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papermc/patches/server/0376-Optimise-random-block-ticking.patch
Jason Penilla 4d40e87b33
Update sync chunk load debug patch 
Had to drop some hunks modifying getEntities, as those methods were rewritten by Mojang in 1.17
2021-06-15 17:50:38 -07:00

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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
index 0eed1e0c2c87f9c5ab14ad2d4971e3724ab2135d..69207f264d68e7181b8d3681ac18e0f9c5d74ec8 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -673,7 +673,12 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
});
}
- 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();
@@ -681,10 +686,10 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
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
- 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
@@ -707,66 +712,81 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
}
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);
- if (biomebase.shouldFreeze((LevelReader) 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);
+ 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
}
}
- 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;
-
- for (int i1 = 0; i1 < l; ++i1) {
- LevelChunkSection chunksection = achunksection[i1];
+ gameprofilerfiller.push("randomTick");
+ timings.chunkTicksBlocks.startTiming(); // Paper
- if (chunksection != LevelChunk.EMPTY_SECTION && chunksection.isRandomlyTicking()) {
- int j1 = chunksection.bottomBlockY();
+ LevelChunkSection[] sections = chunk.getSections();
- for (int k1 = 0; k1 < randomTickSpeed; ++k1) {
- BlockPos blockposition2 = this.getBlockRandomPos(j, j1, k, 15);
+ for (int sectionIndex = 0; sectionIndex < 16; ++sectionIndex) {
+ LevelChunkSection section = sections[sectionIndex];
+ if (section == null || section.tickingList.size() == 0) {
+ continue;
+ }
- gameprofilerfiller.push("randomTick");
- BlockState iblockdata1 = chunksection.getBlockState(blockposition2.getX() - j, blockposition2.getY() - j1, blockposition2.getZ() - k);
+ int yPos = sectionIndex << 4;
+ for (int a = 0; a < randomTickSpeed1; ++a) {
+ int tickingBlocks = section.tickingList.size();
+ int index = this.randomTickRandom.nextInt(16 * 16 * 16);
+ if (index >= tickingBlocks) {
+ continue;
+ }
- if (iblockdata1.isRandomlyTicking()) {
- iblockdata1.randomTick(this, blockposition2, this.random);
- }
+ 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;
- FluidState fluid = iblockdata1.getFluidState();
+ 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();
}
private Optional<BlockPos> findLightningRod(BlockPos pos) {
diff --git a/src/main/java/net/minecraft/util/BitStorage.java b/src/main/java/net/minecraft/util/BitStorage.java
index 9b955a027bd2c3cbcfa659a41a6687221c5fea63..6c036335b28258cd8c268173d73707af00d12bf9 100644
--- a/src/main/java/net/minecraft/util/BitStorage.java
+++ b/src/main/java/net/minecraft/util/BitStorage.java
@@ -105,4 +105,32 @@ public class BitStorage {
}
}
+
+ // 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
index 925f16d5eb092518ef774f69a8d99689feb0f5d7..01d8af06f19427354cac95d691e65d31253fef94 100644
--- 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
index f3b100976a374cf9f1c3473788e9ff5b55f00ff5..3468c331208978f37dfed96b02be950e019f8a40 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -1305,10 +1305,18 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
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
index a088cb005525fda2c9d5521ab3bac43cfa38a393..1782be43f1dbe2776abe5087d305e271c62285dd 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -568,6 +568,7 @@ public class LevelChunk implements ChunkAccess {
@Override
public void addEntity(Entity entity) {}
+ 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
@Override
public int getHeight(Heightmap.Types type, int x, int z) {
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
index b10beabccf5a29098a796e5615eb4632fae95f99..79fda9a003ca4088404d3f0490c0c6a12afa1711 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
@@ -14,11 +14,12 @@ public class LevelChunkSection {
public static final int SECTION_HEIGHT = 16;
public static final int SECTION_SIZE = 4096;
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
// 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 {
--this.nonEmptyBlockCount;
if (blockState.isRandomlyTicking()) {
--this.tickingBlockCount;
+ // Paper start
+ this.tickingList.remove(x, y, z);
+ // Paper end
}
}
@@ -90,6 +94,9 @@ public class LevelChunkSection {
++this.nonEmptyBlockCount;
if (state.isRandomlyTicking()) {
++this.tickingBlockCount;
+ // Paper start
+ this.tickingList.add(x, y, z, state);
+ // Paper end
}
}
@@ -125,22 +132,28 @@ public class LevelChunkSection {
}
public void recalcBlockCounts() {
+ // Paper start
+ this.tickingList.clear();
+ // Paper end
this.nonEmptyBlockCount = 0;
this.tickingBlockCount = 0;
this.tickingFluidCount = 0;
- 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);
+ // Paper start
+ this.tickingBlockCount = (short)(this.tickingBlockCount + 1);
+ this.tickingList.add(location, state);
+ // Paper end
}
}
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
}
}
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 efe4d45b431890e4821f977b8f9fafdab7de3be2..82a4b7969e36940cb694bd999b8c03f9c66a71dc 100644
--- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
+++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
@@ -312,6 +312,14 @@ public class PalettedContainer<T> implements PaletteResize<T> {
});
}
+ // 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> {
void accept(T object, int count);
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