2dd8623548
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
CraftBukkit Changes:
7033f180 Hoist out synchronisation from ChunkRegionLoader
Spigot Changes:
500ff5d4 Rebuild patches
Additional Paper changes:
Fixed Versioned World Folders to not synchronize on ChunkRegionLoader
Optimized Save Queue even more to use a Long2ObjectOpenHashmap for save map
Add World#getXIfLoaded to IWorldReader to expose it to more places
206 Zeilen
10 KiB
Diff
206 Zeilen
10 KiB
Diff
From 1f1de0e88a43b88331553bbd92b9dfedb6991c5a Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Fri, 4 Mar 2016 18:18:37 -0600
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Subject: [PATCH] Chunk save queue improvements
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For some unknown reason, Minecraft is sleeping 10ms between every single chunk being saved to disk.
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Under high chunk load/unload activity (lots of movement / teleporting), this causes the chunk unload queue
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to build up in size.
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This has multiple impacts:
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1) Performance of the unload queue itself - The save thread is pretty ineffecient for how it accesses it
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By letting the queue get larger, checking and popping work off the queue can get less performant.
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2) Performance of chunk loading - As with #1, chunk loads also have to check this queue when loading
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chunk data so that it doesn't load stale data if new data is pending write to disk.
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3) Memory Usage - The entire chunk has been serialized to NBT, and now sits in this queue. This leads to
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elevated memory usage, and then the objects used in the serialization sit around longer than needed,
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resulting in promotion to Old Generation instead of dying young.
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To optimize this, we change the entire unload queue to be a proper queue. This improves the behavior of popping
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the first queued chunk off, instead of abusing iterators like Mojang was doing.
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This also improves reliability of chunk saving, as the previous hack job had a race condition that could
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fail to save some chunks.
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Then finally, Sleeping will by default be removed, but due to known issues with 1.9, a config option was added.
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But if sleeps are to remain enabled, we at least lower the sleep interval so it doesn't have as much negative impact.
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diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
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index 0d68ffd75a..fd00c320ce 100644
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--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
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+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
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@@ -208,4 +208,10 @@ public class PaperConfig {
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private static void chunkLoadThreads() {
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minChunkLoadThreads = Math.min(6, getInt("settings.min-chunk-load-threads", 2)); // Keep people from doing stupid things with max of 6
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}
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+
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+ public static boolean enableFileIOThreadSleep;
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+ private static void enableFileIOThreadSleep() {
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+ enableFileIOThreadSleep = getBoolean("settings.sleep-between-chunk-saves", false);
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+ if (enableFileIOThreadSleep) Bukkit.getLogger().info("Enabled sleeping between chunk saves, beware of memory issues");
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+ }
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}
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diff --git a/src/main/java/net/minecraft/server/ChunkCoordIntPair.java b/src/main/java/net/minecraft/server/ChunkCoordIntPair.java
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index d9608121b6..d7a6700936 100644
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--- a/src/main/java/net/minecraft/server/ChunkCoordIntPair.java
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+++ b/src/main/java/net/minecraft/server/ChunkCoordIntPair.java
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@@ -19,6 +19,7 @@ public class ChunkCoordIntPair {
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this.z = (int)(i >> 32);
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}
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+ public long asLong() { return a(); } // Paper
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public long a() {
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return a(this.x, this.z);
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}
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diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
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index f969c036f3..e831ea1429 100644
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--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
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+++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
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@@ -22,6 +22,7 @@ import java.util.function.Consumer;
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import java.util.function.Function;
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import java.util.function.Predicate;
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import javax.annotation.Nullable;
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+import java.util.concurrent.ConcurrentLinkedQueue; // Paper
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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// Spigot start
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@@ -31,8 +32,28 @@ import org.spigotmc.SupplierUtils;
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public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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+ // Paper start - Chunk queue improvements
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+ private static class QueuedChunk {
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+ public ChunkCoordIntPair coords;
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+ public Supplier<NBTTagCompound> compoundSupplier;
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+ public Runnable onSave;
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+
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+ public QueuedChunk(Runnable run) {
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+ this.coords = null;
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+ this.compoundSupplier = null;
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+ this.onSave = run;
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+ }
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+
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+ public QueuedChunk(ChunkCoordIntPair coords, Supplier<NBTTagCompound> compoundSupplier) {
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+ this.coords = coords;
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+ this.compoundSupplier = compoundSupplier;
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+ }
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+ }
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+ final private ConcurrentLinkedQueue<QueuedChunk> queue = new ConcurrentLinkedQueue<>();
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+ // Paper end
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+
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private static final Logger a = LogManager.getLogger();
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- private final Map<ChunkCoordIntPair, Supplier<NBTTagCompound>> b = Maps.newHashMap();
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+ private final it.unimi.dsi.fastutil.longs.Long2ObjectMap<Supplier<NBTTagCompound>> saveMap = it.unimi.dsi.fastutil.longs.Long2ObjectMaps.synchronize(new it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap<>()); // Paper
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private final File c;
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private final DataFixer d;
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private PersistentStructureLegacy e;
