174 lines
8.1 KiB
Diff
174 lines
8.1 KiB
Diff
From 4cc6be534b490919b4e2bff32bf93121d92f6c6c 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 e55ff98..2a391d5 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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@@ -169,4 +169,10 @@ public class PaperConfig {
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public 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/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
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index 5bd6ce0..336e780 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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@@ -11,14 +11,17 @@ import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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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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public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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+ private ConcurrentLinkedQueue<QueuedChunk> queue = new ConcurrentLinkedQueue<QueuedChunk>(); // Paper - Chunk queue improvements
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+ private final Object lock = new Object(); // Paper - Chunk queue improvements
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private static final Logger a = LogManager.getLogger();
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private Map<ChunkCoordIntPair, NBTTagCompound> b = new ConcurrentHashMap();
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- private Set<ChunkCoordIntPair> c = Collections.newSetFromMap(new ConcurrentHashMap());
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+ //private Set<ChunkCoordIntPair> c = Collections.newSetFromMap(new ConcurrentHashMap()); // Paper - Chunk queue improvements
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private final File d;
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private final DataConverterManager e;
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private boolean f = false;
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@@ -32,11 +35,11 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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public boolean chunkExists(World world, int i, int j) {
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ChunkCoordIntPair chunkcoordintpair = new ChunkCoordIntPair(i, j);
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- if (this.c.contains(chunkcoordintpair)) {
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+ //if (this.c.contains(chunkcoordintpair)) { // Paper - Chunk queue improvements
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if (this.b.containsKey(chunkcoordintpair)) {
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return true;
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}
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- }
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+ //} // Paper - Chunk queue improvements
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// Paper start - Don't create region files when checking that they exist
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final RegionFile region = RegionFileCache.a(this.d, i, j, false);
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@@ -139,28 +142,32 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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}
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protected void a(ChunkCoordIntPair chunkcoordintpair, NBTTagCompound nbttagcompound) {
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- if (!this.c.contains(chunkcoordintpair)) {
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+ synchronized (lock) { // Paper - Chunk queue improvements
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this.b.put(chunkcoordintpair, nbttagcompound);
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}
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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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public boolean c() {
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- if (this.b.isEmpty()) {
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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 (this.f) {
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ChunkRegionLoader.a.info("ThreadedAnvilChunkStorage ({}): All chunks are saved", new Object[] { this.d.getName()});
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}
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return false;
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} else {
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- ChunkCoordIntPair chunkcoordintpair = (ChunkCoordIntPair) this.b.keySet().iterator().next();
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+ ChunkCoordIntPair chunkcoordintpair = chunk.coords; // Paper - Chunk queue improvements
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boolean flag;
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try {
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- this.c.add(chunkcoordintpair);
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- NBTTagCompound nbttagcompound = (NBTTagCompound) this.b.remove(chunkcoordintpair);
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+ //this.c.add(chunkcoordintpair);
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+ NBTTagCompound nbttagcompound = chunk.compound; // Paper - Chunk queue improvements
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if (nbttagcompound != null) {
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try {
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@@ -169,10 +176,11 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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ChunkRegionLoader.a.error("Failed to save chunk", exception);
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}
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}
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+ synchronized (lock) { if (this.b.get(chunkcoordintpair) == nbttagcompound) { this.b.remove(chunkcoordintpair); } }// Paper - This will not equal if a newer version is still pending
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flag = true;
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} finally {
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- this.c.remove(chunkcoordintpair);
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+ //this.c.remove(chunkcoordintpair); // Paper
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}
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return flag;
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@@ -503,4 +511,16 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
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return entity;
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}
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}
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+
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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 NBTTagCompound compound;
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+
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+ public QueuedChunk(ChunkCoordIntPair coords, NBTTagCompound compound) {
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+ this.coords = coords;
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+ this.compound = compound;
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+ }
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+ }
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+ // Paper end
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}
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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 4733f94..113aea2 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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@@ -39,11 +39,15 @@ public class FileIOThread implements Runnable {
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++this.d;
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}
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- try {
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- Thread.sleep(this.e ? 0L : 10L);
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- } catch (InterruptedException interruptedexception) {
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- interruptedexception.printStackTrace();
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+ // Paper start - Add toggle
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+ if (com.destroystokyo.paper.PaperConfig.enableFileIOThreadSleep) {
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+ try {
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+ Thread.sleep(this.e ? 0L : 2L);
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+ } catch (InterruptedException interruptedexception) {
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+ interruptedexception.printStackTrace();
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+ }
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}
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+ // Paper end
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}
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if (this.b.isEmpty()) {
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--
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2.7.4
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