2, 32))
+        // limit must be [0, pow(2, 32))
+        return (int)((randomInteger * limit) >>> 32);
+    }
+
+    @Override
+    public int nextInt(int bound) {
+        // yes this breaks random's spec
+        // however there's nothing that uses this class that relies on it
+        return fastRandomBounded(this.next(32) & 0xFFFFFFFFL, bound);
+    }
+}
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 9fa7a01db61ba91b79eda4f7e4fd4f0001712808..6dee3e414e378538e6b5ef93dc1414e0128cffbb 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -645,6 +645,10 @@ public class ServerLevel extends Level implements WorldGenLevel {
             entityplayer.stopSleepInBed(false, false);
         });
     }
+    // Paper start - optimise random block ticking
+    private final BlockPos.MutableBlockPos chunkTickMutablePosition = new BlockPos.MutableBlockPos();
+    private final io.papermc.paper.util.math.ThreadUnsafeRandom randomTickRandom = new io.papermc.paper.util.math.ThreadUnsafeRandom();
+    // Paper end
 
     public void tickChunk(LevelChunk chunk, int randomTickSpeed) {
         ChunkPos chunkcoordintpair = chunk.getPos();
@@ -654,10 +658,10 @@ public class ServerLevel extends Level implements WorldGenLevel {
         ProfilerFiller gameprofilerfiller = this.getProfiler();
 
         gameprofilerfiller.push("thunder");
-        BlockPos blockposition;
+        final BlockPos.MutableBlockPos blockposition = this.chunkTickMutablePosition; // Paper - use mutable to reduce allocation rate, final to force compile fail on change
 
         if (!this.paperConfig.disableThunder && flag && this.isThundering() && this.spigotConfig.thunderChance > 0 && this.random.nextInt(this.spigotConfig.thunderChance) == 0) { // Spigot // Paper - disable thunder
-            blockposition = this.findLightningTargetAround(this.getBlockRandomPos(j, 0, k, 15));
+            blockposition.set(this.findLightningTargetAround(this.getBlockRandomPos(j, 0, k, 15))); // Paper
             if (this.isRainingAt(blockposition)) {
                 DifficultyInstance difficultydamagescaler = this.getCurrentDifficultyAt(blockposition);
                 boolean flag1 = this.getGameRules().getBoolean(GameRules.RULE_DOMOBSPAWNING) && this.random.nextDouble() < (double) difficultydamagescaler.getEffectiveDifficulty() * paperConfig.skeleHorseSpawnChance && !this.getBlockState(blockposition.below()).is(Blocks.LIGHTNING_ROD); // Paper
@@ -681,64 +685,75 @@ public class ServerLevel extends Level implements WorldGenLevel {
 
         gameprofilerfiller.popPush("iceandsnow");
         if (!this.paperConfig.disableIceAndSnow && this.random.nextInt(16) == 0) { // Paper - Disable ice and snow
-            blockposition = this.getHeightmapPos(Heightmap.Types.MOTION_BLOCKING, this.getBlockRandomPos(j, 0, k, 15));
-            BlockPos blockposition1 = blockposition.below();
+            // Paper start - optimise chunk ticking
+            this.getRandomBlockPosition(j, 0, k, 15, blockposition);
+            int normalY = chunk.getHeight(Heightmap.Types.MOTION_BLOCKING, blockposition.getX() & 15, blockposition.getZ() & 15) + 1;
+            int downY = normalY - 1;
+            blockposition.setY(normalY);
+            // Paper end
             Biome biomebase = (Biome) this.getBiome(blockposition).value();
 
-            if (biomebase.shouldFreeze(this, blockposition1)) {
-                org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this, blockposition1, Blocks.ICE.defaultBlockState(), null); // CraftBukkit
+            // Paper start - optimise chunk ticking
+            blockposition.setY(downY);
+            if (biomebase.shouldFreeze(this, blockposition)) {
+                org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this, blockposition, Blocks.ICE.defaultBlockState(), null); // CraftBukkit
+                // Paper end
             }
 
             if (flag) {
+                blockposition.setY(normalY); // Paper
                 if (biomebase.shouldSnow(this, blockposition)) {
                     org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this, blockposition, Blocks.SNOW.defaultBlockState(), null); // CraftBukkit
                 }
 
