From 29c2fec0e51219fb6b6cf9ef100c18f6f4ca3d4b Mon Sep 17 00:00:00 2001 From: Aikar Date: Sat, 11 Apr 2020 03:56:07 -0400 Subject: [PATCH] Implement Chunk Priority / Urgency System for World Gen Mark chunks that are blocking main thread for world generation as urgent Implements a general priority system so that chunks that are sorted in the generator queues can prioritize certain chunks over another. Urgent chunks will jump to the front of the line, ensuring that a sync chunk load on an ungenerated chunk does not lag the server for a long period of time if the servers generator queues are filled with lots of chunks already. This massively reduces the lag spikes from sync chunk gens. diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java index 747305619b..746b5b5589 100644 --- a/src/main/java/net/minecraft/server/ChunkProviderServer.java +++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java @@ -308,6 +308,7 @@ public class ChunkProviderServer extends IChunkProvider { } private long asyncLoadSeqCounter; + public static boolean IS_CHUNK_LOAD_BLOCKING_MAIN = false; public void getChunkAtAsynchronously(int x, int z, boolean gen, java.util.function.Consumer onComplete) { if (Thread.currentThread() != this.serverThread) { @@ -465,10 +466,18 @@ public class ChunkProviderServer extends IChunkProvider { } gameprofilerfiller.c("getChunkCacheMiss"); + // Paper start - Chunk Load/Gen Priority + boolean prevBlocking = IS_CHUNK_LOAD_BLOCKING_MAIN; + IS_CHUNK_LOAD_BLOCKING_MAIN = true; + // Paper end CompletableFuture> completablefuture = this.getChunkFutureMainThread(i, j, chunkstatus, flag); if (!completablefuture.isDone()) { // Paper // Paper start - async chunk io/loading + PlayerChunk playerChunk = this.getChunk(ChunkCoordIntPair.pair(x, z)); + if (playerChunk != null) { + playerChunk.markChunkUrgent(chunkstatus); + } this.world.asyncChunkTaskManager.raisePriority(x, z, com.destroystokyo.paper.io.PrioritizedTaskQueue.HIGHEST_PRIORITY); com.destroystokyo.paper.io.chunk.ChunkTaskManager.pushChunkWait(this.world, x, z); // Paper end @@ -478,6 +487,11 @@ public class ChunkProviderServer extends IChunkProvider { com.destroystokyo.paper.io.chunk.ChunkTaskManager.popChunkWait(); // Paper - async chunk debug this.world.timings.syncChunkLoad.stopTiming(); // Paper } // Paper + PlayerChunk playerChunk = this.getChunk(ChunkCoordIntPair.pair(x, z)); + if (playerChunk != null) { + playerChunk.clearChunkUrgent(); + } + IS_CHUNK_LOAD_BLOCKING_MAIN = prevBlocking;// Paper ichunkaccess = (IChunkAccess) ((Either) completablefuture.join()).map((ichunkaccess1) -> { return ichunkaccess1; }, (playerchunk_failure) -> { diff --git a/src/main/java/net/minecraft/server/PlayerChunk.java b/src/main/java/net/minecraft/server/PlayerChunk.java index 04b97cec29..568fbbd5f2 100644 --- a/src/main/java/net/minecraft/server/PlayerChunk.java +++ b/src/main/java/net/minecraft/server/PlayerChunk.java @@ -43,6 +43,111 @@ public class PlayerChunk { long lastAutoSaveTime; // Paper - incremental autosave long inactiveTimeStart; // Paper - incremental autosave + // Paper start - Chunk gen/load priority system + volatile int chunkPriority = 0; + volatile boolean isUrgent = false; + final java.util.List urgentNeighbors = new java.util.ArrayList<>(); + volatile PlayerChunk rootUrgentOriginator; + volatile PlayerChunk urgentOriginator; + public void onNeighborRequest(PlayerChunk neighbor, ChunkStatus status) { + if (isUrgent && !neighbor.isUrgent && !java.util.Objects.equals(neighbor, rootUrgentOriginator) && !java.util.Objects.equals(neighbor, urgentOriginator)) { + synchronized (this.urgentNeighbors) { + if (!neighbor.isUrgent) { + neighbor.markChunkUrgent(status, this.rootUrgentOriginator, this); + this.urgentNeighbors.add(neighbor); + } + } + } + } + + public void onNeighborsDone() { + List urgentNeighbors; + synchronized (this.urgentNeighbors) { + urgentNeighbors = new java.util.ArrayList<>(this.urgentNeighbors); + this.urgentNeighbors.clear(); + } + for (PlayerChunk urgentNeighbor : urgentNeighbors) { + if (urgentNeighbor != null) { + urgentNeighbor.clearChunkUrgent(this); + } + } + } + + public void