2021-06-11 14:02:28 +02:00
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Mon, 27 Jan 2020 21:28:00 -0800
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/com/destroystokyo/paper/util/math/ThreadUnsafeRandom.java b/src/main/java/com/destroystokyo/paper/util/math/ThreadUnsafeRandom.java
new file mode 100644
index 0000000000000000000000000000000000000000..3edc8e52e06a62ce9f8cc734fd7458b37cfaad91
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/util/math/ThreadUnsafeRandom.java
@@ -0,0 +1,46 @@
+package com.destroystokyo.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
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index c5070975be1ceeab20ad0b3bab790426adb5e5fa..86ee1b535a6e586fd4e9e3c37f439d81b4508939 100644
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--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
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@@ -667,7 +667,12 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
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});
}
- public void tickChunk(LevelChunk chunk, int randomTickSpeed) {
+ // Paper start - optimise random block ticking
+ private final BlockPos.MutableBlockPos chunkTickMutablePosition = new BlockPos.MutableBlockPos();
+ private final com.destroystokyo.paper.util.math.ThreadUnsafeRandom randomTickRandom = new com.destroystokyo.paper.util.math.ThreadUnsafeRandom();
+ // Paper end
+
+ public void tickChunk(LevelChunk chunk, int randomTickSpeed) { final int randomTickSpeed1 = randomTickSpeed; // Paper
ChunkPos chunkcoordintpair = chunk.getPos();
boolean flag = this.isRaining();
int j = chunkcoordintpair.getMinBlockX();
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@@ -675,10 +680,10 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
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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.random.nextInt(100000) == 0) { // Paper - Disable thunder
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- blockposition = this.findLightningTargetAround(this.getBlockRandomPos(j, 0, k, 15));
+ blockposition.set(this.findLightningTargetAround(this.getBlockRandomPos(j, 0, k, 15))); // Paper
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if (this.isRainingAt(blockposition)) {
DifficultyInstance difficultydamagescaler = this.getCurrentDifficultyAt(blockposition);
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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
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@@ -701,66 +706,81 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
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}
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();
+ if (!this.paperConfig.disableIceAndSnow && this.randomTickRandom.nextInt(16) == 0) { // Paper - Disable ice and snow // Paper - optimise random ticking
+ // Paper start - optimise chunk ticking
+ this.getRandomBlockPosition(j, 0, k, 15, blockposition);
+ int normalY = chunk.getHighestBlockY(Heightmap.Types.MOTION_BLOCKING, blockposition.getX() & 15, blockposition.getZ() & 15);
+ int downY = normalY - 1;
+ blockposition.setY(normalY);
+ // Paper end
Biome biomebase = this.getBiome(blockposition);
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- if (biomebase.shouldFreeze((LevelReader) this, blockposition1)) {
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- 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
}
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if (flag) {
+ blockposition.setY(normalY); // Paper
if (biomebase.shouldSnow(this, blockposition)) {
org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this, blockposition, Blocks.SNOW.defaultBlockState(), null); // CraftBukkit
}
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- BlockState iblockdata = this.getBlockState(blockposition1);
+ blockposition.setY(downY); // Paper
+ BlockState iblockdata = this.getBlockState(blockposition); // Paper
Biome.Precipitation biomebase_precipitation = this.getBiome(blockposition).getPrecipitation();
- if (biomebase_precipitation == Biome.Precipitation.RAIN && biomebase.isColdEnoughToSnow(blockposition1)) {
+ if (biomebase_precipitation == Biome.Precipitation.RAIN && biomebase.isColdEnoughToSnow(blockposition)) { // Paper
biomebase_precipitation = Biome.Precipitation.SNOW;
}
- iblockdata.getBlock().handlePrecipitation(iblockdata, (net.minecraft.world.level.Level) this, blockposition1, biomebase_precipitation);
+ iblockdata.getBlock().handlePrecipitation(iblockdata, (net.minecraft.world.level.Level) this, blockposition, biomebase_precipitation); // Paper
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}
}
- gameprofilerfiller.popPush("tickBlocks");
- timings.chunkTicksBlocks.startTiming(); // Paper
+ // Paper start - optimise random block ticking
+ gameprofilerfiller.pop();
if (randomTickSpeed > 0) {
- LevelChunkSection[] achunksection = chunk.getSections();
- int l = achunksection.length;
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-
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- for (int i1 = 0; i1 < l; ++i1) {
- LevelChunkSection chunksection = achunksection[i1];
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+ gameprofilerfiller.push("randomTick");
+ timings.chunkTicksBlocks.startTiming(); // Paper
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- if (chunksection != LevelChunk.EMPTY_SECTION && chunksection.isRandomlyTicking()) {
- int j1 = chunksection.bottomBlockY();
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+ LevelChunkSection[] sections = chunk.getSections();
- for (int k1 = 0; k1 < randomTickSpeed; ++k1) {
- BlockPos blockposition2 = this.getBlockRandomPos(j, j1, k, 15);
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+ for (int sectionIndex = 0; sectionIndex < 16; ++sectionIndex) {
+ LevelChunkSection section = sections[sectionIndex];
+ if (section == null || section.tickingList.size() == 0) {
+ continue;
+ }
- gameprofilerfiller.push("randomTick");
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- BlockState iblockdata1 = chunksection.getBlockState(blockposition2.getX() - j, blockposition2.getY() - j1, blockposition2.getZ() - k);
+ int yPos = sectionIndex << 4;
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+ for (int a = 0; a < randomTickSpeed1; ++a) {
+ int tickingBlocks = section.tickingList.size();
+ int index = this.randomTickRandom.nextInt(16 * 16 * 16);
+ if (index >= tickingBlocks) {
+ continue;
+ }
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- if (iblockdata1.isRandomlyTicking()) {
- iblockdata1.randomTick(this, blockposition2, this.random);
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- }
+ 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;
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- FluidState fluid = iblockdata1.getFluidState();
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+ BlockPos blockposition2 = blockposition.setValues(j + randomX, randomY, k + randomZ);
+ BlockState iblockdata = com.destroystokyo.paper.util.maplist.IBlockDataList.getBlockDataFromRaw(raw);
- if (fluid.isRandomlyTicking()) {
- fluid.randomTick(this, blockposition2, this.random);
- }
+ iblockdata.randomTick(this, blockposition2, this.randomTickRandom);
- gameprofilerfiller.pop();
- }
+ // We drop the fluid tick since LAVA is ALREADY TICKED by the above method.
+ // TODO CHECK ON UPDATE
}
}
+ gameprofilerfiller.pop();
+ timings.chunkTicksBlocks.stopTiming(); // Paper
+ // Paper end
}
- timings.chunkTicksBlocks.stopTiming(); // Paper
- gameprofilerfiller.pop();
}
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private Optional<BlockPos> findLightningRod(BlockPos pos) {
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diff --git a/src/main/java/net/minecraft/util/BitStorage.java b/src/main/java/net/minecraft/util/BitStorage.java
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index 9b955a027bd2c3cbcfa659a41a6687221c5fea63..6c036335b28258cd8c268173d73707af00d12bf9 100644
2021-06-11 14:02:28 +02:00
--- a/src/main/java/net/minecraft/util/BitStorage.java
+++ b/src/main/java/net/minecraft/util/BitStorage.java
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@@ -105,4 +105,32 @@ public class BitStorage {
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}
}
+
+ // Paper start
+ 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;
+ }
+ }
+ }
+ }
+
+ @FunctionalInterface
+ public static interface DataBitConsumer {
+
+ void accept(int location, int data);
+
+ }
+ // Paper end
}
diff --git a/src/main/java/net/minecraft/world/entity/animal/Turtle.java b/src/main/java/net/minecraft/world/entity/animal/Turtle.java
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index e638d982b4bd1d261a7282cad6dab98ad0b55213..e305173fd1652a8b88ae8a9b94d0fae083e2da95 100644
2021-06-11 14:02:28 +02:00
--- a/src/main/java/net/minecraft/world/entity/animal/Turtle.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Turtle.java
@@ -91,7 +91,7 @@ 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() { // Paper - public
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
2021-06-15 15:20:52 +02:00
index 641f022c4c716e0441a098f4540fd008059a4b51..944b28b55a38352dfb49aeecca3f196502cb04e8 100644
2021-06-11 14:02:28 +02:00
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
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@@ -1305,10 +1305,18 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
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public abstract TagContainer getTagManager();
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 i, int j, int k, 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.setValues(i + (i1 & 15), j + (i1 >> 16 & l), k + (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/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
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index f6b591f045ae992180806fd6aba309c0d04e722b..338e93a1855cf0e535e8a9897cffaff1d2e87279 100644
2021-06-11 14:02:28 +02:00
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
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@@ -568,6 +568,7 @@ public class LevelChunk implements ChunkAccess {
@Override
public void addEntity(Entity entity) {}
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+ public final int getHighestBlockY(Heightmap.Types heightmap_type, int i, int j) { return this.getHeight(heightmap_type, i, j) + 1; } // Paper - sort of an obfhelper, but without -1
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@Override
public int getHeight(Heightmap.Types type, int x, int z) {
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return ((Heightmap) this.heightmaps.get(type)).getFirstAvailable(x & 15, z & 15) - 1;
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
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index b10beabccf5a29098a796e5615eb4632fae95f99..79fda9a003ca4088404d3f0490c0c6a12afa1711 100644
2021-06-11 14:02:28 +02:00
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
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@@ -14,11 +14,12 @@ public class LevelChunkSection {
public static final int SECTION_HEIGHT = 16;
public static final int SECTION_SIZE = 4096;
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public static final Palette<BlockState> GLOBAL_BLOCKSTATE_PALETTE = new GlobalPalette<>(Block.BLOCK_STATE_REGISTRY, Blocks.AIR.defaultBlockState());
- private final int bottomBlockY;
+ final int bottomBlockY; // Paper - private -> package-private
short nonEmptyBlockCount; // Paper - package-private
- private short tickingBlockCount;
+ short tickingBlockCount; // Paper - private -> package-private
private short tickingFluidCount;
final PalettedContainer<BlockState> states; // Paper - package-private
+ public final com.destroystokyo.paper.util.maplist.IBlockDataList tickingList = new com.destroystokyo.paper.util.maplist.IBlockDataList(); // Paper
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// Paper start - Anti-Xray - Add parameters
@Deprecated public LevelChunkSection(int yOffset) { this(yOffset, null, null, true); } // Notice for updates: Please make sure this constructor isn't used anywhere
@@ -79,6 +80,9 @@ public class LevelChunkSection {
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--this.nonEmptyBlockCount;
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if (blockState.isRandomlyTicking()) {
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--this.tickingBlockCount;
+ // Paper start
+ this.tickingList.remove(x, y, z);
+ // Paper end
}
}
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@@ -90,6 +94,9 @@ public class LevelChunkSection {
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++this.nonEmptyBlockCount;
if (state.isRandomlyTicking()) {
++this.tickingBlockCount;
+ // Paper start
+ this.tickingList.add(x, y, z, state);
+ // Paper end
}
}
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@@ -125,22 +132,28 @@ public class LevelChunkSection {
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}
public void recalcBlockCounts() {
+ // Paper start
+ this.tickingList.clear();
+ // Paper end
this.nonEmptyBlockCount = 0;
this.tickingBlockCount = 0;
this.tickingFluidCount = 0;
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- this.states.count((state, count) -> {
+ this.states.forEachLocation((state, location) -> { // Paper
FluidState fluidState = state.getFluidState();
if (!state.isAir()) {
- this.nonEmptyBlockCount = (short)(this.nonEmptyBlockCount + count);
+ this.nonEmptyBlockCount = (short)(this.nonEmptyBlockCount + 1); // Paper
if (state.isRandomlyTicking()) {
- this.tickingBlockCount = (short)(this.tickingBlockCount + count);
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+ // Paper start
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+ this.tickingBlockCount = (short)(this.tickingBlockCount + 1);
+ this.tickingList.add(location, state);
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+ // Paper end
}
}
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if (!fluidState.isEmpty()) {
- this.nonEmptyBlockCount = (short)(this.nonEmptyBlockCount + count);
+ this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + 1); // Paper
if (fluidState.isRandomlyTicking()) {
- this.tickingFluidCount = (short)(this.tickingFluidCount + count);
+ this.tickingFluidCount = (short) (this.tickingFluidCount + 1); // Paper
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}
}
diff --git a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
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index efe4d45b431890e4821f977b8f9fafdab7de3be2..82a4b7969e36940cb694bd999b8c03f9c66a71dc 100644
2021-06-11 14:02:28 +02:00
--- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
+++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
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@@ -312,6 +312,14 @@ public class PalettedContainer<T> implements PaletteResize<T> {
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});
}
+ // Paper start
+ public void forEachLocation(PalettedContainer.CountConsumer<T> datapaletteblock_a) {
+ this.getDataBits().forEach((int location, int data) -> {
+ datapaletteblock_a.accept(this.getDataPalette().getObject(data), location);
+ });
+ }
+ // Paper end
+
@FunctionalInterface
public interface CountConsumer<T> {
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void accept(T object, int count);
