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e56bbcdcda
Paper/Spigot-Server-Patches/0031-Lighting-Queue.patch
Aikar e56bbcdcda Refactor Lighting Queue System 
may help #284

Cleans up the lighting queue system, reducing diff and improving implementation.

We no longer stop chunk unloads due to lighting updates, and instead simply flush the lighting queue.
The cost of forcing the chunk (and its neighbors!) to stay loaded waiting for its
lighting work to finish is much greater than simply taking the hit and doing the work.

This change also helps reduce the diff and avoid bugs with missed diffs by removing
duplicated logic.

Also switches to a more effecient data structure (ArrayDeque instead of LinkedList) for the queue itself.
2016-05-15 18:48:39 -04:00

240 Zeilen
9.7 KiB
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Originalformat Blame Verlauf

From dda988688e1cc0e88e958f3d2efb47a23df5cc01 Mon Sep 17 00:00:00 2001
From: Byteflux <byte@byteflux.net>
Date: Wed, 2 Mar 2016 00:52:31 -0600
Subject: [PATCH] Lighting Queue
This provides option to queue lighting updates to ensure they do not cause the server lag
diff --git a/src/main/java/co/aikar/timings/WorldTimingsHandler.java b/src/main/java/co/aikar/timings/WorldTimingsHandler.java
index 11dd692..da3787d 100644
--- a/src/main/java/co/aikar/timings/WorldTimingsHandler.java
+++ b/src/main/java/co/aikar/timings/WorldTimingsHandler.java
@@ -35,6 +35,8 @@ public class WorldTimingsHandler {
public final Timing syncChunkLoadTileTicksTimer;
public final Timing syncChunkLoadPostTimer;
+ public final Timing lightingQueueTimer;
+
public WorldTimingsHandler(World server) {
String name = server.worldData.getName() +" - ";
@@ -67,5 +69,7 @@ public class WorldTimingsHandler {
tracker2 = Timings.ofSafe(name + "tracker stage 2");
doTick = Timings.ofSafe(name + "doTick");
tickEntities = Timings.ofSafe(name + "tickEntities");
+
+ lightingQueueTimer = Timings.ofSafe(name + "Lighting Queue");
}
}
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 7c0e61f..8e3a0f3 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -155,4 +155,10 @@ public class PaperWorldConfig {
netherVoidTopDamage = getBoolean( "nether-ceiling-void-damage", false );
log("Top of the nether void damage: " + netherVoidTopDamage);
}
+
+ public boolean queueLightUpdates;
+ private void queueLightUpdates() {
+ queueLightUpdates = getBoolean("queue-light-updates", false);
+ log("Lighting Queue enabled: " + queueLightUpdates);
+ }
}
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 5690e81..d55beb9 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -33,6 +33,7 @@ public class Chunk {
private boolean m;
public final Map<BlockPosition, TileEntity> tileEntities;
public final List<Entity>[] entitySlices; // Spigot
+ final PaperLightingQueue.LightingQueue lightingQueue = new PaperLightingQueue.LightingQueue(this); // Paper
private boolean done;
private boolean lit;
private boolean r;
@@ -227,6 +228,13 @@ public class Chunk {
private void h(boolean flag) {
this.world.methodProfiler.a("recheckGaps");
if (this.world.areChunksLoaded(new BlockPosition(this.locX * 16 + 8, 0, this.locZ * 16 + 8), 16)) {
+ lightingQueue.add(() -> recheckGaps(flag)); // Paper - Queue light update
+ }
+ }
+
+ private void recheckGaps(boolean flag) {
+ if (true) {
+ // Paper end
for (int i = 0; i < 16; ++i) {
for (int j = 0; j < 16; ++j) {
if (this.i[i + j * 16]) {
@@ -478,7 +486,7 @@ public class Chunk {
} else {
if (flag) {
this.initLighting();
- } else {
+ } else { lightingQueue.add(() -> { // Paper - Queue light update
int j1 = iblockdata.c();
int k1 = iblockdata1.c();
@@ -493,6 +501,7 @@ public class Chunk {
if (j1 != k1 && (j1 < k1 || this.getBrightness(EnumSkyBlock.SKY, blockposition) > 0 || this.getBrightness(EnumSkyBlock.BLOCK, blockposition) > 0)) {
this.d(i, k);
}
+ }); // Paper
}
TileEntity tileentity;
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index de85bd5..50f0345 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -275,6 +275,7 @@ public class ChunkProviderServer implements IChunkProvider {
if (event.isCancelled()) {
continue;
}
+ chunk.lightingQueue.processUnload(); // Paper
// Update neighbor counts
for (int x = -2; x < 3; x++) {
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index ebf6c48..89a40a8 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -706,7 +706,7 @@ public abstract class MinecraftServer implements Runnable, ICommandListener, IAs
protected void C() throws ExceptionWorldConflict { // CraftBukkit - added throws
co.aikar.timings.TimingsManager.FULL_SERVER_TICK.startTiming(); // Paper
- long i = System.nanoTime();
+ long i = System.nanoTime(); long startTime = i; // Paper
++this.ticks;
if (this.S) {
@@ -766,6 +766,7 @@ public abstract class MinecraftServer implements Runnable, ICommandListener, IAs
this.methodProfiler.b();
org.spigotmc.WatchdogThread.tick(); // Spigot
+ PaperLightingQueue.processQueue(startTime); // Paper
co.aikar.timings.TimingsManager.FULL_SERVER_TICK.stopTiming(); // Paper
}
diff --git a/src/main/java/net/minecraft/server/PaperLightingQueue.java b/src/main/java/net/minecraft/server/PaperLightingQueue.java
new file mode 100644
index 0000000..2350fe3
--- /dev/null
+++ b/src/main/java/net/minecraft/server/PaperLightingQueue.java
@@ -0,0 +1,98 @@
+package net.minecraft.server;
+
+import co.aikar.timings.Timing;
+import java.util.ArrayDeque;
+
+class PaperLightingQueue {
+ private static final long MAX_TIME = (long) (1000000000 / 20 * .95);
+ private static int updatesThisTick;
+
+
+ static void processQueue(long curTime) {
+ updatesThisTick = 0;
+
+ final long startTime = System.nanoTime();
+ final long maxTickTime = MAX_TIME - (startTime - curTime);
+
+ START:
+ for (World world : MinecraftServer.getServer().worlds) {
+ if (!world.paperConfig.queueLightUpdates) {
+ continue;
+ }
+
+ for (Chunk chunk : ((WorldServer) world).getChunkProviderServer().chunks.values()) {
+ if (chunk.lightingQueue.processQueue(startTime, maxTickTime)) {
+ break START;
+ }
+ }
+ }
+ }
+
+ static class LightingQueue extends ArrayDeque<Runnable> {
+ final private Chunk chunk;
+
+ LightingQueue(Chunk chunk) {
+ super();
+ this.chunk = chunk;
+ }
+
+ @Override
+ public boolean add(Runnable runnable) {
+ if (chunk.world.paperConfig.queueLightUpdates) {
+ return super.add(runnable);
+ }
+ runnable.run();
+ return true;
+ }
+
+ /**
+ * Processes the lighting queue for this chunk
+ *
+ * @param startTime If start Time is 0, we will not limit execution time
+ * @param maxTickTime Maximum time to spend processing lighting updates
+ * @return true to abort processing furthur lighting updates
+ */
+ private boolean processQueue(long startTime, long maxTickTime) {
+ if (this.isEmpty()) {
+ return false;
+ }
+ try (Timing ignored = chunk.world.timings.lightingQueueTimer.startTiming()) {
+ Runnable lightUpdate;
+ while ((lightUpdate = this.poll()) != null) {
+ lightUpdate.run();
+ if (startTime > 0 && ++PaperLightingQueue.updatesThisTick % 10 == 0 && PaperLightingQueue.updatesThisTick > 10) {
+ if (System.nanoTime() - startTime > maxTickTime) {
+ return true;
+ }
+ }
+ }
+ }
+
+ return false;
+ }
+
+ /**
+ * Flushes lighting updates to unload the chunk
+ */
+ void processUnload() {
+ if (!chunk.world.paperConfig.queueLightUpdates) {
+ return;
+ }
+ processQueue(0, 0); // No timeout
+
+ final int radius = 1; // TODO: bitflip, why should this ever be 2?
+ for (int x = chunk.locX - radius; x <= chunk.locX + radius; ++x) {
+ for (int z = chunk.locZ - radius; z <= chunk.locZ + radius; ++z) {
+ if (x == chunk.locX && z == chunk.locZ) {
+ continue;
+ }
+
+ Chunk neighbor = MCUtil.getLoadedChunkWithoutMarkingActive(chunk.world, x, z);
+ if (neighbor != null) {
+ neighbor.lightingQueue.processQueue(0, 0); // No timeout
+ }
+ }
+ }
+ }
+ }
+}
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 362df8f..dc51a79 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -384,7 +384,7 @@ public abstract class World implements IBlockAccess {
} else {
if (iblockdata.c() != iblockdata1.c() || iblockdata.d() != iblockdata1.d()) {
this.methodProfiler.a("checkLight");
- this.w(blockposition);
+ chunk.lightingQueue.add(() -> this.w(blockposition)); // Paper - Queue light update
this.methodProfiler.b();
}
--
2.8.2
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