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Paper/patches/server/Optimise-random-block-ticking.patch
Nassim Jahnke 0050f4edf4 Updated Upstream (Bukkit/CraftBukkit/Spigot) (#6823) 
Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
58c2d3c7 SPIGOT-6771: Help command tab completion does not respect permissions

CraftBukkit Changes:
fd50041d SPIGOT-6768: Remove upper bound on setFreezeTicks

Spigot Changes:
38929296 SPIGOT-6767: Configurable Thunder Chance
2021-10-24 19:38:23 +02:00

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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..0000000000000000000000000000000000000000
--- /dev/null
+++ b/src/main/java/io/papermc/paper/util/math/ThreadUnsafeRandom.java
@@ -0,0 +0,0 @@
+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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -0,0 +0,0 @@ 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();
@@ -0,0 +0,0 @@ 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
@@ -0,0 +0,0 @@ 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();
+ 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.getHeight(Heightmap.Types.MOTION_BLOCKING, blockposition.getX() & 15, blockposition.getZ() & 15) + 1;
+ 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
+ blockposition.setY(normalY); // Paper
Biome.Precipitation biomebase_precipitation = this.getBiome(blockposition).getPrecipitation();
- if (biomebase_precipitation == Biome.Precipitation.RAIN && biomebase.isColdEnoughToSnow(blockposition1)) {
+ blockposition.setY(downY); // Paper
+ if (biomebase_precipitation == Biome.Precipitation.RAIN && biomebase.isColdEnoughToSnow(blockposition)) { // Paper
biomebase_precipitation = Biome.Precipitation.SNOW;
}
- iblockdata.getBlock().handlePrecipitation(iblockdata, (Level) this, blockposition1, biomebase_precipitation);
+ iblockdata.getBlock().handlePrecipitation(iblockdata, (Level) 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 != LevelChunk.EMPTY_SECTION && 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/util/BitStorage.java
+++ b/src/main/java/net/minecraft/util/BitStorage.java
@@ -0,0 +0,0 @@ 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Turtle.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Turtle.java
@@ -0,0 +0,0 @@ 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -0,0 +0,0 @@ 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 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
@@ -0,0 +0,0 @@ public class LevelChunkSection {
private short tickingBlockCount;
private short tickingFluidCount;
public final PalettedContainer<BlockState> states; // Paper - package-private // Paper - public
+ 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
@@ -0,0 +0,0 @@ public class LevelChunkSection {
--this.nonEmptyBlockCount;
if (blockState.isRandomlyTicking()) {
--this.tickingBlockCount;
+ // Paper start
+ this.tickingList.remove(x, y, z);
+ // Paper end
}
}
@@ -0,0 +0,0 @@ public class LevelChunkSection {
++this.nonEmptyBlockCount;
if (state.isRandomlyTicking()) {
++this.tickingBlockCount;
+ // Paper start
+ this.tickingList.add(x, y, z, state);
+ // Paper end
}
}
@@ -0,0 +0,0 @@ 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
+++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
@@ -0,0 +0,0 @@ public class PalettedContainer<T> implements PaletteResize<T> {
public interface CountConsumer<T> {
void accept(T object, int count);
}
+
+ // Paper start
+ public void forEachLocation(PalettedContainer.CountConsumer<T> datapaletteblock_a) {
+ this.storage.forEach((int location, int data) -> {
+ datapaletteblock_a.accept(this.palette.valueFor(data), location);
+ });
+ }
+ // Paper end
}
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