From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar Date: Wed, 6 May 2020 23:30:30 -0400 Subject: [PATCH] Optimize NibbleArray to use pooled buffers Massively reduces memory allocation of 2048 byte buffers by using an object pool for these. Uses lots of advanced new capabilities of the Paper codebase :) diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java index 937bd0daf84f6b5f382dea73e20f2fd6ad903000..3d06c87b64c209526bee2ea11b58d30fe9b1d062 100644 --- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java +++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java @@ -386,11 +386,11 @@ public class ChunkRegionLoader { } if (nibblearray != null && !nibblearray.c()) { - nbttagcompound2.setByteArray("BlockLight", nibblearray.asBytes()); + nbttagcompound2.setByteArray("BlockLight", nibblearray.asBytesPoolSafe().clone()); // Paper } if (nibblearray1 != null && !nibblearray1.c()) { - nbttagcompound2.setByteArray("SkyLight", nibblearray1.asBytes()); + nbttagcompound2.setByteArray("SkyLight", nibblearray1.asBytesPoolSafe().clone()); // Paper } nbttaglist.add(nbttagcompound2); diff --git a/src/main/java/net/minecraft/server/LightEngineStorage.java b/src/main/java/net/minecraft/server/LightEngineStorage.java index 6c7c4e75670a7e08ba10c0231a2510bf985dab6b..b8b06c790adfa0246b1a6fb5eab1f63bf5ef8b0b 100644 --- a/src/main/java/net/minecraft/server/LightEngineStorage.java +++ b/src/main/java/net/minecraft/server/LightEngineStorage.java @@ -149,7 +149,7 @@ public abstract class LightEngineStorage> e protected NibbleArray j(long i) { NibbleArray nibblearray = (NibbleArray) this.i.get(i); - return nibblearray != null ? nibblearray : new NibbleArray(); + return nibblearray != null ? nibblearray : new NibbleArray().markPoolSafe(); // Paper } protected void a(LightEngineLayer lightenginelayer, long i) { @@ -331,12 +331,12 @@ public abstract class LightEngineStorage> e protected void a(long i, @Nullable NibbleArray nibblearray, boolean flag) { if (nibblearray != null) { - this.i.put(i, nibblearray); + NibbleArray remove = this.i.put(i, nibblearray); if (remove != null && remove.cleaner != null) remove.cleaner.run(); // Paper - clean up when removed if (!flag) { this.n.add(i); } } else { - this.i.remove(i); + NibbleArray remove = this.i.remove(i); if (remove != null && remove.cleaner != null) remove.cleaner.run(); // Paper - clean up when removed } } diff --git a/src/main/java/net/minecraft/server/LightEngineStorageArray.java b/src/main/java/net/minecraft/server/LightEngineStorageArray.java index 53199595da71a25710bd1ff8ee2868ee63edc0e1..37c44a89f28c44915fcae5a7e2c4797b1c123723 100644 --- a/src/main/java/net/minecraft/server/LightEngineStorageArray.java +++ b/src/main/java/net/minecraft/server/LightEngineStorageArray.java @@ -33,7 +33,9 @@ public abstract class LightEngineStorageArray BYTE_2048 = new PooledObjects<>(() -> new byte[2048], maxPoolSize); + public static void releaseBytes(byte[] bytes) { + if (bytes != null && bytes != EMPTY_NIBBLE && bytes.length == 2048) { + System.arraycopy(EMPTY_NIBBLE, 0, bytes, 0, 2048); + BYTE_2048.release(bytes); + } + } + + public NibbleArray markPoolSafe(byte[] bytes) { + if (bytes != EMPTY_NIBBLE) this.a = bytes; + return markPoolSafe(); + } + public NibbleArray markPoolSafe() { + poolSafe = true; + return this; + } + public byte[] getIfSet() { + return this.a != null ? this.a : EMPTY_NIBBLE; + } + public byte[] getCloneIfSet() { + if (a == null) { + return EMPTY_NIBBLE; + } + byte[] ret = BYTE_2048.acquire(); + System.arraycopy(getIfSet(), 0, ret, 0, 2048); + return ret; + } + + public NibbleArray cloneAndSet(byte[] bytes) { + if (bytes != null && bytes != EMPTY_NIBBLE) { + this.a = BYTE_2048.acquire(); + System.arraycopy(bytes, 0, this.a, 0, 2048); + } + return this; + } + boolean poolSafe = false; + public java.lang.Runnable cleaner; + private void registerCleaner() { + if (!poolSafe) { + cleaner = MCUtil.registerCleaner(this, this.a, NibbleArray::releaseBytes); + } else { + cleaner = MCUtil.once(() -> NibbleArray.releaseBytes(this.a)); + } + } + // Paper end + @Nullable protected byte[] a; + public NibbleArray() {} public NibbleArray(byte[] abyte) { + // Paper start + this(abyte, false); + } + public NibbleArray(byte[] abyte, boolean isSafe) { this.a = abyte; + if (!isSafe) this.a = getCloneIfSet(); // Paper - clone for safety + registerCleaner(); + // Paper end if (abyte.length != 2048) { throw (IllegalArgumentException) SystemUtils.c((Throwable) (new IllegalArgumentException("ChunkNibbleArrays should be 2048 bytes not: " + abyte.length))); } @@ -44,7 +103,8 @@ public class NibbleArray { public void a(int i, int j) { // PAIL: private -> public if (this.a == null) { - this.a = new byte[2048]; + this.a = BYTE_2048.acquire(); // Paper + registerCleaner();// Paper } int k = this.d(i); @@ -66,14 +126,36 @@ public class NibbleArray { public byte[] asBytes() { if (this.a == null) { this.a = new byte[2048]; + } else { // Paper start + // Accessor may need this object past garbage collection so need to clone it and return pooled value + // If we know its safe for pre GC access, use asBytesPoolSafe(). If you just need read, use getIfSet() + Runnable cleaner = this.cleaner; + if (cleaner != null) { + this.a = this.a.clone(); + cleaner.run(); // release the previously pooled value + this.cleaner = null; + } + } + // Paper end + + return this.a; + } + + @Nonnull + public byte[] asBytesPoolSafe() { + if (this.a == null) { + this.a = BYTE_2048.acquire(); // Paper + registerCleaner(); // Paper } + //noinspection ConstantConditions return this.a; } + // Paper end public NibbleArray copy() { return this.b(); } // Paper - OBFHELPER public NibbleArray b() { - return this.a == null ? new NibbleArray() : new NibbleArray((byte[]) this.a.clone()); + return this.a == null ? new NibbleArray() : new NibbleArray(this.a); // Paper - clone in ctor } public String toString() { diff --git a/src/main/java/net/minecraft/server/NibbleArrayFlat.java b/src/main/java/net/minecraft/server/NibbleArrayFlat.java index 67c960292db9d99ac85b5d0dda50ae48ef942c1b..5e3efa1fa6c089df35971ce5c83da384f7dbd402 100644 --- a/src/main/java/net/minecraft/server/NibbleArrayFlat.java +++ b/src/main/java/net/minecraft/server/NibbleArrayFlat.java @@ -8,7 +8,7 @@ public class NibbleArrayFlat extends NibbleArray { public NibbleArrayFlat(NibbleArray nibblearray, int i) { super(128); - System.arraycopy(nibblearray.asBytes(), i * 128, this.a, 0, 128); + System.arraycopy(nibblearray.getIfSet(), i * 128, this.a, 0, 128); // Paper } @Override @@ -18,7 +18,7 @@ public class NibbleArrayFlat extends NibbleArray { @Override public byte[] asBytes() { - byte[] abyte = new byte[2048]; + byte[] abyte = BYTE_2048.acquire(); // Paper for (int i = 0; i < 16; ++i) { System.arraycopy(this.a, 0, abyte, i * 128, 128); diff --git a/src/main/java/net/minecraft/server/PacketPlayOutLightUpdate.java b/src/main/java/net/minecraft/server/PacketPlayOutLightUpdate.java index 6b70df646c6a690ab9437ead96c5ff097e4e12d2..a22f0cccecc85b4e4fe4603bcfa213f15c23db69 100644 --- a/src/main/java/net/minecraft/server/PacketPlayOutLightUpdate.java +++ b/src/main/java/net/minecraft/server/PacketPlayOutLightUpdate.java @@ -1,6 +1,8 @@ package net.minecraft.server; import com.google.common.collect.Lists; +import io.netty.channel.ChannelFuture; // Paper + import java.io.IOException; import java.util.Iterator; import java.util.List; @@ -17,14 +19,43 @@ public class PacketPlayOutLightUpdate implements Packet { private List h; private boolean i; + // Paper start + java.lang.Runnable cleaner1; + java.lang.Runnable cleaner2; + java.util.concurrent.atomic.AtomicInteger remainingSends = new java.util.concurrent.atomic.AtomicInteger(0); + + @Override + public void onPacketDispatch(EntityPlayer