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 65e0ca442980f273d2fe5f131e174cd92f80da20..81f4f26a6b83079d36acd1fd86dede0eb1116c01 100644 --- a/src/main/java/net/minecraft/Util.java +++ b/src/main/java/net/minecraft/Util.java @@ -56,7 +56,7 @@ import java.util.stream.Stream; import javax.annotation.Nullable; import net.minecraft.resources.ResourceLocation; import net.minecraft.server.Bootstrap; -import net.minecraft.util.Mth; +import net.minecraft.server.ServerWorkerThread; import net.minecraft.util.datafix.DataFixers; import net.minecraft.world.level.block.state.properties.Property; import org.apache.commons.io.IOUtils; @@ -65,8 +65,8 @@ import org.apache.logging.log4j.Logger; public class Util { 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 UUID NIL_UUID = new UUID(0L, 0L); @@ -101,14 +101,18 @@ public class Util { return Instant.now().toEpochMilli(); } - private static ExecutorService makeExecutor(String name) { - int i = Mth.clamp(Runtime.getRuntime().availableProcessors() - 1, 1, 7); + 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 ServerWorkerThread(target, s, priorityModifier)); + } + /* @Override protected void onTermination(Throwable throwable) { if (throwable != null) { @@ -124,6 +128,7 @@ 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 00920e574ee1f104781d1f776d88ec9cd45eda93..a9f40f74cbd35533c6a334020c4f3ecd7ced3a43 100644 --- a/src/main/java/net/minecraft/server/MinecraftServer.java +++ b/src/main/java/net/minecraft/server/MinecraftServer.java @@ -317,6 +317,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop