Paper/patches/server/0267-Improve-Server-Thread-Pool-and-Thread-Priorities.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 23 Oct 2018 23:14:38 -0400
Subject: [PATCH] Improve Server Thread Pool and Thread Priorities
Use a simple executor since Fork join is a much more complex pool
type and we are not using its capabilities.
Set thread priorities so main thread has above normal priority over
server threads
Allow usage of a single thread executor by not using ForkJoin so single core CPU's
and reduce worldgen thread worker count for low core count CPUs.
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== AT ==
public net.minecraft.Util onThreadException(Ljava/lang/Thread;Ljava/lang/Throwable;)V
Co-authored-by: Spottedleaf <Spottedleaf@users.noreply.github.com>
diff --git a/src/main/java/io/papermc/paper/util/ServerWorkerThread.java b/src/main/java/io/papermc/paper/util/ServerWorkerThread.java
new file mode 100644
index 0000000000000000000000000000000000000000..b60f59cf5cc8eb84a6055b7861857dece7f2501b
--- /dev/null
+++ b/src/main/java/io/papermc/paper/util/ServerWorkerThread.java
@@ -0,0 +1,14 @@
+package io.papermc.paper.util;
+
+import java.util.concurrent.atomic.AtomicInteger;
+import net.minecraft.Util;
+
+public class ServerWorkerThread extends Thread {
+ private static final AtomicInteger threadId = new AtomicInteger(1);
+ public ServerWorkerThread(Runnable target, String poolName, int prioritityModifier) {
+ super(target, "Worker-" + poolName + "-" + threadId.getAndIncrement());
+ setPriority(Thread.NORM_PRIORITY+prioritityModifier); // Deprioritize over main
+ this.setDaemon(true);
+ this.setUncaughtExceptionHandler(Util::onThreadException);
+ }
+}
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diff --git a/src/main/java/net/minecraft/Util.java b/src/main/java/net/minecraft/Util.java
index aa52b271bd556a29f774fde375b713d0d187521b..765e4bc00a0526aab6e263dae7233f63f7f31498 100644
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--- a/src/main/java/net/minecraft/Util.java
+++ b/src/main/java/net/minecraft/Util.java
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@@ -86,7 +86,7 @@ public class Util {
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private static final int DEFAULT_MAX_THREADS = 255;
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private static final int DEFAULT_SAFE_FILE_OPERATION_RETRIES = 10;
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private static final String MAX_THREADS_SYSTEM_PROPERTY = "max.bg.threads";
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- private static final ExecutorService BACKGROUND_EXECUTOR = makeExecutor("Main");
+ private static final ExecutorService BACKGROUND_EXECUTOR = makeExecutor("Main", -1); // Paper - Perf: add priority
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private static final ExecutorService IO_POOL = makeIoExecutor("IO-Worker-", false);
private static final ExecutorService DOWNLOAD_POOL = makeIoExecutor("Download-", true);
// Paper start - don't submit BLOCKING PROFILE LOOKUPS to the world gen thread
@@ -152,15 +152,27 @@ public class Util {
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return FILENAME_DATE_TIME_FORMATTER.format(ZonedDateTime.now());
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}
- private static ExecutorService makeExecutor(String name) {
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- int i = Mth.clamp(Runtime.getRuntime().availableProcessors() - 1, 1, getMaxThreads());
+ private static ExecutorService makeExecutor(String s, int priorityModifier) { // Paper - Perf: add priority
+ // Paper start - Perf: use simpler thread pool that allows 1 thread and reduce worldgen thread worker count for low core count CPUs
+ int cpus = Runtime.getRuntime().availableProcessors() / 2;
+ int i;
+ if (cpus <= 4) {
+ i = cpus <= 2 ? 1 : 2;
+ } else if (cpus <= 8) {
+ // [5, 8]
+ i = Math.max(3, cpus - 2);
+ } else {
+ i = cpus * 2 / 3;
+ }
+ i = Math.min(8, i);