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@@ -78,7 +99,7 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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@Nullable
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private NBTTagCompound a(DimensionManager dimensionmanager, @Nullable PersistentCollection persistentcollection, int i, int j, @Nullable GeneratorAccess generatoraccess) throws IOException {
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- NBTTagCompound nbttagcompound = SupplierUtils.getIfExists(this.b.get(new ChunkCoordIntPair(i, j))); // Spigot
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+ NBTTagCompound nbttagcompound = SupplierUtils.getIfExists(this.saveMap.get(ChunkCoordIntPair.asLong(i, j))); // Spigot // Paper
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if (nbttagcompound != null) {
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return nbttagcompound;
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@@ -306,7 +327,7 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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};
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}
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- this.a(chunkcoordintpair, SupplierUtils.createUnivaluedSupplier(completion, unloaded && this.b.size() < SAVE_QUEUE_TARGET_SIZE));
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+ this.a(chunkcoordintpair, SupplierUtils.createUnivaluedSupplier(completion, unloaded)); // Paper - Remove save queue target size
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// Spigot end
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} catch (Exception exception) {
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ChunkRegionLoader.a.error("Failed to save chunk", exception);
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@@ -315,7 +336,8 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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}
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protected void a(ChunkCoordIntPair chunkcoordintpair, Supplier<NBTTagCompound> nbttagcompound) { // Spigot
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- this.b.put(chunkcoordintpair, nbttagcompound);
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+ this.saveMap.put(chunkcoordintpair.asLong(), nbttagcompound); // Paper
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+ queue.add(new QueuedChunk(chunkcoordintpair, nbttagcompound)); // Paper - Chunk queue improvements
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FileIOThread.a().a(this);
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}
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@@ -325,19 +347,24 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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}
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private boolean processSaveQueueEntry(boolean logCompletion) {
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- Iterator iterator = this.b.entrySet().iterator();
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- if (!iterator.hasNext()) {
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+ // Paper start - Chunk queue improvements
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+ QueuedChunk chunk = queue.poll();
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+ if (chunk == null) {
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+ // Paper - end
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if (logCompletion) { // CraftBukkit
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ChunkRegionLoader.a.info("ThreadedAnvilChunkStorage ({}): All chunks are saved", this.c.getName());
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}
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return false;
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} else {
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- Entry entry = (Entry) iterator.next();
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-
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- iterator.remove();
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- ChunkCoordIntPair chunkcoordintpair = (ChunkCoordIntPair) entry.getKey();
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- Supplier<NBTTagCompound> nbttagcompound = (Supplier<NBTTagCompound>) entry.getValue(); // Spigot
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+ // Paper start
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+ if (chunk.onSave != null) {
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+ chunk.onSave.run();
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+ return true;
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+ }
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+ // Paper end
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+ ChunkCoordIntPair chunkcoordintpair = chunk.coords; // Paper - Chunk queue improvements
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+ Supplier<NBTTagCompound> nbttagcompound = chunk.compoundSupplier; // Spigot // Paper
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if (nbttagcompound == null) {
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return true;
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@@ -346,6 +373,15 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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// CraftBukkit start
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RegionFileCache.write(this.c, chunkcoordintpair.x, chunkcoordintpair.z, SupplierUtils.getIfExists(nbttagcompound)); // Spigot
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+ // Paper start remove from map only if this was the latest version of the chunk
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+ synchronized (this.saveMap) {
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+ long k = chunkcoordintpair.asLong();
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+ // This will not equal if a newer version is still pending - wait until newest is saved to remove
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+ if (this.saveMap.get(k) == chunk.compoundSupplier) {
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+ this.saveMap.remove(k);
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+ }
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+ }
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+ // Paper end
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/*
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NBTCompressedStreamTools.a(nbttagcompound, (DataOutput) dataoutputstream);
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dataoutputstream.close();
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diff --git a/src/main/java/net/minecraft/server/FileIOThread.java b/src/main/java/net/minecraft/server/FileIOThread.java
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index a3aba244af..97917551a4 100644
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--- a/src/main/java/net/minecraft/server/FileIOThread.java
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+++ b/src/main/java/net/minecraft/server/FileIOThread.java
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@@ -35,20 +35,21 @@ public class FileIOThread implements Runnable {
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for(int i = 0; i < this.c.size(); ++i) {
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IAsyncChunkSaver iasyncchunksaver = (IAsyncChunkSaver)this.c.get(i);
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boolean flag;
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- synchronized(iasyncchunksaver) {
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+ //synchronized(iasyncchunksaver) { // Paper - remove synchronized
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flag = iasyncchunksaver.a();
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- }
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+ //} // Paper
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if (!flag) {
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this.c.remove(i--);
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++this.e;
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}
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+ if (com.destroystokyo.paper.PaperConfig.enableFileIOThreadSleep) { // Paper
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try {
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- Thread.sleep(this.f ? 0L : 10L);
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+ Thread.sleep(this.f ? 0L : 1L); // Paper
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} catch (InterruptedException interruptedexception1) {
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interruptedexception1.printStackTrace();
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- }
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+ }} // Paper
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}
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if (this.c.isEmpty()) {
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--
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2.18.0
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