-                BlockState iblockdata = this.getBlockState(blockposition1);
+                BlockState iblockdata = this.getBlockState(blockposition); // Paper
                 Biome.Precipitation biomebase_precipitation = biomebase.getPrecipitation();
 
-                if (biomebase_precipitation == Biome.Precipitation.RAIN && biomebase.coldEnoughToSnow(blockposition1)) {
+                blockposition.setY(downY); // Paper
+                if (biomebase_precipitation == Biome.Precipitation.RAIN && biomebase.coldEnoughToSnow(blockposition)) { // Paper
                     biomebase_precipitation = Biome.Precipitation.SNOW;
                 }
 
-                iblockdata.getBlock().handlePrecipitation(iblockdata, this, blockposition1, biomebase_precipitation);
+                iblockdata.getBlock().handlePrecipitation(iblockdata, this, blockposition, biomebase_precipitation); // Paper
             }
         }
 
-        gameprofilerfiller.popPush("tickBlocks");
+        // Paper start - optimise random block ticking
+        gameprofilerfiller.popPush("randomTick");
         timings.chunkTicksBlocks.startTiming(); // Paper
         if (randomTickSpeed > 0) {
-            LevelChunkSection[] achunksection = chunk.getSections();
-            int l = achunksection.length;
-
-            for (int i1 = 0; i1 < l; ++i1) {
-                LevelChunkSection chunksection = achunksection[i1];
-
-                if (chunksection.isRandomlyTicking()) {
-                    int j1 = chunksection.bottomBlockY();
-
-                    for (int k1 = 0; k1 < randomTickSpeed; ++k1) {
-                        BlockPos blockposition2 = this.getBlockRandomPos(j, j1, k, 15);
-
-                        gameprofilerfiller.push("randomTick");
-                        BlockState iblockdata1 = chunksection.getBlockState(blockposition2.getX() - j, blockposition2.getY() - j1, blockposition2.getZ() - k);
+            LevelChunkSection[] sections = chunk.getSections();
+            int minSection = io.papermc.paper.util.WorldUtil.getMinSection(this);
+            for (int sectionIndex = 0; sectionIndex < sections.length; ++sectionIndex) {
+                LevelChunkSection section = sections[sectionIndex];
+                if (section == null || section.tickingList.size() == 0) {
+                    continue;
+                }
 
-                        if (iblockdata1.isRandomlyTicking()) {
-                            iblockdata1.randomTick(this, blockposition2, this.random);
-                        }
+                int yPos = (sectionIndex + minSection) << 4;
+                for (int a = 0; a < randomTickSpeed; ++a) {
+                    int tickingBlocks = section.tickingList.size();
+                    int index = this.randomTickRandom.nextInt(16 * 16 * 16);
+                    if (index >= tickingBlocks) {
+                        continue;
+                    }
 
-                        FluidState fluid = iblockdata1.getFluidState();
+                    long raw = section.tickingList.getRaw(index);
+                    int location = com.destroystokyo.paper.util.maplist.IBlockDataList.getLocationFromRaw(raw);
+                    int randomX = location & 15;
+                    int randomY = ((location >>> (4 + 4)) & 255) | yPos;
+                    int randomZ = (location >>> 4) & 15;
 
-                        if (fluid.isRandomlyTicking()) {
-                            fluid.randomTick(this, blockposition2, this.random);
-                        }
+                    BlockPos blockposition2 = blockposition.set(j + randomX, randomY, k + randomZ);
+                    BlockState iblockdata = com.destroystokyo.paper.util.maplist.IBlockDataList.getBlockDataFromRaw(raw);
 
-                        gameprofilerfiller.pop();
-                    }
+                    iblockdata.randomTick(this, blockposition2, this.randomTickRandom);
+                    // We drop the fluid tick since LAVA is ALREADY TICKED by the above method (See LiquidBlock).
+                    // TODO CHECK ON UPDATE
                 }
             }
         }
-
+        // Paper end - optimise random block ticking
         timings.chunkTicksBlocks.stopTiming(); // Paper
         gameprofilerfiller.pop();
     }
diff --git a/src/main/java/net/minecraft/util/BitStorage.java b/src/main/java/net/minecraft/util/BitStorage.java
index 62251727788d48a461ea6f7945771d7d6bdc7282..106610ccc74b70b557b01c61262d56c4f1147acf 100644
--- a/src/main/java/net/minecraft/util/BitStorage.java
+++ b/src/main/java/net/minecraft/util/BitStorage.java
@@ -20,4 +20,15 @@ public interface BitStorage {
     void unpack(int[] is);
 
