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 25ffcafd27b0119301faf81817e3072cd6fd8de6..f1ae9c3b3db3a7540650365b1c8a9b8274b25644 100644 --- a/src/main/java/net/minecraft/server/level/ServerLevel.java +++ b/src/main/java/net/minecraft/server/level/ServerLevel.java @@ -845,6 +845,10 @@ 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(); @@ -854,10 +858,10 @@ 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 @@ -888,16 +892,25 @@ public class ServerLevel extends Level implements WorldGenLevel { int i1; 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) { l = this.getGameRules().getInt(GameRules.RULE_SNOW_ACCUMULATION_HEIGHT); + + blockposition.setY(normalY); // Paper if (l > 0 && biomebase.shouldSnow(this, blockposition)) { BlockState iblockdata = this.getBlockState(blockposition); @@ -913,51 +926,54 @@ public class ServerLevel extends Level implements WorldGenLevel { org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this, blockposition, Blocks.SNOW.defaultBlockState(), null); // CraftBukkit } } + blockposition.setY(downY); // Paper - Biome.Precipitation biomebase_precipitation = biomebase.getPrecipitationAt(blockposition1); + Biome.Precipitation biomebase_precipitation = biomebase.getPrecipitationAt(blockposition); // Paper if (biomebase_precipitation != Biome.Precipitation.NONE) { - BlockState iblockdata2 = this.getBlockState(blockposition1); + BlockState iblockdata2 = this.getBlockState(blockposition); // Paper - iblockdata2.getBlock().handlePrecipitation(iblockdata2, this, blockposition1, biomebase_precipitation); + iblockdata2.getBlock().handlePrecipitation(iblockdata2, 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(); - - for (int j1 = 0; j1 < achunksection.length; ++j1) { - LevelChunkSection chunksection = achunksection[j1]; - - if (chunksection.isRandomlyTicking()) { - l = chunk.getSectionYFromSectionIndex(j1); - int k1 = SectionPos.sectionToBlockCoord(l); - - for (i1 = 0; i1 < randomTickSpeed; ++i1) { - BlockPos blockposition2 = this.getBlockRandomPos(j, k1, k, 15); - - gameprofilerfiller.push("randomTick"); - BlockState iblockdata3 = chunksection.getBlockState(blockposition2.getX() - j, blockposition2.getY() - k1, 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 (iblockdata3.isRandomlyTicking()) { - iblockdata3.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 = iblockdata3.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 68648c5a5e3ff079f832092af0f2f801c42d1ede..8bafd5fd7499ba4a04bf706cfd1e156073716e21 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[] out); 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 2b3fd62dca2d1475075b5dcde56cea85b749cb44..e4d0d7e8fc58b8f9f614d74a141e452166e0364c 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 f0f764f36fb92c64ab2dc8a0a50c3f48321c3c9a..311625277a26c9c187025a1036978229241b965f 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 99fc97051c61ac8d08afdc0ea4845e96705e243b..c48bf4ca76f70d878378fc43c8270de5c3332824 100644 --- a/src/main/java/net/minecraft/world/entity/animal/Turtle.java +++ b/src/main/java/net/minecraft/world/entity/animal/Turtle.java @@ -84,7 +84,7 @@ 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 2ed14a26084150fc67b031a7ab6b76fd8f0b075a..4847b6358e823bd53ecfaf7d82ed9e36d45b1233 100644 --- a/src/main/java/net/minecraft/world/level/Level.java +++ b/src/main/java/net/minecraft/world/level/Level.java @@ -1293,10 +1293,18 @@ 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 789664d53584c7d958572c63db22f904fb411a58..5d53b09e19b664fad337ea5098bf9cf41a7168f8 100644 --- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java +++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java @@ -25,6 +25,7 @@ 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(PalettedContainer datapaletteblock, PalettedContainer> palettedcontainerro) { // CraftBukkit end @@ -74,6 +75,9 @@ public class LevelChunkSection { --this.nonEmptyBlockCount; if (iblockdata1.isRandomlyTicking()) { --this.tickingBlockCount; + // Paper start + this.tickingList.remove(x, y, z); + // Paper end } } @@ -85,6 +89,9 @@ public class LevelChunkSection { ++this.nonEmptyBlockCount; if (state.isRandomlyTicking()) { ++this.tickingBlockCount; + // Paper start + this.tickingList.add(x, y, z, state); + // Paper end } } @@ -112,40 +119,31 @@ 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 a8dc502fffdce89c44ec16cb158b04c30fb1a9cf..f4658eea741bed1c80f8aca7dc365b897b698cd4 100644 --- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java +++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java @@ -315,6 +315,14 @@ 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);