player) { + remainingSends.incrementAndGet(); + } + + @Override + public void onPacketDispatchFinish(EntityPlayer player, ChannelFuture future) { + if (remainingSends.decrementAndGet() <= 0) { + // incase of any race conditions, schedule this delayed + MCUtil.scheduleTask(5, () -> { + if (remainingSends.get() == 0) { + cleaner1.run(); + cleaner2.run(); + } + }, "Light Packet Release"); + } + } + + @Override + public boolean hasFinishListener() { + return true; + } + + // Paper end public PacketPlayOutLightUpdate() {} public PacketPlayOutLightUpdate(ChunkCoordIntPair chunkcoordintpair, LightEngine lightengine, boolean flag) { this.a = chunkcoordintpair.x; this.b = chunkcoordintpair.z; this.i = flag; - this.g = Lists.newArrayList(); - this.h = Lists.newArrayList(); + this.g = Lists.newArrayList();cleaner1 = MCUtil.registerListCleaner(this, this.g, NibbleArray::releaseBytes); // Paper + this.h = Lists.newArrayList();cleaner2 = MCUtil.registerListCleaner(this, this.h, NibbleArray::releaseBytes); // Paper for (int i = 0; i < 18; ++i) { NibbleArray nibblearray = lightengine.a(EnumSkyBlock.SKY).a(SectionPosition.a(chunkcoordintpair, -1 + i)); @@ -35,7 +66,7 @@ public class PacketPlayOutLightUpdate implements Packet { this.e |= 1 << i; } else { this.c |= 1 << i; - this.g.add(nibblearray.asBytes().clone()); + this.g.add(nibblearray.getCloneIfSet()); // Paper } } @@ -44,7 +75,7 @@ public class PacketPlayOutLightUpdate implements Packet { this.f |= 1 << i; } else { this.d |= 1 << i; - this.h.add(nibblearray1.asBytes().clone()); + this.h.add(nibblearray1.getCloneIfSet()); // Paper } } } @@ -57,8 +88,8 @@ public class PacketPlayOutLightUpdate implements Packet { this.i = flag; this.c = i; this.d = j; - this.g = Lists.newArrayList(); - this.h = Lists.newArrayList(); + this.g = Lists.newArrayList();cleaner1 = MCUtil.registerListCleaner(this, this.g, NibbleArray::releaseBytes); // Paper + this.h = Lists.newArrayList();cleaner2 = MCUtil.registerListCleaner(this, this.h, NibbleArray::releaseBytes); // Paper for (int k = 0; k < 18; ++k) { NibbleArray nibblearray; @@ -66,7 +97,7 @@ public class PacketPlayOutLightUpdate implements Packet { if ((this.c & 1 << k) != 0) { nibblearray = lightengine.a(EnumSkyBlock.SKY).a(SectionPosition.a(chunkcoordintpair, -1 + k)); if (nibblearray != null && !nibblearray.c()) { - this.g.add(nibblearray.asBytes().clone()); + this.g.add(nibblearray.getCloneIfSet()); // Paper } else { this.c &= ~(1 << k); if (nibblearray != null) { @@ -78,7 +109,7 @@ public class PacketPlayOutLightUpdate implements Packet { if ((this.d & 1 << k) != 0) { nibblearray = lightengine.a(EnumSkyBlock.BLOCK).a(SectionPosition.a(chunkcoordintpair, -1 + k)); if (nibblearray != null && !nibblearray.c()) { - this.h.add(nibblearray.asBytes().clone()); + this.h.add(nibblearray.getCloneIfSet()); // Paper } else { this.d &= ~(1 << k); if (nibblearray != null) { diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java index 2a08a3170fcef666cb3096511d8a592e575c9734..d2c45157a27c24651c72fd8ab9a0950dec097b84 100644 --- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java +++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java @@ -274,14 +274,14 @@ public class CraftChunk implements Chunk { sectionSkyLights[i] = emptyLight; } else { sectionSkyLights[i] = new byte[2048]; - System.arraycopy(skyLightArray.asBytes(), 0, sectionSkyLights[i], 0, 2048); + System.arraycopy(skyLightArray.getIfSet(), 0, sectionSkyLights[i], 0, 2048); // Paper } NibbleArray emitLightArray = lightengine.a(EnumSkyBlock.BLOCK).a(SectionPosition.a(x, i, z)); if (emitLightArray == null) { sectionEmitLights[i] = emptyLight; } else { sectionEmitLights[i] = new byte[2048]; - System.arraycopy(emitLightArray.asBytes(), 0, sectionEmitLights[i], 0, 2048); + System.arraycopy(emitLightArray.getIfSet(), 0, sectionEmitLights[i], 0, 2048); // Paper } } }