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+ i = Integer.getInteger("Paper.WorkerThreadCount", i);
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ExecutorService executorService;
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if (i <= 0) {
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executorService = MoreExecutors.newDirectExecutorService();
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} else {
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- AtomicInteger atomicInteger = new AtomicInteger(1);
- executorService = new ForkJoinPool(i, (pool) -> {
- ForkJoinWorkerThread forkJoinWorkerThread = new ForkJoinWorkerThread(pool) {
+ executorService = new java.util.concurrent.ThreadPoolExecutor(i, i,0L, TimeUnit.MILLISECONDS, new java.util.concurrent.LinkedBlockingQueue<>(), target -> new io.papermc.paper.util.ServerWorkerThread(target, s, priorityModifier));
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+ }
+ /*
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@Override
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protected void onTermination(Throwable throwable) {
if (throwable != null) {
@@ -176,6 +188,7 @@ public class Util {
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return forkJoinWorkerThread;
}, Util::onThreadException, true);
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}
+ }*/ // Paper end - Perf: use simpler thread pool
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return executorService;
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}
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
Updated Upstream (Bukkit/CraftBukkit) (#10242) * Updated Upstream (Bukkit/CraftBukkit) Upstream has released updates that appear to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: a6a9d2a4 Remove some old ApiStatus.Experimental annotations be72314c SPIGOT-7300, PR-829: Add new DamageSource API providing enhanced information about entity damage b252cf05 SPIGOT-7576, PR-970: Add methods in MushroomCow to change stew effects b1c689bd PR-902: Add Server#isLoggingIPs to get log-ips configuration 08f86d1c PR-971: Add Player methods for client-side potion effects 2e3024a9 PR-963: Add API for in-world structures a23292a7 SPIGOT-7530, PR-948: Improve Resource Pack API with new 1.20.3 functionality 1851857b SPIGOT-3071, PR-969: Add entity spawn method with spawn reason cde4c52a SPIGOT-5553, PR-964: Add EntityKnockbackEvent CraftBukkit Changes: 38fd4bd50 Fix accidentally renamed internal damage method 80f0ce4be SPIGOT-7300, PR-1180: Add new DamageSource API providing enhanced information about entity damage 7e43f3b16 SPIGOT-7581: Fix typo in BlockMushroom ea14b7d90 SPIGOT-7576, PR-1347: Add methods in MushroomCow to change stew effects 4c687f243 PR-1259: Add Server#isLoggingIPs to get log-ips configuration 22a541a29 Improve support for per-world game rules cb7dccce2 PR-1348: Add Player methods for client-side potion effects b8d6109f0 PR-1335: Add API for in-world structures 4398a1b5b SPIGOT-7577: Make CraftWindCharge#explode discard the entity e74107678 Fix Crafter maximum stack size 0bb0f4f6a SPIGOT-7530, PR-1314: Improve Resource Pack API with new 1.20.3 functionality 4949f556d SPIGOT-3071, PR-1345: Add entity spawn method with spawn reason 20ac73ca2 PR-1353: Fix Structure#place not working as documented with 0 palette 3c1b77871 SPIGOT-6911, PR-1349: Change max book length in CraftMetaBook 333701839 SPIGOT-7572: Bee nests generated without bees f48f4174c SPIGOT-5553, PR-1336: Add EntityKnockbackEvent
2024-02-11 22:28:00 +01:00
index 0b704d5d39263b66f7846a9c4a116ac4d96383cf..114f40c63c617f4df9e6c9bf2d50707e289f2f20 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -312,6 +312,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
thread.setUncaughtExceptionHandler((thread1, throwable) -> {
MinecraftServer.LOGGER.error("Uncaught exception in server thread", throwable);
});
+ thread.setPriority(Thread.NORM_PRIORITY+2); // Paper - Perf: Boost priority
if (Runtime.getRuntime().availableProcessors() > 4) {
thread.setPriority(8);
}