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https://github.com/PaperMC/Paper.git
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We still keep vanilla process of waiting for existing session to be removed before logging in by storing a separate map of pending. also fire the callback using executor incase further recursion causes any trouble
276 lines
15 KiB
Diff
276 lines
15 KiB
Diff
From ce1db781f0616e0667f80d3395381026b1107547 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Wed, 8 Apr 2020 03:06:30 -0400
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Subject: [PATCH] Optimize PlayerChunkMap memory use for visibleChunks
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No longer clones visible chunks which is causing massive memory
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allocation issues, likely the source of Humongous Objects on large servers.
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Instead we just synchronize, clear and rebuild, reusing the same object buffers
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as before with only 2 small objects created (FastIterator/MapEntry)
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This should result in siginificant memory use reduction and improved GC behavior.
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diff --git a/src/main/java/com/destroystokyo/paper/util/map/Long2ObjectLinkedOpenHashMapFastCopy.java b/src/main/java/com/destroystokyo/paper/util/map/Long2ObjectLinkedOpenHashMapFastCopy.java
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new file mode 100644
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index 0000000000..e0ad725b2e
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/util/map/Long2ObjectLinkedOpenHashMapFastCopy.java
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@@ -0,0 +1,32 @@
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+package com.destroystokyo.paper.util.map;
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+
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+import it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap;
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+
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+public class Long2ObjectLinkedOpenHashMapFastCopy<V> extends Long2ObjectLinkedOpenHashMap<V> {
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+
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+ public void copyFrom(Long2ObjectLinkedOpenHashMapFastCopy<V> map) {
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+ if (key.length < map.key.length) {
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+ key = null;
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+ key = new long[map.key.length];
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+ }
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+ if (value.length < map.value.length) {
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+ value = null;
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+ //noinspection unchecked
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+ value = (V[]) new Object[map.value.length];
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+ }
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+ if (link.length < map.link.length) {
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+ link = null;
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+ link = new long[map.link.length];
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+ }
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+ System.arraycopy(map.key, 0, this.key, 0, map.key.length);
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+ System.arraycopy(map.value, 0, this.value, 0, map.value.length);
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+ System.arraycopy(map.link, 0, this.link, 0, map.link.length);
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+ this.size = map.size;
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+ this.mask = map.mask;
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+ this.first = map.first;
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+ this.last = map.last;
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+ this.n = map.n;
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+ this.maxFill = map.maxFill;
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+ this.containsNullKey = map.containsNullKey;
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+ }
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+}
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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 2e63f64783..3d79e756d9 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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@@ -750,7 +750,7 @@ 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.f().forEach((playerchunk) -> {
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+ 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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diff --git a/src/main/java/net/minecraft/server/MCUtil.java b/src/main/java/net/minecraft/server/MCUtil.java
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index d9941b38ca..71ab65e00f 100644
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--- a/src/main/java/net/minecraft/server/MCUtil.java
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+++ b/src/main/java/net/minecraft/server/MCUtil.java
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@@ -529,7 +529,7 @@ public final class MCUtil {
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WorldServer world = ((org.bukkit.craftbukkit.CraftWorld)bukkitWorld).getHandle();
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PlayerChunkMap chunkMap = world.getChunkProvider().playerChunkMap;
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- Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks = chunkMap.visibleChunks;
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+ Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks = chunkMap.getVisibleChunks();
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ChunkMapDistance chunkMapDistance = chunkMap.getChunkMapDistanceManager();
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List<PlayerChunk> allChunks = new ArrayList<>(visibleChunks.values());
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List<EntityPlayer> players = world.players;
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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 e1e4ea793a..e61ddeb1ff 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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@@ -55,8 +55,10 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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private static final Logger LOGGER = LogManager.getLogger();
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public static final int GOLDEN_TICKET = 33 + ChunkStatus.b();
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- public final Long2ObjectLinkedOpenHashMap<PlayerChunk> updatingChunks = new Long2ObjectLinkedOpenHashMap();
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- public volatile Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks;
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+ public final com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> updatingChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<>(); // Paper - faster copying
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+ public final com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> visibleChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<>(); // Paper - faster copying
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+ public final com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> pendingVisibleChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<>(); // Paper - this is used if the visible chunks is updated while iterating only
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+ public transient Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunksClone; // Paper - used for async access of visible chunks, clone and cache only when needed
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private final Long2ObjectLinkedOpenHashMap<PlayerChunk> pendingUnload;
