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Paper/Spigot-Server-Patches/0413-Optimise-random-block-ticking.patch
Daniel Ennis c97ce029e9
1.16.2 Release (#4123) 
PaperMC believes that 1.16.2 is now ready for general release as we fixed the main issue plagueing the 1.16.x release, the MapLike data conversion issues.

Until now, it was not safe for a server to convert a world to 1.16.2 without data conversion issues around villages and potentially other things. If you did, those MapLike errors meant something went wrong.

This is now resolved.

Big thanks to all those that helped, notably @BillyGalbreath and @Proximyst who did large parts of the update process with me.

Please as always, backup your worlds and test before updating to 1.16.2!

If you update to 1.16.2, there is no going back to an older build than this.

---------------------------------

Co-authored-by: William Blake Galbreath <Blake.Galbreath@GMail.com>
Co-authored-by: Mariell Hoversholm <proximyst@proximyst.com>
Co-authored-by: krolik-exe <69214078+krolik-exe@users.noreply.github.com>
Co-authored-by: BillyGalbreath <BillyGalbreath@users.noreply.github.com>
Co-authored-by: stonar96 <minecraft.stonar96@gmail.com>
Co-authored-by: Shane Freeder <theboyetronic@gmail.com>
Co-authored-by: Jason <jasonpenilla2@me.com>
Co-authored-by: kashike <kashike@vq.lc>
Co-authored-by: Aurora <21148213+aurorasmiles@users.noreply.github.com>
Co-authored-by: KennyTV <kennytv@t-online.de>
Co-authored-by: commandblockguy <commandblockguy1@gmail.com>
Co-authored-by: DigitalRegent <misterwener@gmail.com>
Co-authored-by: ishland <ishlandmc@yeah.net>
2020-08-24 22:40:19 -04:00

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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/BlockPosition.java b/src/main/java/net/minecraft/server/BlockPosition.java
index f068436960c96b0df427bcdf337a4dcc6a9f66f5..253423acc3c3697a5e47136f34da92617e719753 100644
--- a/src/main/java/net/minecraft/server/BlockPosition.java
+++ b/src/main/java/net/minecraft/server/BlockPosition.java
@@ -462,6 +462,7 @@ public class BlockPosition extends BaseBlockPosition {
return this.d(MathHelper.floor(d0), MathHelper.floor(d1), MathHelper.floor(d2));
}
+ public final BlockPosition.MutableBlockPosition setValues(final BaseBlockPosition baseblockposition) { return this.g(baseblockposition); } // Paper - OBFHELPER
public BlockPosition.MutableBlockPosition g(BaseBlockPosition baseblockposition) {
return this.d(baseblockposition.getX(), baseblockposition.getY(), baseblockposition.getZ());
}
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index a6cd89e0850c11ab6dd7f77842583c456c7f93dd..20c3e425f4299318c49128f3d330b889a0c1c52a 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -593,8 +593,8 @@ public class Chunk implements IChunkAccess {
this.entities.remove(entity); // Paper
}
- @Override
- public int getHighestBlock(HeightMap.Type heightmap_type, int i, int j) {
+ public final int getHighestBlockY(HeightMap.Type heightmap_type, int i, int j) { return this.getHighestBlock(heightmap_type, i, j) + 1; } // Paper - sort of an obfhelper, but without -1
+ @Override public int getHighestBlock(HeightMap.Type heightmap_type, int i, int j) { // Paper
return ((HeightMap) this.heightMap.get(heightmap_type)).a(i & 15, j & 15) - 1;
}
diff --git a/src/main/java/net/minecraft/server/ChunkSection.java b/src/main/java/net/minecraft/server/ChunkSection.java
index 90bb2f7ad9f82818d58de9be918f1299c6725070..668942c629732b8d46b7f2646df8e7827baae240 100644
--- a/src/main/java/net/minecraft/server/ChunkSection.java
+++ b/src/main/java/net/minecraft/server/ChunkSection.java
@@ -7,12 +7,14 @@ import javax.annotation.Nullable;
public class ChunkSection {
public static final DataPalette<IBlockData> GLOBAL_PALETTE = new DataPaletteGlobal<>(Block.REGISTRY_ID, Blocks.AIR.getBlockData());
- private final int yPos;
+ final int yPos; // Paper - private -> package-private
short nonEmptyBlockCount; // Paper - package-private
- private short tickingBlockCount;
+ short tickingBlockCount; // Paper - private -> package-private
private short e;
final DataPaletteBlock<IBlockData> blockIds; // Paper - package-private
+ final com.destroystokyo.paper.util.maplist.IBlockDataList tickingList = new com.destroystokyo.paper.util.maplist.IBlockDataList(); // Paper
+
// Paper start - Anti-Xray - Add parameters
@Deprecated public ChunkSection(int i) { this(i, null, null, true); } // Notice for updates: Please make sure this constructor isn't used anywhere
public ChunkSection(int i, IChunkAccess chunk, World world, boolean initializeBlocks) {
@@ -67,6 +69,9 @@ public class ChunkSection {
--this.nonEmptyBlockCount;
if (iblockdata1.isTicking()) {
--this.tickingBlockCount;
+ // Paper start
+ this.tickingList.remove(i, j, k);
+ // Paper end
}
}
@@ -78,6 +83,9 @@ public class ChunkSection {
++this.nonEmptyBlockCount;
if (iblockdata.isTicking()) {
++this.tickingBlockCount;
+ // Paper start
+ this.tickingList.add(i, j, k, iblockdata);
+ // Paper end
}
}
@@ -113,23 +121,29 @@ public class ChunkSection {
}
public void recalcBlockCounts() {
+ // Paper start
+ this.tickingList.clear();
+ // Paper end
this.nonEmptyBlockCount = 0;
this.tickingBlockCount = 0;
this.e = 0;
- this.blockIds.a((iblockdata, i) -> {
+ this.blockIds.forEachLocation((iblockdata, location) -> { // Paper
Fluid fluid = iblockdata.getFluid();
if (!iblockdata.isAir()) {
- this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + i);
+ this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + 1);
if (iblockdata.isTicking()) {
- this.tickingBlockCount = (short) (this.tickingBlockCount + i);
+ this.tickingBlockCount = (short) (this.tickingBlockCount + 1);
+ // Paper start
+ this.tickingList.add(location, iblockdata);
+ // Paper end
}
}
if (!fluid.isEmpty()) {
- this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + i);
+ this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + 1);
if (fluid.f()) {
- this.e = (short) (this.e + i);
+ this.e = (short) (this.e + 1);
}
}
diff --git a/src/main/java/net/minecraft/server/DataBits.java b/src/main/java/net/minecraft/server/DataBits.java
index 2901700dc0ff5dce4fb6f6df9f6686c786293d28..26b48b5ffa4ce3fbe50810dc1a8070d333a2684f 100644
--- a/src/main/java/net/minecraft/server/DataBits.java
+++ b/src/main/java/net/minecraft/server/DataBits.java
@@ -111,4 +111,32 @@ public class DataBits {
}
}
+
+ // Paper start
+ public final void forEach(DataBitConsumer consumer) {
+ int i = 0;
+ long[] along = this.b;
+ int j = along.length;
+
+ for (int k = 0; k < j; ++k) {
+ long l = along[k];
+
+ for (int i1 = 0; i1 < this.f; ++i1) {
+ consumer.accept(i, (int) (l & this.d));
+ l >>= this.c;
+ ++i;
+ if (i >= this.e) {
+ return;
+ }
+ }
+ }
+ }
+
+ @FunctionalInterface
+ static interface DataBitConsumer {
+
+ void accept(int location, int data);
+
+ }
+ // Paper end
}
diff --git a/src/main/java/net/minecraft/server/DataPaletteBlock.java b/src/main/java/net/minecraft/server/DataPaletteBlock.java
index ed77117630d54b7ad81f633110c7d2a7c59288e9..95ef96286855624590b72d69514b0fc0e08fddba 100644
--- a/src/main/java/net/minecraft/server/DataPaletteBlock.java
+++ b/src/main/java/net/minecraft/server/DataPaletteBlock.java
@@ -277,6 +277,14 @@ public class DataPaletteBlock<T> implements DataPaletteExpandable<T> {
});
}
+ // Paper start
+ public void forEachLocation(DataPaletteBlock.a<T> datapaletteblock_a) {
+ this.getDataBits().forEach((int location, int data) -> {
+ datapaletteblock_a.accept(this.getDataPalette().getObject(data), location);
+ });
+ }
+ // Paper end
+
@FunctionalInterface
public interface a<T> {
diff --git a/src/main/java/net/minecraft/server/EntityTurtle.java b/src/main/java/net/minecraft/server/EntityTurtle.java
index 1fd2a41050de39b47a0fe6e52f7a6727a8475757..430f9d23a24f6d28af91719f8ca81ad1f83d00d0 100644
--- a/src/main/java/net/minecraft/server/EntityTurtle.java
+++ b/src/main/java/net/minecraft/server/EntityTurtle.java
@@ -28,7 +28,7 @@ public class EntityTurtle extends EntityAnimal {
}
public void setHomePos(BlockPosition blockposition) {
- this.datawatcher.set(EntityTurtle.bp, blockposition);
+ this.datawatcher.set(EntityTurtle.bp, blockposition.immutableCopy()); // Paper - called with mutablepos...
}
public BlockPosition getHomePos() { // Paper - public
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 31f27db84e15664bb5aa81da73916e65bbffb62f..c3f524a3b1ce20d61e3f6b5a0897cf6bb9b2460c 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1417,10 +1417,18 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
public abstract ITagRegistry p();
public BlockPosition a(int i, int j, int k, int l) {
+ // Paper start - allow use of mutable pos
+ BlockPosition.MutableBlockPosition ret = new BlockPosition.MutableBlockPosition();
+ this.getRandomBlockPosition(i, j, k, l, ret);
+ return ret.immutableCopy();
+ }
+ public final BlockPosition.MutableBlockPosition getRandomBlockPosition(int i, int j, int k, int l, BlockPosition.MutableBlockPosition out) {
+ // Paper end
this.n = this.n * 3 + 1013904223;
int i1 = this.n >> 2;
- return new BlockPosition(i + (i1 & 15), j + (i1 >> 16 & l), k + (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 isSavingDisabled() {
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index 026818ce2c69ffe0399cb1aa5391fa896720c36b..65e47279dcaba633bfbad324be04285422f809e9 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -557,7 +557,12 @@ public class WorldServer extends World implements GeneratorAccessSeed {
});
}
- public void a(Chunk chunk, int i) {
+ // Paper start - optimise random block ticking
+ private final BlockPosition.MutableBlockPosition chunkTickMutablePosition = new BlockPosition.MutableBlockPosition();
+ private final com.destroystokyo.paper.util.math.ThreadUnsafeRandom randomTickRandom = new com.destroystokyo.paper.util.math.ThreadUnsafeRandom();
+ // Paper end
+
+ public void a(Chunk chunk, int i) { final int randomTickSpeed = i; // Paper
ChunkCoordIntPair chunkcoordintpair = chunk.getPos();
boolean flag = this.isRaining();
int j = chunkcoordintpair.d();
@@ -565,10 +570,10 @@ public class WorldServer extends World implements GeneratorAccessSeed {
GameProfilerFiller gameprofilerfiller = this.getMethodProfiler();
gameprofilerfiller.enter("thunder");
- BlockPosition blockposition;
+ final BlockPosition.MutableBlockPosition blockposition = this.chunkTickMutablePosition; // Paper - use mutable to reduce allocation rate, final to force compile fail on change
if (!this.paperConfig.disableThunder && flag && this.V() && this.random.nextInt(100000) == 0) { // Paper - Disable thunder
- blockposition = this.a(this.a(j, 0, k, 15));
+ blockposition.setValues(this.a(this.a(j, 0, k, 15))); // Paper
if (this.isRainingAt(blockposition)) {
DifficultyDamageScaler difficultydamagescaler = this.getDamageScaler(blockposition);
boolean flag1 = this.getGameRules().getBoolean(GameRules.DO_MOB_SPAWNING) && this.random.nextDouble() < (double) difficultydamagescaler.b() * paperConfig.skeleHorseSpawnChance; // Paper
@@ -591,59 +596,77 @@ public class WorldServer extends World implements GeneratorAccessSeed {
}
gameprofilerfiller.exitEnter("iceandsnow");
- if (!this.paperConfig.disableIceAndSnow && this.random.nextInt(16) == 0) { // Paper - Disable ice and snow
- blockposition = this.getHighestBlockYAt(HeightMap.Type.MOTION_BLOCKING, this.a(j, 0, k, 15));
- BlockPosition blockposition1 = blockposition.down();
+ 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.Type.MOTION_BLOCKING, blockposition.getX() & 15, blockposition.getZ() & 15);
+ int downY = normalY - 1;
+ blockposition.setY(normalY);
+ // Paper end
BiomeBase biomebase = this.getBiome(blockposition);
- if (biomebase.a(this, blockposition1)) {
- org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this, blockposition1, Blocks.ICE.getBlockData(), null); // CraftBukkit
+ // Paper start - optimise chunk ticking
+ blockposition.setY(downY);
+ if (biomebase.a(this, blockposition)) {
+ org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this, blockposition, Blocks.ICE.getBlockData(), null); // CraftBukkit
+ // Paper end
}
+ blockposition.setY(normalY); // Paper
if (flag && biomebase.b(this, blockposition)) {
org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this, blockposition, Blocks.SNOW.getBlockData(), null); // CraftBukkit
}
- if (flag && this.getBiome(blockposition1).c() == BiomeBase.Precipitation.RAIN) {
- this.getType(blockposition1).getBlock().c((World) this, blockposition1);
+ // Paper start - optimise chunk ticking
+ blockposition.setY(downY);
+ if (flag && this.getBiome(blockposition).c() == BiomeBase.Precipitation.RAIN) {
+ chunk.getType(blockposition).getBlock().c((World) this, blockposition);
+ // Paper end
}
}
- gameprofilerfiller.exitEnter("tickBlocks");
- timings.chunkTicksBlocks.startTiming(); // Paper
+ // Paper start - optimise random block ticking
+ gameprofilerfiller.exit();
if (i > 0) {
- ChunkSection[] achunksection = chunk.getSections();
- int l = achunksection.length;
+ gameprofilerfiller.enter("randomTick");
+ timings.chunkTicksBlocks.startTiming(); // Paper
- for (int i1 = 0; i1 < l; ++i1) {
- ChunkSection chunksection = achunksection[i1];
+ ChunkSection[] sections = chunk.getSections();
- if (chunksection != Chunk.a && chunksection.d()) {
- int j1 = chunksection.getYPosition();
+ for (int sectionIndex = 0; sectionIndex < 16; ++sectionIndex) {
+ ChunkSection section = sections[sectionIndex];
+ if (section == null || section.tickingList.size() == 0) {
+ continue;
+ }
- for (int k1 = 0; k1 < i; ++k1) {
- BlockPosition blockposition2 = this.a(j, j1, k, 15);
+ int yPos = sectionIndex << 4;
- gameprofilerfiller.enter("randomTick");
- IBlockData iblockdata = chunksection.getType(blockposition2.getX() - j, blockposition2.getY() - j1, blockposition2.getZ() - k);
+ for (int a = 0; a < randomTickSpeed; ++a) {
+ int tickingBlocks = section.tickingList.size();
+ int index = this.randomTickRandom.nextInt(16 * 16 * 16);
+ if (index >= tickingBlocks) {
+ continue;
+ }
- if (iblockdata.isTicking()) {
- iblockdata.b(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;
- Fluid fluid = iblockdata.getFluid();
+ BlockPosition blockposition2 = blockposition.setValues(j + randomX, randomY, k + randomZ);
+ IBlockData iblockdata = com.destroystokyo.paper.util.maplist.IBlockDataList.getBlockDataFromRaw(raw);
- if (fluid.f()) {
- fluid.b(this, blockposition2, this.random);
- }
+ iblockdata.b(this, blockposition2, this.randomTickRandom);
- gameprofilerfiller.exit();
- }
+ // We drop the fluid tick since LAVA is ALREADY TICKED by the above method.
+ // TODO CHECK ON UPDATE
}
}
+ gameprofilerfiller.exit();
+ timings.chunkTicksBlocks.stopTiming(); // Paper
+ // Paper end
}
- timings.chunkTicksBlocks.stopTiming(); // Paper
- gameprofilerfiller.exit();
}
protected BlockPosition a(BlockPosition blockposition) {
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