     BitStorage copy();
+
+    // Paper start
+    void forEach(DataBitConsumer consumer);
+
+    @FunctionalInterface
+    interface DataBitConsumer {
+
+        void accept(int location, int data);
+
+    }
+    // Paper end
 }
diff --git a/src/main/java/net/minecraft/util/SimpleBitStorage.java b/src/main/java/net/minecraft/util/SimpleBitStorage.java
index 6426d6c2c31ead49444fe56e2230266290fa79dd..881a2318aac72526e0451688af58c620e4f525d1 100644
--- a/src/main/java/net/minecraft/util/SimpleBitStorage.java
+++ b/src/main/java/net/minecraft/util/SimpleBitStorage.java
@@ -124,6 +124,28 @@ public class SimpleBitStorage implements BitStorage {
         return this.bits;
     }
 
+    // Paper start
+    @Override
+    public final void forEach(DataBitConsumer consumer) {
+        int i = 0;
+        long[] along = this.data;
+        int j = along.length;
+
+        for (int k = 0; k < j; ++k) {
+            long l = along[k];
+
+            for (int i1 = 0; i1 < this.valuesPerLong; ++i1) {
+                consumer.accept(i, (int) (l & this.mask));
+                l >>= this.bits;
+                ++i;
+                if (i >= this.size) {
+                    return;
+                }
+            }
+        }
+    }
+    // Paper end
+
     @Override
     public void getAll(IntConsumer action) {
         int i = 0;
diff --git a/src/main/java/net/minecraft/util/ZeroBitStorage.java b/src/main/java/net/minecraft/util/ZeroBitStorage.java
index 9686ce7536c9924b1b2aced4f013f46759cbc72e..5d8e9bdf5538b19681f21949368d862fab8a89ad 100644
--- a/src/main/java/net/minecraft/util/ZeroBitStorage.java
+++ b/src/main/java/net/minecraft/util/ZeroBitStorage.java
@@ -46,6 +46,15 @@ public class ZeroBitStorage implements BitStorage {
         return 0;
     }
 
+    // Paper start
+    @Override
+    public void forEach(DataBitConsumer consumer) {
+        for(int i = 0; i < this.size; ++i) {
+            consumer.accept(i, 0);
+        }
+    }
+    // Paper end
+
     @Override
     public void getAll(IntConsumer action) {
         for(int i = 0; i < this.size; ++i) {
diff --git a/src/main/java/net/minecraft/world/entity/animal/Turtle.java b/src/main/java/net/minecraft/world/entity/animal/Turtle.java
index 1b0be28ebfd7ec2f978b5d87f6d26e4d5913fb06..ac17fd4454730db831cf9b781963062db8614bb7 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Turtle.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Turtle.java
@@ -85,7 +85,7 @@ public class Turtle extends Animal {
     }
 
     public void setHomePos(BlockPos pos) {
-        this.entityData.set(Turtle.HOME_POS, pos);
+        this.entityData.set(Turtle.HOME_POS, pos.immutable()); // Paper - called with mutablepos...
     }
 
     public BlockPos getHomePos() {
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 843c36a8272ea5affe0a4f3baa9e15823ad74059..67cb2f94f1f2f2b8ae82d65e19b7f173157076b9 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -1318,10 +1318,18 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
     public abstract RecipeManager getRecipeManager();
 
     public BlockPos getBlockRandomPos(int x, int y, int z, int l) {
+        // Paper start - allow use of mutable pos
+        BlockPos.MutableBlockPos ret = new BlockPos.MutableBlockPos();
+        this.getRandomBlockPosition(x, y, z, l, ret);
+        return ret.immutable();
+    }
+    public final BlockPos.MutableBlockPos getRandomBlockPosition(int x, int y, int z, int l, BlockPos.MutableBlockPos out) {
+        // Paper end
         this.randValue = this.randValue * 3 + 1013904223;
         int i1 = this.randValue >> 2;
 
-        return new BlockPos(x + (i1 & 15), y + (i1 >> 16 & l), z + (i1 >> 8 & 15));
+        out.set(x + (i1 & 15), y + (i1 >> 16 & l), z + (i1 >> 8 & 15)); // Paper - change to setValues call
+        return out; // Paper
     }
 
     public boolean noSave() {
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
index cdd17e501c678a4f4bebbaaccdaec1682351e2f2..6afad987f6dd1fd7243dfa6c50549c2a88768962 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
@@ -26,6 +26,7 @@ public class LevelChunkSection {
     private short tickingFluidCount;
     public final PalettedContainer<BlockState> states;
     private final PalettedContainer<Holder<Biome>> biomes;
+    public final com.destroystokyo.paper.util.maplist.IBlockDataList tickingList = new com.destroystokyo.paper.util.maplist.IBlockDataList(); // Paper
 
     public LevelChunkSection(int chunkPos, PalettedContainer<BlockState> blockStateContainer, PalettedContainer<Holder<Biome>> biomeContainer) {
         this.bottomBlockY = LevelChunkSection.getBottomBlockY(chunkPos);
@@ -83,6 +84,9 @@ public class LevelChunkSection {
             --this.nonEmptyBlockCount;
             if (iblockdata1.isRandomlyTicking()) {
                 --this.tickingBlockCount;
+                // Paper start
+                this.tickingList.remove(x, y, z);
+                // Paper end
             }
         }
 
@@ -94,6 +98,9 @@ public class LevelChunkSection {
             ++this.nonEmptyBlockCount;
             if (state.isRandomlyTicking()) {
                 ++this.tickingBlockCount;
+                // Paper start
+                this.tickingList.add(x, y, z, state);
+                // Paper end
             }
         }
 
@@ -125,40 +132,31 @@ public class LevelChunkSection {
     }
 
     public void recalcBlockCounts() {
-        class a implements PalettedContainer.CountConsumer<BlockState> {
-
-            public int nonEmptyBlockCount;
-            public int tickingBlockCount;
-            public int tickingFluidCount;
-
-            a() {}
-
-            public void accept(BlockState iblockdata, int i) {
-                FluidState fluid = iblockdata.getFluidState();
-
-                if (!iblockdata.isAir()) {
-                    this.nonEmptyBlockCount += i;
-                    if (iblockdata.isRandomlyTicking()) {
-                        this.tickingBlockCount += i;
-                    }
+        // Paper start - unfuck this
+        this.tickingList.clear();
+        this.nonEmptyBlockCount = 0;
+        this.tickingBlockCount = 0;
+        this.tickingFluidCount = 0;
+        this.states.forEachLocation((BlockState iblockdata, int i) -> {
+            FluidState fluid = iblockdata.getFluidState();
+
+            if (!iblockdata.isAir()) {
+                this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + 1);
+                if (iblockdata.isRandomlyTicking()) {
+                    this.tickingBlockCount = (short)(this.tickingBlockCount + 1);
+                    this.tickingList.add(i, iblockdata);
                 }
+            }
 
-                if (!fluid.isEmpty()) {
-                    this.nonEmptyBlockCount += i;
-                    if (fluid.isRandomlyTicking()) {
-                        this.tickingFluidCount += i;
-                    }
+            if (!fluid.isEmpty()) {
+                this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + 1);
+                if (fluid.isRandomlyTicking()) {
+                    this.tickingFluidCount = (short) (this.tickingFluidCount + 1);
                 }
-
             }
-        }
 
-        a a0 = new a();
-
-        this.states.count(a0);
-        this.nonEmptyBlockCount = (short) a0.nonEmptyBlockCount;
-        this.tickingBlockCount = (short) a0.tickingBlockCount;
-        this.tickingFluidCount = (short) a0.tickingFluidCount;
+        });
+        // Paper end
     }
 
     public PalettedContainer<BlockState> getStates() {
diff --git a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
index 83dc9550f4ed2a138d4ece2765273e555cda994a..65afcb24f6274d30ebf8598ffce291537128858a 100644
--- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
+++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
@@ -355,6 +355,14 @@ public class PalettedContainer<T> implements PaletteResize<T> {
         }
     }
 
+    // Paper start
+    public void forEachLocation(PalettedContainer.CountConsumer<T> consumer) {
+        this.data.storage.forEach((int location, int data) -> {
+            consumer.accept(this.data.palette.valueFor(data), location);
+        });
+    }
+    // Paper end
+
     @FunctionalInterface
     public interface CountConsumer<T> {
         void accept(T object, int count);