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Improve Server Thread Pool and Thread Priorities

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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.

== AT ==
public net.minecraft.Util onThreadException(Ljava/lang/Thread;Ljava/lang/Throwable;)V

Co-authored-by: Spottedleaf <Spottedleaf@users.noreply.github.com>
This commit is contained in:
Aikar
2018-10-23 23:14:38 -04:00
parent 539f1ba018
commit 9902ba8869
3 changed files with 129 additions and 52 deletions
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61
paper-server/patches/sources/net/minecraft/Util.java.patch
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@@ -1,7 +1,11 @@
--- a/net/minecraft/Util.java
+++ b/net/minecraft/Util.java
@@ -95,6 +95,22 @@
private static final TracingExecutor BACKGROUND_EXECUTOR = makeExecutor("Main");
@@ -92,9 +92,25 @@
private static final int DEFAULT_MAX_THREADS = 255;
private static final int DEFAULT_SAFE_FILE_OPERATION_RETRIES = 10;
private static final String MAX_THREADS_SYSTEM_PROPERTY = "max.bg.threads";
- private static final TracingExecutor BACKGROUND_EXECUTOR = makeExecutor("Main");
+ private static final TracingExecutor BACKGROUND_EXECUTOR = makeExecutor("Main", -1); // Paper - Perf: add priority
private static final TracingExecutor IO_POOL = makeIoExecutor("IO-Worker-", false);
private static final TracingExecutor DOWNLOAD_POOL = makeIoExecutor("Download-", true);
+ // Paper start - don't submit BLOCKING PROFILE LOOKUPS to the world gen thread
@@ -32,7 +36,58 @@
}
public static long getEpochMillis() {
@@ -537,7 +553,7 @@
@@ -147,15 +163,16 @@
return FILENAME_DATE_TIME_FORMATTER.format(ZonedDateTime.now());
}
- private static TracingExecutor makeExecutor(String name) {
+ private static TracingExecutor makeExecutor(String name, final int priorityModifier) { // Paper - Perf: add priority
int i = maxAllowedExecutorThreads();
- ExecutorService executorService;
+ // Paper start - Perf: use simpler thread pool that allows 1 thread and reduce worldgen thread worker count for low core count CPUs
+ final ExecutorService executorService;
if (i <= 0) {
executorService = MoreExecutors.newDirectExecutorService();
} else {
- AtomicInteger atomicInteger = new AtomicInteger(1);
- executorService = new ForkJoinPool(i, pool -> {
- final String string2 = "Worker-" + name + "-" + atomicInteger.getAndIncrement();
+ executorService = Executors.newFixedThreadPool(i, target -> new io.papermc.paper.util.ServerWorkerThread(target, name, priorityModifier));
+ }
+ /* final String string2 = "Worker-" + name + "-" + atomicInteger.getAndIncrement();
ForkJoinWorkerThread forkJoinWorkerThread = new ForkJoinWorkerThread(pool) {
@Override
protected void onStart() {
@@ -177,13 +194,26 @@
forkJoinWorkerThread.setName(string2);
return forkJoinWorkerThread;
}, Util::onThreadException, true);
- }
+ }*/
return new TracingExecutor(executorService);
}
public static int maxAllowedExecutorThreads() {
- return Mth.clamp(Runtime.getRuntime().availableProcessors() - 1, 1, getMaxThreads());
+ // Paper start - Perf: use simpler thread pool that allows 1 thread and reduce worldgen thread worker count for low core count CPUs
+ final int cpus = Runtime.getRuntime().availableProcessors() / 2;
+ int maxExecutorThreads;
+ if (cpus <= 4) {
+ maxExecutorThreads = cpus <= 2 ? 1 : 2;
+ } else if (cpus <= 8) {
+ // [5, 8]
+ maxExecutorThreads = Math.max(3, cpus - 2);
+ } else {
+ maxExecutorThreads = cpus * 2 / 3;
+ }
+ maxExecutorThreads = Math.min(8, maxExecutorThreads);
+ return Integer.getInteger("Paper.WorkerThreadCount", maxExecutorThreads);
+ // Paper end - Perf: use simpler thread pool that allows 1 thread and reduce worldgen thread worker count for low core count CPUs
}
private static int getMaxThreads() {
@@ -537,7 +567,7 @@
public static <K extends Enum<K>, V> EnumMap<K, V> makeEnumMap(Class<K> enumClass, Function<K, V> mapper) {
EnumMap<K, V> enumMap = new EnumMap<>(enumClass);