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Paper/Spigot-Server-Patches/0436-Optimise-random-block-ticking.patch

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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/Block.java b/src/main/java/net/minecraft/server/Block.java
index e29ec958b3519d92cda215a50e97e6852d71c684..e40375b67a4a321048c87002a07fde5c5d2395db 100644
--- a/src/main/java/net/minecraft/server/Block.java
+++ b/src/main/java/net/minecraft/server/Block.java
@@ -109,8 +109,8 @@ public class Block implements IMaterial {
return iblockdata.d(iblockaccess, blockposition, EnumDirection.UP) && this.n < 14;
}
- @Deprecated
- public boolean d(IBlockData iblockdata) {
+ public final boolean isAir(IBlockData iblockdata) { return this.d(iblockdata); } // Paper - OBFHELPER
+ @Deprecated public boolean d(IBlockData iblockdata) { // Paper - OBFHELPER
return false;
}
diff --git a/src/main/java/net/minecraft/server/BlockFluids.java b/src/main/java/net/minecraft/server/BlockFluids.java
index 6d351f0979ecfa8e500edf8dd03b4a455fd5d180..a44f65f40d2080b63069602a454266ee6fe6cff7 100644
--- a/src/main/java/net/minecraft/server/BlockFluids.java
+++ b/src/main/java/net/minecraft/server/BlockFluids.java
@@ -27,7 +27,7 @@ public class BlockFluids extends Block implements IFluidSource {
@Override
public void b(IBlockData iblockdata, WorldServer worldserver, BlockPosition blockposition, Random random) {
- worldserver.getFluid(blockposition).b(worldserver, blockposition, random);
+ iblockdata.getFluid().b(worldserver, blockposition, random); // Paper - avoid getType call
}
@Override
diff --git a/src/main/java/net/minecraft/server/BlockPosition.java b/src/main/java/net/minecraft/server/BlockPosition.java
index db7ba12fd4fa4f30b94471f1efbec5426b99a5db..9010359fbdc393e43ab2a0702cfc27427458b1ff 100644
--- a/src/main/java/net/minecraft/server/BlockPosition.java
+++ b/src/main/java/net/minecraft/server/BlockPosition.java
@@ -451,6 +451,7 @@ public class BlockPosition extends BaseBlockPosition implements MinecraftSeriali
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 a2a0ca3394c3231aad9888fecebdaf82d4d9e9f7..bb95fe20e8aee58cf20fa764000b9f9123f367d3 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -586,8 +586,8 @@ public class Chunk implements IChunkAccess {
this.entities.remove(entity); // Paper
}
- @Override
- public int a(HeightMap.Type heightmap_type, int i, int j) {
+ public int getHighestBlockY(HeightMap.Type heightmap_type, int i, int j) { return this.a(heightmap_type, i, j) + 1; } // Paper - sort of an obfhelper, but without -1
+ @Override public int a(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 eeb7eee925d31d1ed8e6bbd55888cb5ebe54afa2..64b625e988f6bb6dc7129b4cb70e266015ab0867 100644
--- a/src/main/java/net/minecraft/server/ChunkSection.java
+++ b/src/main/java/net/minecraft/server/ChunkSection.java
@@ -6,12 +6,14 @@ 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
private short nonEmptyBlockCount;
- private short tickingBlockCount;
+ short tickingBlockCount; // Paper - private -> package-private
private short e;
final DataPaletteBlock<IBlockData> blockIds;
+ 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) {
@@ -66,6 +68,9 @@ public class ChunkSection {
--this.nonEmptyBlockCount;
if (iblockdata1.q()) {
--this.tickingBlockCount;
+ // Paper start
+ this.tickingList.remove(i, j, k);
+ // Paper end
}
}
@@ -77,6 +82,9 @@ public class ChunkSection {
++this.nonEmptyBlockCount;
if (iblockdata.q()) {
++this.tickingBlockCount;
+ // Paper start
+ this.tickingList.add(i, j, k, iblockdata);
+ // Paper end
}
}
@@ -112,23 +120,29 @@ 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); // Paper
if (iblockdata.q()) {
- this.tickingBlockCount = (short) (this.tickingBlockCount + i);
+ this.tickingBlockCount = (short) (this.tickingBlockCount + 1); // Paper
+ // Paper start
+ this.tickingList.add(location, iblockdata);
+ // Paper end
}
}
if (!fluid.isEmpty()) {
- this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + i);
+ this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + 1); // Paper
if (fluid.h()) {
- this.e = (short) (this.e + i);
+ this.e = (short) (this.e + 1); // Paper
}
}
diff --git a/src/main/java/net/minecraft/server/DataBits.java b/src/main/java/net/minecraft/server/DataBits.java
index f9680b6830c77f31e1eb8b6845dd6d58d04f624a..a61cffa3f494be5fea785a573b0faf05b149a30d 100644
--- a/src/main/java/net/minecraft/server/DataBits.java
+++ b/src/main/java/net/minecraft/server/DataBits.java
@@ -127,4 +127,46 @@ public class DataBits {
}
}
+
+ // Paper start
+ public final void forEach(DataBitConsumer consumer) {
+ // Note: copied from above
+ int i = this.a.length;
+
+ if (i != 0) {
+ int j = 0;
+ long k = this.a[0];
+ long l = i > 1 ? this.a[1] : 0L;
+
+ for (int i1 = 0; i1 < this.d; ++i1) {
+ int j1 = i1 * this.b;
+ int k1 = j1 >> 6;
+ int l1 = (i1 + 1) * this.b - 1 >> 6;
+ int i2 = j1 ^ k1 << 6;
+
+ if (k1 != j) {
+ k = l;
+ l = k1 + 1 < i ? this.a[k1 + 1] : 0L;
+ j = k1;
+ }
+
+ if (k1 == l1) {
+ consumer.accept(i1, (int) (k >>> i2 & this.c));
+ } else {
+ int j2 = 64 - i2;
+
+ consumer.accept(i1, (int) ((k >>> i2 | l << j2) & this.c));
+ }
+ }
+
+ }
+ }
+
+ @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 2c7872bd0516c820a42682b5281dbbaa1b467beb..be5f98c3c368cb046112dc488344bb529fc395c1 100644
