From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar Date: Thu, 9 Apr 2020 00:09:26 -0400 Subject: [PATCH] Mid Tick Chunk Tasks - Speed up processing of chunk loads and generation Credit to Spotted for the idea A lot of the new chunk system requires constant back and forth the main thread to handle priority scheduling and ensuring conflicting tasks do not run at the same time. The issue is, these queues are only checked at either: A) Sync Chunk Loads B) End of Tick while sleeping This results in generating chunks sitting waiting for a full tick to complete before it will even start the next unit of work to do. Additionally, this also delays loading of chunks until this same timing. We will now periodically poll the chunk task queues throughout the tick, looking for work to do. We do this in a fair method that considers all worlds, not just the one being ticked, so that each world can get 1 task procesed each before the next pass. In a view distance of 15, chunk loading performance was visually faster on the client. Flying at high speed in spectator mode was able to keep up with chunk loading (as long as they are already generated) diff --git a/src/main/java/co/aikar/timings/MinecraftTimings.java b/src/main/java/co/aikar/timings/MinecraftTimings.java index a58ef60d9976b3afc50e94364cf474bd2e5fdfd6..dd07223978c9aa648673d96ba7b3db1160d43bbf 100644 --- a/src/main/java/co/aikar/timings/MinecraftTimings.java +++ b/src/main/java/co/aikar/timings/MinecraftTimings.java @@ -13,6 +13,7 @@ import java.util.Map; public final class MinecraftTimings { public static final Timing serverOversleep = Timings.ofSafe("Server Oversleep"); + public static final Timing midTickChunkTasks = Timings.ofSafe("Mid Tick Chunk Tasks"); public static final Timing playerListTimer = Timings.ofSafe("Player List"); public static final Timing commandFunctionsTimer = Timings.ofSafe("Command Functions"); public static final Timing connectionTimer = Timings.ofSafe("Connection Handler"); diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java index ee1a690c1b12f28a5282a61917d28deb3ca08f61..7b37f46b29699603629e5e635be89f725f163f00 100644 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java @@ -405,4 +405,9 @@ public class PaperConfig { log("Async Chunks: Enabled - Chunks will be loaded much faster, without lag."); } } + + public static int midTickChunkTasks = 1000; + private static void midTickChunkTasks() { + midTickChunkTasks = getInt("settings.chunk-tasks-per-tick", midTickChunkTasks); + } } diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java index 359ac0845468e0bcccf7ed4d5596cad5f72dafa8..fb061dc0d6be52c959e8360e25a2c7c0468f40e2 100644 --- a/src/main/java/net/minecraft/server/ChunkProviderServer.java +++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java @@ -695,6 +695,7 @@ public class ChunkProviderServer extends IChunkProvider { this.world.getMethodProfiler().enter("purge"); this.world.timings.doChunkMap.startTiming(); // Spigot this.chunkMapDistance.purgeTickets(); + this.world.getMinecraftServer().midTickLoadChunks(); // Paper this.tickDistanceManager(); this.world.timings.doChunkMap.stopTiming(); // Spigot this.world.getMethodProfiler().exitEnter("chunks"); @@ -704,6 +705,7 @@ public class ChunkProviderServer extends IChunkProvider { this.world.timings.doChunkUnload.startTiming(); // Spigot this.world.getMethodProfiler().exitEnter("unload"); this.playerChunkMap.unloadChunks(booleansupplier); + this.world.getMinecraftServer().midTickLoadChunks(); // Paper this.world.timings.doChunkUnload.stopTiming(); // Spigot this.world.getMethodProfiler().exit(); this.clearCache(); @@ -757,7 +759,7 @@ public class ChunkProviderServer extends IChunkProvider { entityPlayer.playerNaturallySpawnedEvent.callEvent(); }; // Paper end - this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping + final int[] chunksTicked = {0}; this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping Optional optional = ((Either) playerchunk.a().getNow(PlayerChunk.UNLOADED_CHUNK)).left(); if (optional.isPresent()) { @@ -781,6 +783,7 @@ public class ChunkProviderServer extends IChunkProvider { this.world.timings.chunkTicks.startTiming(); // Spigot // Paper this.world.a(chunk, k); this.world.timings.chunkTicks.stopTiming(); // Spigot // Paper + if (chunksTicked[0]++ % 10 == 0) this.world.getMinecraftServer().midTickLoadChunks(); // Paper } } } @@ -937,6 +940,41 @@ public class ChunkProviderServer extends IChunkProvider { super.executeTask(runnable); } + // Paper start + private long lastMidTickChunkTask = 0; + public boolean pollChunkLoadTasks() { + if (com.destroystokyo.paper.io.chunk.ChunkTaskManager.pollChunkWaitQueue() || ChunkProviderServer.this.world.asyncChunkTaskManager.pollNextChunkTask()) { + try { + ChunkProviderServer.this.tickDistanceManager(); + } finally { + // from below: process pending Chunk loadCallback() and unloadCallback() after each run task + playerChunkMap.callbackExecutor.run(); + } + return true; + } + return false; + } + public void midTickLoadChunks() { + MinecraftServer server = ChunkProviderServer.this.world.getMinecraftServer(); + // always try to load chunks, restrain generation/other updates only. don't count these towards tick count + //noinspection StatementWithEmptyBody + while (pollChunkLoadTasks()) {} + + if (System.nanoTime() - lastMidTickChunkTask < 200000) { + return; + } + + for (;server.midTickChunksTasksRan < com.destroystokyo.paper.PaperConfig.midTickChunkTasks && server.canSleepForTick();) { + if (this.executeNext()) { + server.midTickChunksTasksRan++; + lastMidTickChunkTask = System.nanoTime(); + } else { + break; + } + } + } + // Paper end + @Override protected boolean executeNext() { // CraftBukkit start - process pending Chunk loadCallback() and unloadCallback() after each run task diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java index 3c87b0c5a55caf589aabd508255e704368797d65..9ee7e5a1fd499dfdb804a78e41ddaf3e43dc1920 100644 --- a/src/main/java/net/minecraft/server/MinecraftServer.java +++ b/src/main/java/net/minecraft/server/MinecraftServer.java @@ -939,6 +939,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant { + midTickLoadChunks(); // will only do loads since we are still considered !canSleepForTick return !this.canOversleep(); }); isOversleep = false;MinecraftTimings.serverOversleep.stopTiming(); @@ -1202,13 +1221,16 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant