From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar 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. diff --git a/src/main/java/net/minecraft/Util.java b/src/main/java/net/minecraft/Util.java index d7e22ddf89619b58516ccef1d75a4c33df61b73c..70b8b86ed827217e536e35a690160adf9e974bb5 100644 --- a/src/main/java/net/minecraft/Util.java +++ b/src/main/java/net/minecraft/Util.java @@ -78,8 +78,8 @@ public class Util { private static final int DEFAULT_MAX_THREADS = 255; private static final String MAX_THREADS_SYSTEM_PROPERTY = "max.bg.threads"; private static final AtomicInteger WORKER_COUNT = new AtomicInteger(1); - private static final ExecutorService BOOTSTRAP_EXECUTOR = makeExecutor("Bootstrap"); - private static final ExecutorService BACKGROUND_EXECUTOR = makeExecutor("Main"); + private static final ExecutorService BOOTSTRAP_EXECUTOR = makeExecutor("Bootstrap", -2); // Paper - add -2 priority + private static final ExecutorService BACKGROUND_EXECUTOR = makeExecutor("Main", -1); // Paper - add -1 priority private static final ExecutorService IO_POOL = makeIoExecutor(); public static LongSupplier timeSource = System::nanoTime; public static final Ticker TICKER = new Ticker() { @@ -121,14 +121,18 @@ public class Util { return Instant.now().toEpochMilli(); } - private static ExecutorService makeExecutor(String name) { - int i = Mth.clamp(Runtime.getRuntime().availableProcessors() - 1, 1, getMaxThreads()); + private static ExecutorService makeExecutor(String s, int priorityModifier) { // Paper - add priority + // Paper start - use simpler thread pool that allows 1 thread + int i = Math.min(8, Math.max(Runtime.getRuntime().availableProcessors() - 2, 1)); + i = Integer.getInteger("Paper.WorkerThreadCount", i); ExecutorService executorService; + if (i <= 0) { executorService = MoreExecutors.newDirectExecutorService(); } else { - executorService = new ForkJoinPool(i, (forkJoinPool) -> { - ForkJoinWorkerThread forkJoinWorkerThread = new ForkJoinWorkerThread(forkJoinPool) { + executorService = new java.util.concurrent.ThreadPoolExecutor(i, i,0L, TimeUnit.MILLISECONDS, new java.util.concurrent.LinkedBlockingQueue(), target -> new net.minecraft.server.ServerWorkerThread(target, s, priorityModifier)); + } + /* @Override protected void onTermination(Throwable throwable) { if (throwable != null) { @@ -144,6 +148,7 @@ public class Util { return forkJoinWorkerThread; }, Util::onThreadException, true); } + }*/ // Paper end return executorService; } diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java index 2ad76722a54d4cc1a4f4799d14d0148c86e93198..7af89d152b13870a8495f94dffd34c948a9148fa 100644 --- a/src/main/java/net/minecraft/server/MinecraftServer.java +++ b/src/main/java/net/minecraft/server/MinecraftServer.java @@ -303,6 +303,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop