228 lines
12 KiB
Diff
228 lines
12 KiB
Diff
From a7827fe0ade0d2345c605f97c29de347ae9b9068 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Thu, 9 Apr 2020 00:09:26 -0400
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Subject: [PATCH] Speed up processing of chunk loads and generation
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Credit to Spotted for the idea
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A lot of the new chunk system requires constant back and forth the main thread
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to handle priority scheduling and ensuring conflicting tasks do not run at the
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same time.
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The issue is, these queues are only checked at either:
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A) Sync Chunk Loads
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B) End of Tick while sleeping
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This results in generating chunks sitting waiting for a full tick to
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complete before it will even start the next unit of work to do.
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Additionally, this also delays loading of chunks until this same timing.
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We will now periodically poll the chunk task queues throughout the tick,
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looking for work to do.
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We do this in a fair method that considers all worlds, not just the one being
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ticked, so that each world can get 1 task procesed each before the next pass.
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We also cap the throughput of these task processes to 1 per world per 0.1ms or
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200 max per tick, to ensure that high volume of tasks do not overload the current
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tick time.
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In a view distance of 15, chunk loading performance was visually faster on the client.
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Flying at high speed in spectator mode was able to keep up with chunk loading (as long as they are already generated)
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diff --git a/src/main/java/co/aikar/timings/MinecraftTimings.java b/src/main/java/co/aikar/timings/MinecraftTimings.java
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index 69e26a8267..434833d50e 100644
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--- a/src/main/java/co/aikar/timings/MinecraftTimings.java
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+++ b/src/main/java/co/aikar/timings/MinecraftTimings.java
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@@ -13,6 +13,7 @@ import java.util.Map;
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public final class MinecraftTimings {
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public static final Timing serverOversleep = Timings.ofSafe("Server Oversleep");
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+ public static final Timing midTickChunkTasks = Timings.ofSafe("Mid Tick Chunk Tasks");
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public static final Timing playerListTimer = Timings.ofSafe("Player List");
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public static final Timing commandFunctionsTimer = Timings.ofSafe("Command Functions");
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public static final Timing connectionTimer = Timings.ofSafe("Connection Handler");
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diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
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index e627440c41..bacfc4cba6 100644
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--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
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+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
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@@ -602,6 +602,7 @@ public class ChunkProviderServer extends IChunkProvider {
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this.world.getMethodProfiler().enter("purge");
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this.world.timings.doChunkMap.startTiming(); // Spigot
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this.chunkMapDistance.purgeTickets();
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+ this.world.getMinecraftServer().midTickLoadChunks(); // Paper
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this.tickDistanceManager();
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this.world.timings.doChunkMap.stopTiming(); // Spigot
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this.world.getMethodProfiler().exitEnter("chunks");
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@@ -611,6 +612,7 @@ public class ChunkProviderServer extends IChunkProvider {
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this.world.timings.doChunkUnload.startTiming(); // Spigot
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this.world.getMethodProfiler().exitEnter("unload");
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this.playerChunkMap.unloadChunks(booleansupplier);
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+ this.world.getMinecraftServer().midTickLoadChunks(); // Paper
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this.world.timings.doChunkUnload.stopTiming(); // Spigot
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this.world.getMethodProfiler().exit();
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this.clearCache();
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@@ -669,7 +671,7 @@ public class ChunkProviderServer extends IChunkProvider {
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entityPlayer.playerNaturallySpawnedEvent.callEvent();
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};
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// Paper end
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- this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping
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+ final int[] chunksTicked = {0}; this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping
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Optional<Chunk> optional = ((Either) playerchunk.b().getNow(PlayerChunk.UNLOADED_CHUNK)).left();
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if (optional.isPresent()) {
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@@ -752,6 +754,7 @@ public class ChunkProviderServer extends IChunkProvider {
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this.world.timings.chunkTicks.startTiming(); // Spigot // Paper
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this.world.a(chunk, k);
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this.world.timings.chunkTicks.stopTiming(); // Spigot // Paper
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+ if (chunksTicked[0]++ % 10 == 0) this.world.getMinecraftServer().midTickLoadChunks(); // Paper
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}
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}
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});
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@@ -893,6 +896,38 @@ public class ChunkProviderServer extends IChunkProvider {
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super.executeTask(runnable);
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}
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+ // Paper start
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+ private long lastChunkTask = 0;
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+ public void midTickLoadChunks() {
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+ MinecraftServer server = ChunkProviderServer.this.world.getMinecraftServer();
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+ try (co.aikar.timings.Timing ignored = co.aikar.timings.MinecraftTimings.midTickChunkTasks.startTiming()) {
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+ while (server.canSleepForTick()) {
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+ try {
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+ // always try to load chunks as long as we aren't falling behind, restrain generation/other updates only.
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+ boolean execChunkTask = com.destroystokyo.paper.io.chunk.ChunkTaskManager.pollChunkWaitQueue() || ChunkProviderServer.this.world.asyncChunkTaskManager.pollNextChunkTask(); // Paper
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+ if (ChunkProviderServer.this.tickDistanceManager() || execChunkTask) {
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+ continue;
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+ }
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+ long now = System.nanoTime();
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+ // cap to 1 task every 0.1ms per world and max 200 tasks per tick.
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+ // Anything that doesn't make it past this can load during sleep
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+ // we do not want to use this.executeNext as that also processes chunk loads and might count against task counter.
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+ // We also have already ticked the distance manager above too.
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+ if (server.chunksTasksRan < 200 && now - lastChunkTask > 100000 && super.executeNext()) {
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+ ChunkProviderServer.this.lightEngine.queueUpdate();
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+ server.chunksTasksRan++;
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+ lastChunkTask = now;
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+ }
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+ break;
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+ } finally {
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+ // from below: process pending Chunk loadCallback() and unloadCallback() after each run task
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+ playerChunkMap.callbackExecutor.run();
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+ }
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+ }
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+ }
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+ }
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+ // Paper end
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+
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@Override
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protected boolean executeNext() {
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// CraftBukkit start - process pending Chunk loadCallback() and unloadCallback() after each run task
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index 06c395000f..936434110c 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -919,6 +919,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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// Paper end
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tickSection = curTime;
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}
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+ chunksTasksRan = 0; // Paper
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// Spigot end
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//MinecraftServer.currentTick = (int) (System.currentTimeMillis() / 50); // CraftBukkit // Paper - don't overwrite current tick time
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@@ -989,7 +990,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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}
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- private boolean canSleepForTick() {
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+ public boolean canSleepForTick() { // Paper
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// CraftBukkit start
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return this.forceTicks || this.isEntered() || SystemUtils.getMonotonicMillis() < (this.ac ? this.ab : this.nextTick);
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}
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@@ -1017,6 +1018,20 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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});
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}
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+ // Paper start
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+ public int chunksTasksRan = 0;
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+ public void midTickLoadChunks() {
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+ if (!this.canSleepForTick()) {
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+ return;
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+ }
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+
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+ Iterator<WorldServer> iterator = this.getWorlds().iterator();
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+ while (this.canSleepForTick() && iterator.hasNext()) {
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+ iterator.next().getChunkProvider().serverThreadQueue.midTickLoadChunks();
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+ }
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+ }
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+ // Paper end
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+
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@Override
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protected TickTask postToMainThread(Runnable runnable) {
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return new TickTask(this.ticks, runnable);
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diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
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index e61ddeb1ff..92c9ab43d7 100644
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--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
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+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
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@@ -793,7 +793,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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CompletableFuture<Either<IChunkAccess, PlayerChunk.Failure>> ret = new CompletableFuture<>();
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Consumer<ChunkRegionLoader.InProgressChunkHolder> chunkHolderConsumer = (ChunkRegionLoader.InProgressChunkHolder holder) -> {
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- PlayerChunkMap.this.executor.addTask(() -> {
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+ com.destroystokyo.paper.io.chunk.ChunkTaskManager.queueChunkWaitTask(() -> {
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ret.complete(syncLoadComplete.apply(holder, null));
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});
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};
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diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
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index c7ec8cbc11..43573287f2 100644
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--- a/src/main/java/net/minecraft/server/WorldServer.java
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+++ b/src/main/java/net/minecraft/server/WorldServer.java
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@@ -420,6 +420,7 @@ public class WorldServer extends World {
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}
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timings.scheduledBlocks.stopTiming(); // Spigot
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+ this.getMinecraftServer().midTickLoadChunks(); // Paper
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gameprofilerfiller.exitEnter("raid");
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this.timings.raids.startTiming(); // Paper - timings
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this.persistentRaid.a();
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@@ -432,6 +433,7 @@ public class WorldServer extends World {
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timings.doSounds.startTiming(); // Spigot
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this.ad();
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timings.doSounds.stopTiming(); // Spigot
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+ this.getMinecraftServer().midTickLoadChunks(); // Paper
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this.ticking = false;
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gameprofilerfiller.exitEnter("entities");
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boolean flag3 = true || !this.players.isEmpty() || !this.getForceLoadedChunks().isEmpty(); // CraftBukkit - this prevents entity cleanup, other issues on servers with no players
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@@ -470,7 +472,9 @@ public class WorldServer extends World {
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org.spigotmc.ActivationRange.activateEntities(this); // Spigot
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timings.entityTick.startTiming(); // Spigot
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TimingHistory.entityTicks += this.globalEntityList.size(); // Paper
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+ int entitiesTicked = 0; // Paper
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while (objectiterator.hasNext()) {
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+ if (entitiesTicked++ % 100 == 0) this.getMinecraftServer().midTickLoadChunks(); // Paper
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Entry<Entity> entry = (Entry) objectiterator.next();
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Entity entity1 = (Entity) entry.getValue();
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Entity entity2 = entity1.getVehicle();
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@@ -517,6 +521,7 @@ public class WorldServer extends World {
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timings.entityTick.stopTiming(); // Spigot
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this.tickingEntities = false;
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+ this.getMinecraftServer().midTickLoadChunks(); // Paper
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try (co.aikar.timings.Timing ignored = this.timings.newEntities.startTiming()) { // Paper - timings
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while ((entity = (Entity) this.entitiesToAdd.poll()) != null) {
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@@ -527,7 +532,9 @@ public class WorldServer extends World {
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gameprofilerfiller.exit();
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timings.tickEntities.stopTiming(); // Spigot
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+ this.getMinecraftServer().midTickLoadChunks(); // Paper
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this.tickBlockEntities();
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+ this.getMinecraftServer().midTickLoadChunks(); // Paper
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}
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gameprofilerfiller.exit();
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--
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2.25.1
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