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final LongSet loadedChunks; // Paper - private -> package
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public final WorldServer world;
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@@ -170,7 +172,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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public PlayerChunkMap(WorldServer worldserver, File file, DataFixer datafixer, DefinedStructureManager definedstructuremanager, Executor executor, IAsyncTaskHandler<Runnable> iasynctaskhandler, ILightAccess ilightaccess, ChunkGenerator<?> chunkgenerator, WorldLoadListener worldloadlistener, Supplier<WorldPersistentData> supplier, int i) {
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super(new File(worldserver.getWorldProvider().getDimensionManager().a(file), "region"), datafixer);
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- this.visibleChunks = this.updatingChunks.clone();
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+ //this.visibleChunks = this.updatingChunks.clone(); // Paper - no more cloning
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this.pendingUnload = new Long2ObjectLinkedOpenHashMap();
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this.loadedChunks = new LongOpenHashSet();
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this.unloadQueue = new LongOpenHashSet();
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@@ -262,9 +264,52 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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return (PlayerChunk) this.updatingChunks.get(i);
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}
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+ // Paper start - remove cloning of visible chunks unless accessed as a collection async
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+ private static final boolean DEBUG_ASYNC_VISIBLE_CHUNKS = Boolean.getBoolean("paper.debug-async-visible-chunks");
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+ private boolean isIterating = false;
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+ private boolean hasPendingVisibleUpdate = false;
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+ public void forEachVisibleChunk(java.util.function.Consumer<PlayerChunk> consumer) {
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+ org.spigotmc.AsyncCatcher.catchOp("forEachVisibleChunk");
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+ boolean prev = isIterating;
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+ isIterating = true;
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+ try {
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+ for (PlayerChunk value : this.visibleChunks.values()) {
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+ consumer.accept(value);
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+ }
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+ } finally {
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+ this.isIterating = prev;
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+ if (!this.isIterating && this.hasPendingVisibleUpdate) {
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+ this.visibleChunks.copyFrom(this.pendingVisibleChunks);
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+ this.pendingVisibleChunks.clear();
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+ this.hasPendingVisibleUpdate = false;
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+ }
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+ }
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+ }
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+ public Long2ObjectLinkedOpenHashMap<PlayerChunk> getVisibleChunks() {
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+ if (Thread.currentThread() == this.world.serverThread) {
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+ return this.visibleChunks;
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+ } else {
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+ synchronized (this.visibleChunks) {
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+ if (DEBUG_ASYNC_VISIBLE_CHUNKS) new Throwable("Async getVisibleChunks").printStackTrace();
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+ if (this.visibleChunksClone == null) {
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+ this.visibleChunksClone = this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.clone() : this.visibleChunks.clone();
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+ }
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+ return this.visibleChunksClone;
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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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@Nullable
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public PlayerChunk getVisibleChunk(long i) { // Paper - protected -> public
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- return (PlayerChunk) this.visibleChunks.get(i);
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+ // Paper start - mt safe get
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+ if (Thread.currentThread() != this.world.serverThread) {
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+ synchronized (this.visibleChunks) {
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+ return (PlayerChunk) (this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.get(i) : this.visibleChunks.get(i));
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+ }
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+ }
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+ return (PlayerChunk) (this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.get(i) : this.visibleChunks.get(i));
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+ // Paper end
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}
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protected IntSupplier c(long i) {
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@@ -444,8 +489,9 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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// Paper end
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protected void save(boolean flag) {
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+ Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks = this.getVisibleChunks(); // Paper remove clone of visible Chunks unless saving off main thread (watchdog kill)
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if (flag) {
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- List<PlayerChunk> list = (List) this.visibleChunks.values().stream().filter(PlayerChunk::hasBeenLoaded).peek(PlayerChunk::m).collect(Collectors.toList());
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+ List<PlayerChunk> list = (List) visibleChunks.values().stream().filter(PlayerChunk::hasBeenLoaded).peek(PlayerChunk::m).collect(Collectors.toList()); // Paper - remove cloning of visible chunks
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MutableBoolean mutableboolean = new MutableBoolean();
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do {
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@@ -473,7 +519,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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// this.i(); // Paper - nuke IOWorker
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PlayerChunkMap.LOGGER.info("ThreadedAnvilChunkStorage ({}): All chunks are saved", this.w.getName());
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} else {
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- this.visibleChunks.values().stream().filter(PlayerChunk::hasBeenLoaded).forEach((playerchunk) -> {
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+ visibleChunks.values().stream().filter(PlayerChunk::hasBeenLoaded).forEach((playerchunk) -> {
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IChunkAccess ichunkaccess = (IChunkAccess) playerchunk.getChunkSave().getNow(null); // CraftBukkit - decompile error
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if (ichunkaccess instanceof ProtoChunkExtension || ichunkaccess instanceof Chunk) {
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@@ -643,7 +689,20 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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if (!this.updatingChunksModified) {
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return false;
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} else {
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- this.visibleChunks = this.updatingChunks.clone();
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+ // Paper start - stop cloning visibleChunks
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+ synchronized (this.visibleChunks) {
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+ if (isIterating) {
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+ hasPendingVisibleUpdate = true;
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+ this.pendingVisibleChunks.copyFrom(this.updatingChunks);
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+ } else {
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+ hasPendingVisibleUpdate = false;
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+ this.pendingVisibleChunks.clear();
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+ this.visibleChunks.copyFrom(this.updatingChunks);
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+ this.visibleChunksClone = null;
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+ }
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+ }
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+ // Paper end
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+
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this.updatingChunksModified = false;
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return true;
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}
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@@ -1104,12 +1163,12 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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}
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protected Iterable<PlayerChunk> f() {
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- return Iterables.unmodifiableIterable(this.visibleChunks.values());
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+ return Iterables.unmodifiableIterable(this.getVisibleChunks().values()); // Paper
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}
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void a(Writer writer) throws IOException {
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CSVWriter csvwriter = CSVWriter.a().a("x").a("z").a("level").a("in_memory").a("status").a("full_status").a("accessible_ready").a("ticking_ready").a("entity_ticking_ready").a("ticket").a("spawning").a("entity_count").a("block_entity_count").a(writer);
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- ObjectBidirectionalIterator objectbidirectionaliterator = this.visibleChunks.long2ObjectEntrySet().iterator();
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+ ObjectBidirectionalIterator objectbidirectionaliterator = this.getVisibleChunks().long2ObjectEntrySet().iterator(); // Paper
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while (objectbidirectionaliterator.hasNext()) {
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Entry<PlayerChunk> entry = (Entry) objectbidirectionaliterator.next();
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
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index 051506fce8..630d6470a4 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
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@@ -74,6 +74,7 @@ import net.minecraft.server.GameRules;
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import net.minecraft.server.GroupDataEntity;
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import net.minecraft.server.IBlockData;
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import net.minecraft.server.IChunkAccess;
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+import net.minecraft.server.MCUtil;
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import net.minecraft.server.MinecraftKey;
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import net.minecraft.server.MovingObjectPosition;
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import net.minecraft.server.PacketPlayOutCustomSoundEffect;
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@@ -290,6 +291,7 @@ public class CraftWorld implements World {
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return ret;
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}
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public int getTileEntityCount() {
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+ return MCUtil.ensureMain(() -> {
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// We don't use the full world tile entity list, so we must iterate chunks
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Long2ObjectLinkedOpenHashMap<PlayerChunk> chunks = world.getChunkProvider().playerChunkMap.visibleChunks;
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int size = 0;
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@@ -301,11 +303,13 @@ public class CraftWorld implements World {
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size += chunk.tileEntities.size();
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}
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return size;
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+ });
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}
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public int getTickableTileEntityCount() {
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return world.tileEntityListTick.size();
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}
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public int getChunkCount() {
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+ return MCUtil.ensureMain(() -> {
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int ret = 0;
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for (PlayerChunk chunkHolder : world.getChunkProvider().playerChunkMap.visibleChunks.values()) {
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@@ -314,7 +318,7 @@ public class CraftWorld implements World {
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}
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}
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- return ret;
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+ return ret; });
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}
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public int getPlayerCount() {
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return world.players.size();
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@@ -432,6 +436,14 @@ public class CraftWorld implements World {
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@Override
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public Chunk[] getLoadedChunks() {
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+ // Paper start
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+ if (Thread.currentThread() != world.getMinecraftWorld().serverThread) {
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+ synchronized (world.getChunkProvider().playerChunkMap.visibleChunks) {
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+ Long2ObjectLinkedOpenHashMap<PlayerChunk> chunks = world.getChunkProvider().playerChunkMap.visibleChunks;
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+ return chunks.values().stream().map(PlayerChunk::getFullChunk).filter(Objects::nonNull).map(net.minecraft.server.Chunk::getBukkitChunk).toArray(Chunk[]::new);
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+ }
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+ }
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+ // Paper end
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Long2ObjectLinkedOpenHashMap<PlayerChunk> chunks = world.getChunkProvider().playerChunkMap.visibleChunks;
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return chunks.values().stream().map(PlayerChunk::getFullChunk).filter(Objects::nonNull).map(net.minecraft.server.Chunk::getBukkitChunk).toArray(Chunk[]::new);
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}
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--
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2.25.1
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