clearChunkUrgent() { + clearChunkUrgent(this); + } + public void clearChunkUrgent(PlayerChunk requester) { + if (this.isUrgent && java.util.Objects.equals(requester, this.urgentOriginator)) { + this.isUrgent = false; + this.urgentOriginator = null; + this.rootUrgentOriginator = null; + this.onNeighborsDone(); + } + } + + public void markChunkUrgent(ChunkStatus targetStatus) { + this.markChunkUrgent(targetStatus, this , this); + } + public void markChunkUrgent(ChunkStatus targetStatus, PlayerChunk rootUrgentOriginator, PlayerChunk urgentOriginator) { + if (!this.isUrgent) { + this.rootUrgentOriginator = rootUrgentOriginator; + this.urgentOriginator = urgentOriginator; + this.isUrgent = true; + int x = location.x; + int z = location.z; + IChunkAccess chunk = getAvailableChunkNow(); + final ChunkStatus chunkCurrentStatus = chunk == null ? null : chunk.getChunkStatus(); + final ChunkStatus completedStatus = this.getChunkHolderStatus(); + final ChunkStatus nextStatus = getNextStatus(completedStatus != null ? completedStatus : ChunkStatus.EMPTY); + + if (chunkCurrentStatus == null || completedStatus == null) { + this.chunkMap.world.asyncChunkTaskManager.raisePriority(x, z, com.destroystokyo.paper.io.PrioritizedTaskQueue.HIGHEST_PRIORITY); + // next status is empty, empty has no neighbours needing loading + return; + } + + if (!targetStatus.isAtLeastStatus(nextStatus)) { + // we don't want a status greater-than the one we already have, don't prioritise these loads - they will get in the way + return; + } + + // at this point we want a chunk that has a status higher than the one we have already completed + + // does the next status need neighbours at all? + final int requiredNeighbours = nextStatus.getNeighborRadius(); + if (requiredNeighbours <= 0) { + // no it doesn't, we're done here. we've already prioritised this chunk, no neighbours need prioritising + return; + } + + // even though we might want a higher status than targetFinalStatus, we cannot queue neighbours for it - we + // instead use the current chunk status in progress (nextCompletedStatus) to ensure we aren't waiting on + // unprioritised logic for the next status to complete + + for (int cx = -requiredNeighbours; cx <= requiredNeighbours; ++cx) { + for (int cz = -requiredNeighbours; cz <= requiredNeighbours; ++cz) { + if (cx == 0 && cz == 0) { + continue; + } + PlayerChunk neighbor = this.chunkMap.getUpdatingChunk(ChunkCoordIntPair.asLong(x + cz, z + cx)); + if (neighbor == null) { + continue; + } + + IChunkAccess neighborChunk = neighbor.getAvailableChunkNow(); + ChunkStatus neededStatus = this.chunkMap.getNeededStatusByRadius(nextStatus, Math.max(Math.abs(cx), Math.abs(cz))); + ChunkStatus neighborCurrentStatus = neighborChunk != null ? neighborChunk.getChunkStatus() : ChunkStatus.EMPTY; + if (nextStatus == ChunkStatus.LIGHT || !neighborCurrentStatus.isAtLeastStatus(neededStatus)) { + // we don't need to gen neighbours if our current chunk's status has already gone through the gen + // light is always an exception, no matter what if we go through light we need its neighbours - the light engine requires them + this.onNeighborRequest(neighbor, neededStatus); + } + } + } + } + } + // Paper end + public PlayerChunk(ChunkCoordIntPair chunkcoordintpair, int i, LightEngine lightengine, PlayerChunk.c playerchunk_c, PlayerChunk.d playerchunk_d) { this.statusFutures = new AtomicReferenceArray(PlayerChunk.CHUNK_STATUSES.size()); this.fullChunkFuture = PlayerChunk.UNLOADED_CHUNK_FUTURE; @@ -139,6 +244,12 @@ public class PlayerChunk { } return null; } + public static ChunkStatus getNextStatus(ChunkStatus status) { + if (status == ChunkStatus.FULL) { + return status; + } + return CHUNK_STATUSES.get(status.getStatusIndex() + 1); + } // Paper end public CompletableFuture> getStatusFutureUnchecked(ChunkStatus chunkstatus) { @@ -354,7 +465,7 @@ public class PlayerChunk { } public int k() { - return this.n; + return Math.max(1, this.n - this.chunkPriority - (isUrgent ? 20 : 0)); // Paper - allow modifying priority, subtracts 20 if urgent } private void d(int i) { diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java index db5a35598d..22550f74df 100644 --- a/src/main/java/net/minecraft/server/PlayerChunkMap.java +++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java @@ -291,6 +291,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d { List>> list = Lists.newArrayList(); int j = chunkcoordintpair.x; int k = chunkcoordintpair.z; + PlayerChunk requestingNeighbor = this.requestingNeighbor; // Paper for (int l = -i; l <= i; ++l) { for (int i1 = -i; i1 <= i; ++i1) { @@ -308,6 +309,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d { } ChunkStatus chunkstatus = (ChunkStatus) intfunction.apply(j1); + if (requestingNeighbor != null) requestingNeighbor.onNeighborRequest(playerchunk, chunkstatus); // Paper CompletableFuture> completablefuture = playerchunk.a(chunkstatus, this); list.add(completablefuture); @@ -771,23 +773,28 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d { }; CompletableFuture chunkSaveFuture = this.world.asyncChunkTaskManager.getChunkSaveFuture(chunkcoordintpair.x, chunkcoordintpair.z); + PlayerChunk playerChunk = getUpdatingChunk(chunkcoordintpair.pair()); + boolean isBlockingMain = playerChunk != null && playerChunk.isUrgent; + int priority = isBlockingMain ? com.destroystokyo.paper.io.PrioritizedTaskQueue.HIGHEST_PRIORITY : com.destroystokyo.paper.io.PrioritizedTaskQueue.HIGH_PRIORITY; if (chunkSaveFuture != null) { - this.world.asyncChunkTaskManager.scheduleChunkLoad(chunkcoordintpair.x, chunkcoordintpair.z, - com.destroystokyo.paper.io.PrioritizedTaskQueue.HIGH_PRIORITY, chunkHolderConsumer, false, chunkSaveFuture); - this.world.asyncChunkTaskManager.raisePriority(chunkcoordintpair.x, chunkcoordintpair.z, com.destroystokyo.paper.io.PrioritizedTaskQueue.HIGH_PRIORITY); + this.world.asyncChunkTaskManager.scheduleChunkLoad(chunkcoordintpair.x, chunkcoordintpair.z, priority, chunkHolderConsumer, isBlockingMain, chunkSaveFuture); } else { - this.world.asyncChunkTaskManager.scheduleChunkLoad(chunkcoordintpair.x, chunkcoordintpair.z, - com.destroystokyo.paper.io.PrioritizedTaskQueue.NORMAL_PRIORITY, chunkHolderConsumer, false); + this.world.asyncChunkTaskManager.scheduleChunkLoad(chunkcoordintpair.x, chunkcoordintpair.z, priority, chunkHolderConsumer, isBlockingMain); } + this.world.asyncChunkTaskManager.raisePriority(chunkcoordintpair.x, chunkcoordintpair.z, priority); return ret; // Paper end } + private PlayerChunk requestingNeighbor; // Paper private CompletableFuture> b(PlayerChunk playerchunk, ChunkStatus chunkstatus) { ChunkCoordIntPair chunkcoordintpair = playerchunk.i(); + PlayerChunk prevNeighbor = requestingNeighbor; // Paper + this.requestingNeighbor = playerchunk; // Paper CompletableFuture, PlayerChunk.Failure>> completablefuture = this.a(chunkcoordintpair, chunkstatus.f(), (i) -> { return this.a(chunkstatus, i); }); + this.requestingNeighbor = prevNeighbor; // Paper this.world.getMethodProfiler().c(() -> { return "chunkGenerate " + chunkstatus.d(); @@ -815,6 +822,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d { return CompletableFuture.completedFuture(Either.right(playerchunk_failure)); }); }, (runnable) -> { + playerchunk.onNeighborsDone(); // Paper this.mailboxWorldGen.a(ChunkTaskQueueSorter.a(playerchunk, runnable)); // CraftBukkit - decompile error }); } @@ -827,6 +835,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d { })); } + public ChunkStatus getNeededStatusByRadius(ChunkStatus chunkstatus, int i) { return a(chunkstatus, i); } // Paper - OBFHELPER private ChunkStatus a(ChunkStatus chunkstatus, int i) { ChunkStatus chunkstatus1; @@ -951,9 +960,12 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d { public CompletableFuture> a(PlayerChunk playerchunk) { ChunkCoordIntPair chunkcoordintpair = playerchunk.i(); + PlayerChunk prevNeighbor = this.requestingNeighbor; // Paper + this.requestingNeighbor = playerchunk; // Paper CompletableFuture, PlayerChunk.Failure>> completablefuture = this.a(chunkcoordintpair, 1, (i) -> { return ChunkStatus.FULL; }); + this.requestingNeighbor = prevNeighbor; // Paper CompletableFuture> completablefuture1 = completablefuture.thenApplyAsync((either) -> { return either.flatMap((list) -> { Chunk chunk = (Chunk) list.get(list.size() / 2); -- 2.26.0