From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Spottedleaf 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..7d93652c1abbb6aee6eb7c26cf35d4d032ef7b69 --- /dev/null +++ b/src/main/java/io/papermc/paper/util/math/ThreadUnsafeRandom.java @@ -0,0 +1,65 @@ +package io.papermc.paper.util.math; + +import net.minecraft.util.RandomSource; +import net.minecraft.world.level.levelgen.LegacyRandomSource; +import net.minecraft.world.level.levelgen.PositionalRandomFactory; +import org.checkerframework.checker.nullness.qual.NonNull; +import org.checkerframework.framework.qual.DefaultQualifier; + +@DefaultQualifier(NonNull.class) +public final class ThreadUnsafeRandom extends LegacyRandomSource { + + // 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; + + public ThreadUnsafeRandom(long seed) { + super(seed); + } + + @Override + public RandomSource fork() { + return new ThreadUnsafeRandom(this.nextLong()); + } + + @Override + public PositionalRandomFactory forkPositional() { + throw new UnsupportedOperationException(); + } + + @Override + public void setSeed(long seed) { + // note: called by Random constructor + this.seed = initialScramble(seed); + } + + @Override + public 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 3ba995c8d21427a3dbbde22c8faa0a7888507880..02e58f7de47af48c9e23dfd2ebe5fab9967dd82c 100644 --- a/src/main/java/net/minecraft/server/level/ServerLevel.java +++ b/src/main/java/net/minecraft/server/level/ServerLevel.java @@ -707,6 +707,10 @@ 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(this.random.nextLong()); + // Paper end public void tickChunk(LevelChunk chunk, int randomTickSpeed) { ChunkPos chunkcoordintpair = chunk.getPos(); @@ -716,10 +720,10 @@ 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().environment.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() * this.paperConfig().entities.spawning.skeletonHorseThunderSpawnChance.or(0.01D) && !this.getBlockState(blockposition.below()).is(Blocks.LIGHTNING_ROD); // Paper @@ -749,18 +753,26 @@ public class ServerLevel extends Level implements WorldGenLevel { int l; if (!this.paperConfig().environment.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(); + // 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 = (Biome) this.getBiome(blockposition).value(); - if (biomebase.shouldFreeze(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) { int i1 = this.getGameRules().getInt(GameRules.RULE_SNOW_ACCUMULATION_HEIGHT); BlockState iblockdata; + blockposition.setY(normalY); // Paper if (i1 > 0 && biomebase.shouldSnow(this, blockposition)) { iblockdata = this.getBlockState(blockposition); if (iblockdata.is(Blocks.SNOW)) { @@ -775,52 +787,55 @@ public class ServerLevel extends Level implements WorldGenLevel { org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this, blockposition, Blocks.SNOW.defaultBlockState(), null); // CraftBukkit } } + blockposition.setY(downY); // Paper - iblockdata = this.getBlockState(blockposition1); + iblockdata = this.getBlockState(blockposition); // Paper Biome.Precipitation biomebase_precipitation = biomebase.getPrecipitation(); - if (biomebase_precipitation == Biome.Precipitation.RAIN && biomebase.coldEnoughToSnow(blockposition1)) { + if (biomebase_precipitation == Biome.Precipitation.RAIN && biomebase.coldEnoughToSnow(blockposition)) { // Paper biomebase_precipitation = Biome.Precipitation.SNOW; } - iblockdata.getBlock().handlePrecipitation(iblockdata, this, blockposition1, biomebase_precipitation); + iblockdata.getBlock().handlePrecipitation(iblockdata, 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 j1 = achunksection.length; - - for (int k1 = 0; k1 < j1; ++k1) { - LevelChunkSection chunksection = achunksection[k1]; - - if (chunksection.isRandomlyTicking()) { - int l1 = chunksection.bottomBlockY(); - - for (l = 0; l < randomTickSpeed; ++l) { - BlockPos blockposition2 = this.getBlockRandomPos(j, l1, k, 15); - - gameprofilerfiller.push("randomTick"); - BlockState iblockdata2 = chunksection.getBlockState(blockposition2.getX() - j, blockposition2.getY() - l1, 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 (iblockdata2.isRandomlyTicking()) { - iblockdata2.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 = iblockdata2.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 (ping the Canadian) } } } - + // 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 62251727788d48a461ea6f7945771d7d6bdc7282..106610ccc74b70b557b01c61262d56c4f1147acf 100644 --- a/src/main/java/net/minecraft/util/BitStorage.java +++ b/src/main/java/net/minecraft/util/BitStorage.java @@ -20,4 +20,15 @@ public interface BitStorage { void unpack(int[] is); BitStorage copy(); + + // Paper start + void forEach(DataBitConsumer consumer); + + @FunctionalInterface + interface DataBitConsumer { + + void accept(int location, int data); + + } + // Paper end } diff --git a/src/main/java/net/minecraft/util/SimpleBitStorage.java b/src/main/java/net/minecraft/util/SimpleBitStorage.java index 9b81ce9d85cba07e9752c29fb5a842c4b00aa873..36e33923bf48e56c743ed043bcbc66bc32f0422f 100644 --- a/src/main/java/net/minecraft/util/SimpleBitStorage.java +++ b/src/main/java/net/minecraft/util/SimpleBitStorage.java @@ -124,6 +124,28 @@ public class SimpleBitStorage implements BitStorage { return this.bits; } + // Paper start + @Override + 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; + } + } + } + } + // Paper end + @Override public void getAll(IntConsumer action) { int i = 0; diff --git a/src/main/java/net/minecraft/util/ZeroBitStorage.java b/src/main/java/net/minecraft/util/ZeroBitStorage.java index 9686ce7536c9924b1b2aced4f013f46759cbc72e..5d8e9bdf5538b19681f21949368d862fab8a89ad 100644 --- a/src/main/java/net/minecraft/util/ZeroBitStorage.java +++ b/src/main/java/net/minecraft/util/ZeroBitStorage.java @@ -46,6 +46,15 @@ public class ZeroBitStorage implements BitStorage { return 0; } + // Paper start + @Override + public void forEach(DataBitConsumer consumer) { + for(int i = 0; i < this.size; ++i) { + consumer.accept(i, 0); + } + } + // Paper end + @Override public void getAll(IntConsumer action) { for(int i = 0; i < this.size; ++i) { 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 30663713e198bfe40b95c48524b71ea65f39965e..25503678e7d049a8b3172cfad8a5606958c32302 100644 --- a/src/main/java/net/minecraft/world/entity/animal/Turtle.java +++ b/src/main/java/net/minecraft/world/entity/animal/Turtle.java @@ -83,7 +83,7 @@ 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() { diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java index c56de0c388f5902d85b0810c6e105c24d721bcdd..62bf7fec8188e69e7811aa4e1f0f3131f8af0bd7 100644 --- a/src/main/java/net/minecraft/world/level/Level.java +++ b/src/main/java/net/minecraft/world/level/Level.java @@ -1368,10 +1368,18 @@ public abstract class Level implements LevelAccessor, AutoCloseable { public abstract RecipeManager getRecipeManager(); 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 066874d27495dcaa3dea254b7328257e46920357..c3f1334b2bb97f0633f3ea43b97ee49adfd8bc0d 100644 --- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java +++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java @@ -27,6 +27,7 @@ public class LevelChunkSection { public final PalettedContainer states; // CraftBukkit start - read/write private PalettedContainer> biomes; + public final com.destroystokyo.paper.util.maplist.IBlockDataList tickingList = new com.destroystokyo.paper.util.maplist.IBlockDataList(); // Paper public LevelChunkSection(int i, PalettedContainer datapaletteblock, PalettedContainer> palettedcontainerro) { // CraftBukkit end @@ -85,6 +86,9 @@ public class LevelChunkSection { --this.nonEmptyBlockCount; if (iblockdata1.isRandomlyTicking()) { --this.tickingBlockCount; + // Paper start + this.tickingList.remove(x, y, z); + // Paper end } } @@ -96,6 +100,9 @@ public class LevelChunkSection { ++this.nonEmptyBlockCount; if (state.isRandomlyTicking()) { ++this.tickingBlockCount; + // Paper start + this.tickingList.add(x, y, z, state); + // Paper end } } @@ -127,40 +134,31 @@ public class LevelChunkSection { } public void recalcBlockCounts() { - class a implements PalettedContainer.CountConsumer { - - public int nonEmptyBlockCount; - public int tickingBlockCount; - public int tickingFluidCount; - - a() {} - - public void accept(BlockState iblockdata, int i) { - FluidState fluid = iblockdata.getFluidState(); - - if (!iblockdata.isAir()) { - this.nonEmptyBlockCount += i; - if (iblockdata.isRandomlyTicking()) { - this.tickingBlockCount += i; - } + // Paper start - unfuck this + this.tickingList.clear(); + this.nonEmptyBlockCount = 0; + this.tickingBlockCount = 0; + this.tickingFluidCount = 0; + this.states.forEachLocation((BlockState iblockdata, int i) -> { + FluidState fluid = iblockdata.getFluidState(); + + if (!iblockdata.isAir()) { + this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + 1); + if (iblockdata.isRandomlyTicking()) { + this.tickingBlockCount = (short)(this.tickingBlockCount + 1); + this.tickingList.add(i, iblockdata); } + } - if (!fluid.isEmpty()) { - this.nonEmptyBlockCount += i; - if (fluid.isRandomlyTicking()) { - this.tickingFluidCount += i; - } + if (!fluid.isEmpty()) { + this.nonEmptyBlockCount = (short) (this.nonEmptyBlockCount + 1); + if (fluid.isRandomlyTicking()) { + this.tickingFluidCount = (short) (this.tickingFluidCount + 1); } - } - } - a a0 = new a(); - - this.states.count(a0); - this.nonEmptyBlockCount = (short) a0.nonEmptyBlockCount; - this.tickingBlockCount = (short) a0.tickingBlockCount; - this.tickingFluidCount = (short) a0.tickingFluidCount; + }); + // Paper end } public PalettedContainer getStates() { 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 5cd4b81a9e89402c617aa3458200b95faa551c9c..2362688501d246f4a1ced41d63f75548a19ad013 100644 --- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java +++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java @@ -383,6 +383,14 @@ public class PalettedContainer implements PaletteResize, PalettedContainer } } + // Paper start + public void forEachLocation(PalettedContainer.CountConsumer consumer) { + this.data.storage.forEach((int location, int data) -> { + consumer.accept(this.data.palette.valueFor(data), location); + }); + } + // Paper end + @FunctionalInterface public interface CountConsumer { void accept(T object, int count);