--- a/src/main/java/net/minecraft/server/DataPaletteBlock.java
+++ b/src/main/java/net/minecraft/server/DataPaletteBlock.java
@@ -281,6 +281,14 @@ 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 dd02cb3485021c3afd23c2985a71e93c6b0ab07d..b24a5100b452f69f771b724ca96d34613c7fa170 100644
--- a/src/main/java/net/minecraft/server/EntityTurtle.java
+++ b/src/main/java/net/minecraft/server/EntityTurtle.java
@@ -29,7 +29,7 @@ public class EntityTurtle extends EntityAnimal {
public final void setHome(BlockPosition pos) { g(pos); } // Paper - OBFHELPER
public void g(BlockPosition blockposition) {
- this.datawatcher.set(EntityTurtle.bx, blockposition);
+ this.datawatcher.set(EntityTurtle.bx, blockposition.immutableCopy()); // Paper - make sure home position can't change
}
public final BlockPosition getHome() { return this.es(); } // Paper - OBFHELPER
diff --git a/src/main/java/net/minecraft/server/IBlockData.java b/src/main/java/net/minecraft/server/IBlockData.java
index de43881653ff37e38dc42c7f953dc96126a30c61..e821c236b45993cf4fb670cafbc979ead7d207a1 100644
--- a/src/main/java/net/minecraft/server/IBlockData.java
+++ b/src/main/java/net/minecraft/server/IBlockData.java
@@ -22,11 +22,15 @@ public class IBlockData extends BlockDataAbstract<Block, IBlockData> implements
private IBlockData.a c;
private final int d;
private final boolean e;
+ private final boolean isAir; // Paper
+ private final boolean isTicking; // Paper
public IBlockData(Block block, ImmutableMap<IBlockState<?>, Comparable<?>> immutablemap) {
super(block, immutablemap);
this.d = block.a(this);
this.e = block.o(this);
+ this.isAir = this.getBlock().isAir(this); // Paper
+ this.isTicking = this.getBlock().isTicking(this); // Paper
}
public void c() {
@@ -81,8 +85,8 @@ public class IBlockData extends BlockDataAbstract<Block, IBlockData> implements
return this.d;
}
- public boolean isAir() {
- return this.getBlock().d(this);
+ public final boolean isAir() { // Paper - compile fail if the impl changes
+ return this.isAir; // Paper - improve inlining of isAir
}
public MaterialMapColor c(IBlockAccess iblockaccess, BlockPosition blockposition) {
@@ -267,12 +271,19 @@ public class IBlockData extends BlockDataAbstract<Block, IBlockData> implements
return this.getBlock().a(tag);
}
+ private Fluid fluidData; // Paper - cache result
public Fluid getFluid() {
- return this.getBlock().a_(this);
+ // Paper start
+ // This can't be done during the constructor, order issues
+ if (this.fluidData != null) {
+ return this.fluidData;
+ }
+ return this.fluidData = this.getBlock().a_(this);
+ // Paper end
}
public boolean q() {
- return this.getBlock().isTicking(this);
+ return this.isTicking; // Paper
}
public final SoundEffectType getStepSound() { return this.r(); } // Paper - OBFHELPER
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 0c23fc89d7ad980aa8b094784e88e2d91fb4f07b..de9f49b884838105c537b73d69234eb26fddb708 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1563,10 +1563,19 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
public abstract TagRegistry t();
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.i = this.i * 3 + 1013904223;
int i1 = this.i >> 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 c348e3e5008e9213f96f2eb718cfb07c340bf77b..fcbc9f29139ce5cd3b165130006f9c326a5d9eea 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -531,7 +531,12 @@ public class WorldServer extends World {
});
}
- 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();
@@ -539,10 +544,10 @@ public class WorldServer extends World {
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.U() && this.random.nextInt(100000) == 0) { // Paper - Disable thunder
- blockposition = this.a(this.a(j, 0, k, 15));
+ if (!this.paperConfig.disableThunder && flag && this.U() && this.randomTickRandom.nextInt(100000) == 0) { // Paper - Disable thunder // Paper - optimise random ticking
+ blockposition.setValues(this.a(this.getRandomBlockPosition(j, 0, k, 15, blockposition))); // 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
@@ -561,61 +566,79 @@ public class WorldServer extends World {
}
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((IWorldReader) 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((IWorldReader) 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).d() == BiomeBase.Precipitation.RAIN) {
- this.getType(blockposition1).getBlock().c((World) this, blockposition1);
+ // Paper start - optimise chunk ticking
+ blockposition.setY(downY);
+ if (flag && this.getBiome(blockposition).d() == 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.q()) {
- iblockdata.getBlock().randomTick = true; // Paper - fix MC-113809
- iblockdata.b(this, blockposition2, this.random);
- iblockdata.getBlock().randomTick = false; // Paper - fix MC-113809
- }
+ 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.h()) {
- fluid.b(this, blockposition2, this.random);
- }
+ iblockdata.getBlock().randomTick = true; // Paper - fix MC-113809
+ iblockdata.b(this, blockposition2, this.randomTickRandom);
+ iblockdata.getBlock().randomTick = false; // Paper - fix MC-113809
- 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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