95 lines
4.9 KiB
Diff
95 lines
4.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Tue, 23 Oct 2018 23:14:38 -0400
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Subject: [PATCH] Improve Server Thread Pool and Thread Priorities
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Use a simple executor since Fork join is a much more complex pool
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type and we are not using its capabilities.
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Set thread priorities so main thread has above normal priority over
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server threads
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Allow usage of a single thread executor by not using ForkJoin so single core CPU's.
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== AT ==
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public net.minecraft.Util onThreadException(Ljava/lang/Thread;Ljava/lang/Throwable;)V
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diff --git a/src/main/java/io/papermc/paper/util/ServerWorkerThread.java b/src/main/java/io/papermc/paper/util/ServerWorkerThread.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..b60f59cf5cc8eb84a6055b7861857dece7f2501b
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/util/ServerWorkerThread.java
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@@ -0,0 +1,14 @@
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+package io.papermc.paper.util;
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+
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+import java.util.concurrent.atomic.AtomicInteger;
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+import net.minecraft.Util;
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+
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+public class ServerWorkerThread extends Thread {
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+ private static final AtomicInteger threadId = new AtomicInteger(1);
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+ public ServerWorkerThread(Runnable target, String poolName, int prioritityModifier) {
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+ super(target, "Worker-" + poolName + "-" + threadId.getAndIncrement());
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+ setPriority(Thread.NORM_PRIORITY+prioritityModifier); // Deprioritize over main
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+ this.setDaemon(true);
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+ this.setUncaughtExceptionHandler(Util::onThreadException);
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+ }
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+}
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diff --git a/src/main/java/net/minecraft/Util.java b/src/main/java/net/minecraft/Util.java
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index 336a26733b5bf73455f8ec10347c1e08b8e866f7..0773447354542925826369625f21e26aa30ebff4 100644
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--- a/src/main/java/net/minecraft/Util.java
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+++ b/src/main/java/net/minecraft/Util.java
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@@ -79,8 +79,8 @@ public class Util {
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private static final int DEFAULT_MAX_THREADS = 255;
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private static final String MAX_THREADS_SYSTEM_PROPERTY = "max.bg.threads";
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private static final AtomicInteger WORKER_COUNT = new AtomicInteger(1);
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- private static final ExecutorService BOOTSTRAP_EXECUTOR = makeExecutor("Bootstrap");
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- private static final ExecutorService BACKGROUND_EXECUTOR = makeExecutor("Main");
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+ private static final ExecutorService BOOTSTRAP_EXECUTOR = makeExecutor("Bootstrap", -2); // Paper - add -2 priority
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+ private static final ExecutorService BACKGROUND_EXECUTOR = makeExecutor("Main", -1); // Paper - add -1 priority
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// Paper start - don't submit BLOCKING PROFILE LOOKUPS to the world gen thread
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public static final ExecutorService PROFILE_EXECUTOR = Executors.newFixedThreadPool(2, new java.util.concurrent.ThreadFactory() {
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@@ -143,14 +143,18 @@ public class Util {
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return FILENAME_DATE_TIME_FORMATTER.format(ZonedDateTime.now());
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}
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- private static ExecutorService makeExecutor(String name) {
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- int i = Mth.clamp(Runtime.getRuntime().availableProcessors() - 1, 1, getMaxThreads());
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+ private static ExecutorService makeExecutor(String s, int priorityModifier) { // Paper - add priority
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+ // Paper start - use simpler thread pool that allows 1 thread
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+ int i = Math.min(8, Math.max(Runtime.getRuntime().availableProcessors() - 2, 1));
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+ i = Integer.getInteger("Paper.WorkerThreadCount", i);
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ExecutorService executorService;
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+
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if (i <= 0) {
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executorService = MoreExecutors.newDirectExecutorService();
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} else {
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- executorService = new ForkJoinPool(i, (forkJoinPool) -> {
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- ForkJoinWorkerThread forkJoinWorkerThread = new ForkJoinWorkerThread(forkJoinPool) {
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+ executorService = new java.util.concurrent.ThreadPoolExecutor(i, i,0L, TimeUnit.MILLISECONDS, new java.util.concurrent.LinkedBlockingQueue<Runnable>(), target -> new io.papermc.paper.util.ServerWorkerThread(target, s, priorityModifier));
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+ }
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+ /*
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@Override
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protected void onTermination(Throwable throwable) {
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if (throwable != null) {
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@@ -166,6 +170,7 @@ public class Util {
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return forkJoinWorkerThread;
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}, Util::onThreadException, true);
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}
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+ }*/ // Paper end
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return executorService;
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}
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index 25aac194eb486a5b8707aa0a655fd8259ad7409c..6afa9ab5cb864ff286341582d6d70648d8a86efb 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -306,6 +306,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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S s0 = serverFactory.apply(thread); // CraftBukkit - decompile error
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atomicreference.set(s0);
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+ thread.setPriority(Thread.NORM_PRIORITY+2); // Paper - boost priority
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thread.start();
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return s0;
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}
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